WO2022048185A1 - 风力发电系统及其控制方法和装置 - Google Patents

风力发电系统及其控制方法和装置 Download PDF

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Publication number
WO2022048185A1
WO2022048185A1 PCT/CN2021/093614 CN2021093614W WO2022048185A1 WO 2022048185 A1 WO2022048185 A1 WO 2022048185A1 CN 2021093614 W CN2021093614 W CN 2021093614W WO 2022048185 A1 WO2022048185 A1 WO 2022048185A1
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WIPO (PCT)
Prior art keywords
power
coil windings
power conversion
sets
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/093614
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English (en)
French (fr)
Inventor
张鲁华
马成斌
刘嘉明
陈昆明
俞庆
葛昊祥
吕霆
吴延俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Electric Wind Power Group Co Ltd
Original Assignee
Shanghai Electric Wind Power Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Electric Wind Power Group Co Ltd filed Critical Shanghai Electric Wind Power Group Co Ltd
Priority to EP21863255.2A priority Critical patent/EP4209676A4/en
Priority to KR1020237011410A priority patent/KR102897527B1/ko
Publication of WO2022048185A1 publication Critical patent/WO2022048185A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04—Automatic control; Regulation
    • F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0272—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor by measures acting on the electrical generator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
    • F03D7/0284—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to the state of the electric grid
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2101/00—Supply or distribution of decentralised, dispersed or local electric power generation
    • H02J2101/20—Dispersed power generation using renewable energy sources
    • H02J2101/28—Wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Definitions

  • the present application relates to the field of wind power generation, and in particular, to a wind power generation system and a control method and device thereof.
  • the wind power generation system has gradually developed into the parallel operation control mode of the current dual PWM (Pulse width modulation) back-to-back system.
  • This method has stable operation and high circuit reliability, and has been effectively applied in wind power generation systems.
  • the wind power generation system includes multiple power conversion circuits.
  • the power will be evenly distributed to each set of coil windings of the motor.
  • the aging of components will accelerate and affect the electrical life of the components, and when the power is small, each converter is in a low-power operation state, and the THDi (Total Harmonic Current Distortion) of the grid-connected current is too large, making the The overall efficiency of the motor and converter is low, which affects the power generation and power quality.
  • the present application provides an improved wind power generation system and a control method and device thereof.
  • An embodiment of the present application provides a control method for a wind power generation system, wherein the wind power generation system includes a motor and N sets of power conversion circuits, the motor includes N sets of coil windings, and is electrically connected to the N sets of the power conversion circuits correspondingly , N is a positive integer not less than 2, and the control method includes: acquiring the operating power of the motor; controlling the cut-in of the coil windings according to the current operating power of the motor; if the current operating power of the motor is lower than The rated power of a single set of the coil windings, control one of the N sets of the coil windings to cut in; if the current operating power of the motor is higher than the rated power of a single set of the coil windings, control one of the N sets of the coil windings. At least two sets of said coil windings are cut in.
  • controlling at least two sets of the coil windings in the N sets to switch in includes: judging the current running power of the motor. Whether the power is higher than the sum of the rated powers of the n sets of the coil windings, and lower than the sum of the rated powers of the n+1 sets of the coil windings; The n sets of the coil windings in the +1 set output full power, and the remaining set of the coil windings in the n+1 sets output the first residual power, and the first residual power is the current operating power of the motor The difference between n times the full power, n is greater than 1 and less than N.
  • controlling at least two sets of the coil windings in the N sets to switch in including: if the current running power of the motor is The power increases the rated power of at least one set of said coil windings, and controls at least one set of said coil windings to switch in; if the current operating power of said motor reduces the rated power of at least one set of said coil windings, controls at least one set of said coil windings.
  • the coil windings are cut out.
  • the cut-out sequence of the coil windings is the same as the cut-in sequence of the coil windings.
  • the N sets of coil windings include k sets of coil windings in a standby state
  • the controlling at least one set of the coil windings to switch in includes: according to each set of the coil windings in the k sets of coil windings.
  • the standby time of the k-th set of coil windings is controlled to be switched in, wherein if the standby time of the k-th set of coil windings is greater than the standby time of the k-1-th set of coil windings, the k-th set of coil windings is controlled to be earlier than the k-th set of coil windings.
  • the k-1 set of coil windings is cut in, and k is greater than 1 and smaller than N.
  • the power conversion circuit includes a machine-side switch, a machine-side converter, a grid-side converter, and a grid-side switch, and the machine-side switch is electrically connected between the machine-side converter and the motor.
  • the grid-side switch is electrically connected between the grid-side converter and the grid;
  • the controlling at least one set of the coil windings to switch in includes: sequentially controlling the grid-side switch to close, the grid-side converter The current converter is modulated, the machine-side switch is closed, and the machine-side converter is modulated.
  • the N sets of coil windings include t sets of coil windings in a running state
  • the controlling at least one set of the coil windings to cut out includes: according to each set of the coil windings in the t sets of coil windings.
  • the running time of the windings controls the cut-out of the coil windings, wherein if the running time of the t-th set of coil windings is greater than the running time of the t-1-th set of coil windings, the t-th set of coil windings is controlled Cut in before the t-1th set of coil windings. where t is greater than 1 and less than N.
  • the power conversion circuit includes a machine-side switch, a machine-side converter, a grid-side converter, and a grid-side switch, and the machine-side switch is electrically connected between the machine-side converter and the motor.
  • the grid-side switch is electrically connected between the grid-side converter and the grid; the controlling at least one set of the coil windings to be cut out includes: sequentially controlling the machine-side converter to end modulation, and The machine-side switch is turned off, the grid-side converter ends modulation, and the grid-side switch is turned off.
  • At least one set of the power conversion circuits includes M power conversion modules that are electrically connected to the same set of the coil windings, the M power conversion modules are connected in parallel, and M is a positive integer not less than 2; the The control method further includes: controlling the switching in of the power conversion module according to the output power of the coil winding. Wherein, if the output power of the coil winding is lower than the rated power of a single power conversion module, control one of the M power conversion modules to perform modulation, and control the other power conversion modules to stop modulation; The output power of the coil winding is higher than the rated power of a single power conversion module, at least two of the M power conversion modules are controlled to perform modulation, and other power conversion modules are controlled to stop modulation.
  • controlling at least two of the M power conversion modules to perform modulation includes: judging the coil winding. Whether the current output power is higher than the rated power of m power conversion modules, and not higher than the sum of the rated power of m+1 power conversion modules; if so, control m+1 power conversion modules Perform modulation, wherein m of the m+1 power conversion modules are controlled to output rated power, and the remaining one of m+1 of the power conversion modules is controlled to output a second residual power, and the second residual power is the The difference between the current output power of the coil winding and m times the rated power. where m is greater than 1 and less than M.
  • controlling at least two of the M power conversion modules to perform modulation including: if the coil winding The output power of at least one of the power conversion modules is increased, and at least one of the power conversion modules is controlled to switch in and modulate; if the output power of the coil winding is reduced by the rated power of at least one of the power conversion modules, control At least one of the power conversion modules switches out and ends modulation.
  • the switching-out sequence of the power conversion module is the same as the switching-in sequence of the power conversion module.
  • the M power conversion modules include i power conversion modules in a standby state
  • the controlling at least one power conversion module to switch in includes: according to each of the i power conversion modules.
  • the standby time of the power conversion module controls the switching of the power conversion module, wherein if the standby time of the i-th power conversion module is greater than the standby time of the i-1-th power conversion module, the control The i-th power conversion module switches in before the i-1-th power conversion module. where i is greater than 1 and less than M.
  • the M power conversion modules include j power conversion modules in a running state
  • the controlling at least one of the power conversion modules to switch out includes: according to each of the j power conversion modules.
  • the operation time of the power conversion module is controlled for each of the power conversion modules, and if the operation time of the jth power conversion module is greater than the operation time of the j-1th power conversion module, then The j-th power conversion module is controlled to switch in before the j-1-th power conversion module.
  • j is greater than 1 and less than M.
  • the present application also provides a computer-readable storage medium on which a computer program is stored, wherein when the program is executed by a processor, the control method of any one of the above-mentioned wind power generation systems is implemented.
  • the present application also provides a control device for a wind power generation system, which includes one or more processors for implementing the control method for a wind power generation system described in any one of the above.
  • the present application also provides a wind power generation system, which includes: a motor including N sets of coil windings, where N is a positive integer not less than 2; N sets of power conversion circuits, which are electrically connected to the N sets of the coil windings; and the above In the control device of the wind power generation system, the control device is electrically connected to the power conversion circuit.
  • the cut-in of the coil windings is controlled according to the current operating power of the motor.
  • the cut-in of one set of the coil windings is controlled.
  • At rated power at least two sets of coil windings are controlled to switch in and out.
  • Fig. 1 shows the structural schematic diagram of the wind power generation system of the present application
  • FIG. 2 is a schematic circuit diagram of the wind power generation system shown in FIG. 1;
  • Fig. 3 is a flow chart showing an embodiment of the control method of the wind power generation system shown in Fig. 2;
  • FIG. 4 is a flowchart of an embodiment of step S13 of the control method of the wind power generation system shown in FIG. 3;
  • Fig. 5 is a flowchart of another embodiment of step S13 of the control method of the wind power generation system shown in Fig. 3;
  • Fig. 6 is a flow chart showing another embodiment of the control method of the wind power generation system shown in Fig. 3;
  • FIG. 7 is a flowchart of an embodiment of step S21 of the control method for the wind power generation system shown in FIG. 6;
  • FIG. 8 is a flowchart of another embodiment of step S21 of the control method for the wind power generation system shown in FIG. 6;
  • FIG. 9 is a schematic diagram of an embodiment of a control device for a power conversion circuit of a wind power generation system of the present application.
  • FIG. 10 is a schematic diagram of an embodiment of the wind power generation system of the present application.
  • FIG. 1 is a schematic structural diagram of a wind power generation system 100 of the present application.
  • the wind power generation system 100 includes a tower 102 extending from a support surface 101 , a nacelle 103 mounted on the tower 102 , and a rotor 104 assembled to the nacelle 103 .
  • Rotor 104 includes a rotatable hub 1040 and at least one rotor blade 1041 connected to and extending outwardly from hub 1040 .
  • the rotor 104 includes three rotor blades 1041 .
  • rotor 104 may include more or fewer rotor blades.
  • a plurality of rotor blades 1041 may be spaced about the hub 1040 to facilitate rotating the rotor 104 to enable conversion of wind energy into usable mechanical energy, and subsequently into electrical energy.
  • an electric machine (not shown) is provided within the nacelle 103 , and the electric machine (not shown) may be connected to the rotor 104 for generating electrical power from the mechanical energy generated by the rotor 104 .
  • a control device (not shown) is also provided within the nacelle 103, and the control device (not shown) is communicatively connected to the electrical components of the wind power generation system 100 in order to control the operation of such components.
  • the control device (not shown) may also be located within any other component of the wind power system 100 , or at a location external to the wind power system 100 .
  • the control device (not shown) may comprise a computer or other processing unit.
  • control device may include suitable computer-readable instructions that, when executed, configure the control device (not shown) to perform various functions, such as, Control signals of the wind power generation system 100 are received, transmitted and/or executed.
  • a control device may be configured to control various operating modes (eg, start-up or shutdown sequences) of wind power generation system 100 and/or control various components of wind power generation system 100 .
  • FIG. 2 is a schematic circuit diagram of the wind power generation system 100 shown in FIG. 1 .
  • the wind power generation system 100 includes a motor 105 and N sets of power conversion circuits 106 connected to the motor 105, where N is a positive integer not less than 2.
  • the motor 105 may comprise an asynchronous motor or a synchronous motor.
  • the power conversion circuit 106 can receive the electrical signal output by the motor 105, convert the electrical signal and output the electrical signal.
  • the power conversion circuit 106 can convert the alternating current signal into a direct current signal, and then convert it into a power frequency alternating current output.
  • the motor 105 includes N sets of coil windings (not shown), the N sets of power conversion circuits 106 are correspondingly electrically connected to the N sets of coil windings, and the N sets of power conversion circuits 106 are used to receive the power output from the N sets of coil windings. signal, and convert the electrical signal to output.
  • the wind power generation system 100 includes a control device 107 connected to the power conversion circuit 106 for controlling the power conversion circuit 106 to convert the electrical signal output by the motor 105 .
  • the wind power generation system 100 includes a transformer 108 connected to the power conversion circuit 106 , the transformer 108 being electrically connected to the grid 109 .
  • the converted electrical signal output by the power conversion circuit 106 can be boosted by the transformer 108 and then sent to the grid 109 .
  • the power conversion circuit 106 includes a machine-side converter 110 and a grid-side converter 111 and a DC bus 112 connected between the machine-side converter 110 and the grid-side converter 111 .
  • the machine-side converter 110 is connected to the motor 105
  • the grid-side converter 111 is connected to the transformer 108
  • the machine-side converter 110 is connected to the grid-side converter 111 .
  • the machine-side converter 110 includes a rectifier
  • the grid-side converter 111 includes an inverter.
  • the electrical signal output by the motor 105 is an AC signal
  • the machine-side converter 110 is used to convert the electrical signal output by the motor 105 into a DC signal
  • the grid-side converter 111 is used to convert the DC signal into a converted output electrical signal
  • the converted output electrical signal is output to the transformer 108 .
  • the control device 107 may include a machine-side control device 113 and a grid-side control device 114.
  • the machine-side control device 113 is connected to the machine-side converter 110 for controlling the machine-side converter 110 to convert the electrical signal output by the motor 105 into a direct current signal.
  • the grid-side control device 114 is connected to the grid-side converter 111 for controlling the grid-side converter 111 to convert the direct current signal into a converted output electrical signal.
  • the machine-side control device 113 can control the voltage and/or power of the converted direct current signal
  • the grid-side control device 114 can control the voltage and/or power of the converted output electrical signal.
  • the machine-side control device 113 and the grid-side control device 114 may include any suitable programmable circuits or devices, such as a digital signal processor (Digital Signal Processor, DSP), a Field Programmable Gate Array (Field Programmable Gate Array, FPGA), a programmable Programmable Logic Controller (PLC) and Application Special Integrated Circuit (ASIC), etc.
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • PLC programmable Programmable Logic Controller
  • ASIC Application Special Integrated Circuit
  • the machine-side converter 110 includes a plurality of power switch tubes, and the machine-side controller 113 makes the machine-side converter 110 perform modulation by controlling the opening and closing states of the plurality of power switch tubes.
  • the machine-side controller 113 controls a plurality of power switch tubes to keep the off state at the same time, so that the machine-side converter 110 ends the modulation.
  • the modulation here refers to that the machine-side converter 110 adopts SVPWM (SPace Vector Pulse Width Modulation, space vector pulse width modulation) or SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) and other modulation methods by controlling the power switch according to Programmable logic on or off.
  • the power conversion circuit 106 further includes a machine-side switch 115 , which is electrically connected between the machine-side converter 110 and the motor 105 to control the connection between the machine-side converter 110 and the motor 105 . or disconnect.
  • the grid-side converter 111 includes a plurality of power switch tubes, and the grid-side controller 114 controls the modulation state of the grid-side converter 111 by controlling the opening and closing states of the plurality of power switch tubes. In some embodiments, the grid-side controller 114 controls the opening and closing states of a plurality of power switch tubes, so that the grid-side converter 111 performs modulation. In some embodiments, the grid-side controller 114 controls a plurality of power switch tubes to keep disconnected at the same time, so that the grid-side converter 111 ends the modulation.
  • modulation refers to that the machine-side converter 110 adopts a modulation method such as SVPWM (SPace Vector Pulse Width Modulation, space vector pulse width modulation) or SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation). Control the power switch to turn on or off according to the logic set by the program.
  • SVPWM Packet Control Pulse Width Modulation, space vector pulse width modulation
  • SPWM Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation
  • the power conversion circuit 106 further includes a grid-side switch 116 , which is electrically connected between the grid-side converter 111 and the grid 109 to control the connection between the grid-side converter 111 and the grid 109 . or disconnect.
  • FIG. 2 shows the machine-side controller 113 and the grid-side controller 114 electrically connected to one set of power conversion circuits 106 for the purpose of illustration only. Other sets of power conversion circuits 106 are also electrically connected to the organic-side controller and the grid-side controller 114 .
  • the grid-side controller which is also similar to the machine-side controller 113 and the grid-side controller 114 , is not shown in FIG. 2 and will not be repeated here.
  • FIG. 3 is a flowchart of an embodiment of the control method of the wind power generation system 100 shown in FIG. 2 . As shown in FIG. 3 , the control method of the wind power generation system 100 includes steps S10-S11.
  • Step S10 obtaining the current operating power of the motor
  • the current operating power of the motor can be obtained through the control device.
  • the control device may comprise any suitable programmable circuit or device, such as a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a programmable logic control Programmable Logic Controller (PLC) and Application Special Integrated Circuit (ASIC), etc., can realize the acquisition of the current operating power of the motor through the combination of software and hardware.
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • PLC programmable logic control Programmable Logic Controller
  • ASIC Application Special Integrated Circuit
  • Step S11 control the cut-in of the coil winding according to the current operating power of the motor.
  • step S11 includes steps S12-S13. Wherein, in step S12, if the current operating power of the motor is lower than the rated power of the single set of coil windings, control one set of the coil windings in the N sets to switch in.
  • the rated power of a single set of coil windings is P n
  • the obtained current operating power of the motor is P1
  • the motor has N sets of coil windings
  • the power conversion circuit has N sets.
  • Step S13 if the current operating power of the motor is higher than the rated power of the single set of coil windings, control at least two sets of coil windings in the N sets to switch in.
  • the rated power of a single set of coil windings is P n
  • the obtained current operating power of the motor is P1
  • the motor has N sets of coil windings
  • the power conversion circuit has N sets.
  • the embodiments of the present application optimize the number of cut-in coil windings according to the current operating power of the motor. Aging, prolonging the overall life; when the motor is in low-power operation, reduce the number of coil windings to cut in, so that part of the coil windings can be cut in, which can effectively improve the overall conversion efficiency, reduce grid-connected current harmonics, and improve power quality .
  • FIG. 4 is a flowchart of an embodiment of step S13 of the control method of the wind power generation system 100 shown in FIG. 3 . As shown in FIG. 4 , step S13 of the control method of the wind power generation system 100 includes steps S131-S132.
  • Step S131 judging whether the current operating power of the motor is higher than the sum of the rated powers of n sets of coil windings, and is lower than the sum of the rated powers of n+1 sets of coil windings;
  • Step S132 if yes, control n+1 sets of coil windings to switch in, wherein n sets of coil windings in the n+1 sets are controlled to output full power, and the remaining set of coil windings in the n+1 sets are controlled to output the first residual power,
  • the first residual power is the difference between the current running power of the motor and n times the full power; wherein, n is greater than 1 and less than N.
  • the rated power of a single set of coil windings is P n
  • the obtained current operating power of the motor is P1
  • the motor has N sets of coil windings
  • the power conversion circuit has N sets.
  • the power conversion circuit electrically connected to the two sets of coil windings is controlled to perform modulation, so that the two sets of coil windings are switched in, and the output of one set of coil windings is maintained. Full power, and the remaining set of coil windings output the remaining power.
  • the power conversion circuit electrically connected to the three sets of coil windings is controlled to perform modulation, so that the three sets of coil windings are switched in, and two sets of coil windings are maintained.
  • the winding outputs full power, and the remaining set of coil windings outputs the remaining power.
  • the embodiments of the present application optimize the number of cut-in coil windings according to the current operating power of the motor. In some cases, it is not necessary to cut in all the coil windings, and part of the coil windings can be cut in, which can slow down components such as coil windings.
  • FIG. 5 is a flowchart of another embodiment of step S13 of the control method of the wind power generation system 100 shown in FIG. 3 . As shown in FIG. 5 , step S13 of the control method of the wind power generation system 100 further includes steps S133-S134.
  • Step S133 if the current operating power of the motor increases the rated power of at least one set of coil windings, control at least one set of coil windings to switch in.
  • the switching in of the coil windings may be controlled according to the magnitude of the current operating power increase.
  • the current running power of the motor is increased by a magnitude greater than or equal to the rated power of one set of coil windings, control at least one set of coil windings to switch in.
  • the rated power of the single set of coil windings is P n
  • the obtained current operating power of the motor is P1
  • the amplitude of the increase of the current operating power P1 of the motor is equal to the rated power P n of the single set of coil windings, Controls the cut-in of one of the coil windings.
  • the current operating power P1 of the motor increases by more than the rated power P n of a single set of coil windings
  • two or more sets of coil windings are controlled to switch in, and according to the current operating power of the motor, the power of the coil windings is optimized. Cut in quantity to improve operating efficiency.
  • the switching-in sequence of the coil windings can be controlled according to the standby time of the coil windings in the standby state.
  • the standby state here refers to the state that the coil winding is cut out and is not working
  • the standby time here refers to the total time that the coil winding is in the standby state in a certain operating cycle of the fan.
  • the running cycle may be the entire running process, or may be a set running cycle.
  • the N sets of coil windings include k sets of coil windings in a standby state, and the cut-in of the coil windings is controlled according to the standby time of each set of coil windings in the k sets of coil windings.
  • the standby time of the k-1 set of coil windings is controlled to be switched in before the k-1 set of coil windings, where k is greater than 1 and less than N.
  • the coil winding with a long standby time is preferentially switched in.
  • the N sets of coil windings include k sets of coil windings in a standby state, wherein the standby time of the first set to the kth set of coil windings decreases sequentially.
  • the standby time of the first set of coil windings is longer than that of the first set of coil windings
  • the standby time of the two sets of coil windings, and so on, among the first to k-th sets of coil windings, the standby time of the first set of coil windings is relatively long, so the first set of coil windings with longer standby time is prioritized. Priority should be given to the coil windings with long standby time, so that each set of coil windings work in a balanced manner and prolong the service life of each set of coil windings.
  • controlling the switch-in sequence of the coil winding includes sequentially controlling the grid-side switch to close, the grid-side converter to modulate, the machine-side switch to close, and the machine-side converter to modulate. For example, when the coil winding needs to be cut in, first pre-charge the DC bus, then close the grid-side switch, then control the grid-side converter to modulate, then close the machine-side switch, and then control the machine-side converter to modulate to increase the power.
  • Step S134 if the current running power of the motor reduces the rated power of at least one set of coil windings, control at least one set of coil windings to cut out.
  • the cut-out of the coil windings may be controlled according to the magnitude of the current operating power reduction.
  • the current operating power of the motor is reduced by a magnitude greater than or equal to the rated power of one set of coil windings, at least one set of coil windings is controlled to be cut out.
  • the rated power of the single set of coil windings is P n
  • the acquired current operating power of the motor is P1
  • the magnitude of the reduction of the current operating power P1 of the motor is equal to the rated power of the single set of coil windings, control one of the Set the coil windings cut out.
  • two or more sets of coil windings are controlled to be cut out.
  • the order in which the coil windings are switched out is the same as the order in which the coil windings are switched in.
  • the current operating power of the motor increases, multiple coil windings are switched in in sequence, the power of the coil winding that is switched in first increases and the power is full first, and the coil winding that is switched in last outputs the remaining power.
  • the current operating power of the motor is reduced, the power of the coil winding that is switched in first is reduced and switched out first, thereby balancing the running time of the coil winding and improving the overall life.
  • the cutting-out sequence of the coil windings can be controlled according to the running time of the coil windings in the operating state.
  • the running state refers to the state in which the coil windings are switched to work
  • the running time refers to the sum of the time that the coil windings are in the running state in a certain running cycle.
  • the running cycle may be the entire running process or a certain set running cycle.
  • the N sets of coil windings include t sets of coil windings in the running state, and the cut-out of the coil windings is controlled according to the running time of each set of coil windings in the k sets of coil windings, wherein, if the running time of the t-th set of coil windings If it is greater than the running time of the t-1 set of coil windings, control the t-th set of coil windings to cut in before the t-1 set of coil windings; where t is greater than 1 and less than N.
  • the coil winding with a long running time is preferentially cut out.
  • the running time of the first set to the t set of coil windings decreases sequentially, and in this process, the running time of the first set of coil windings is greater than that of the first set of coil windings.
  • the running time of the two sets of coil windings, and so on, among the first to t sets of coil windings, the running time of the first set of coil windings is relatively long.
  • the first set of coil windings with a long running time should be cut out first.
  • Priority is given to cutting out the coil windings with a longer running time, which can slow down the aging of each set of coil windings and other components, so that multiple sets of coil windings work in a balanced manner and improve the overall service life.
  • the running time in order to avoid being in the running state all the time, the running time needs to be considered, and when it needs to be cut out, the long running time is cut out first, so as to avoid the rapid aging of some coil windings and other components As a result, the overall life of the motor is short, thus extending the overall life.
  • the standby time in order to avoid being in the standby state all the time, the standby time needs to be considered, and when switching in is required, the longer standby time is switched in first, so as to avoid a part of the coil windings in the running state all the time.
  • controlling the cut-out sequence of the coil winding includes sequentially controlling the machine-side converter to end modulation, the machine-side switch to be turned off, the grid-side converter to end modulation, and the grid-side switch to be turned off. For example, when the coil winding needs to be cut out, first control the machine-side converter to stop modulation, then turn off the machine-side switch, then control the grid-side converter to stop modulation, and then turn off the grid-side switch to reduce the power.
  • the rated power of a single set of coil windings is P n
  • the acquired current operating power of the motor is P1
  • the motor has N sets of coil windings
  • the power conversion circuit has N sets
  • the N sets of coil windings include the first set of coils Winding to the Nth set of coil windings.
  • the standby time from the first set of coil windings to the Nth set of coil windings decreases sequentially.
  • the windings output power to the outside.
  • priority is given to switching in the coil winding with a longer standby time.
  • the current operating power P1 of the motor increases from lower than Pn to Pn ⁇ P1 ⁇ 2Pn , because the standby time of the second set of coil windings is compared between the second set of coil windings to the Nth set of coil windings Therefore, it is preferred to switch to the second set of coil windings with longer standby time.
  • the first set of coil windings are controlled to be fully powered, and the second set of coil windings are controlled to switch to power generation; in the same way, the current operating power P1 of the motor continues.
  • the current operating power of the motor is P1 liters
  • it is as high as (N-1)P n ⁇ P1 ⁇ NP n
  • control the Nth set of coil windings to cut in power generation; when the current operating power P1 of the motor increases to P1 NP n , control each set of coil windings at this time Both output full power.
  • the operating time from the first set of coil windings to the Nth set of coil windings increases sequentially, when the current operating power P1 of the motor decreases and the magnitude of the reduced power is greater than or equal to the rated power Pn of the set of coil windings , the priority is to cut out the coil windings with longer running time.
  • each set of coil windings is controlled to start and stop in turn, which can well balance the cut-in and cut-out of each set of coil windings.
  • priority should be given to cutting out coil windings with a relatively long running time, which can slow down the aging of various sets of coil windings and other components and prolong the overall life of the motor.
  • the above is only an example, but when the current operating power P1 of the motor increases, it is not limited to decrease when it increases to the maximum value, and when the current operating power P1 of the motor decreases, it is not limited to It can be increased only when it is reduced to the minimum value.
  • the increase and decrease of the current operating power of the motor are determined by the actual operation of the fan.
  • the cut-in and cut-out of each set of coil windings is completed smoothly, which can make the force change of the motor relatively gentle, and reduce the vibration caused by the cut-in and cut-out of the coil windings.
  • the smooth completion here refers to that the power change of the motor gradually increases or decreases, rather than abruptly increases or decreases, which will not be repeated here.
  • FIG. 6 is a flowchart of still another embodiment of the control method of the wind power generation system 100 shown in FIG. 3 .
  • at least one set of power conversion circuits includes M power conversion modules electrically connected to the same set of coil windings, the M power conversion modules are connected in parallel, and M is a positive integer not less than 2; as shown in FIG. 6 .
  • the control method of the wind power generation system 100 further includes step S20 .
  • the embodiment shown in FIG. 6 is to control M power conversion modules of each power conversion circuit.
  • Step S20 controlling the switch-in of the power conversion module according to the output power of the coil winding.
  • step S20 includes steps S21-S22, wherein, in step S21, if the output power of the coil winding is lower than the rated power of a single power conversion module, control one of the M power conversion modules to perform modulation, and control other power conversion modules. The module stops modulating.
  • Step S22 if the output power of the coil winding is higher than the rated power of a single power conversion module, control at least two of the M power conversion modules to perform modulation, and control other power conversion modules to stop modulation.
  • the rated power of a single power conversion module is P m
  • the acquired current output power of the coil winding is P2
  • the current output power P2 of the coil winding is less than the rated power P m of a single power conversion module
  • one of the power conversion modules is controlled to switch in and perform modulation, and the other power conversion modules are switched out.
  • the electrical energy output by the coil winding is converted.
  • Other power conversion modules are in a non-working state, which can slow down the aging of components such as the power conversion module and prolong the overall life.
  • the current output power P2 of the coil winding is greater than the rated power P m of a single power conversion module
  • two or more power conversion modules are controlled to switch in and perform modulation, and further, the output power of the coil winding is obtained by acquiring the output power of the coil winding. Control the cut-in and modulation of each power conversion module, so that the control process is more refined, the power conversion effect is more accurate, and it is convenient to improve the quality of grid-connected power.
  • FIG. 7 is a flowchart of an embodiment of step S21 of the control method of the wind power generation system 100 shown in FIG. 6 .
  • step S21 of the control method of the wind power generation system 100 includes steps S211-S212.
  • Step S211 judging whether the current output power of the coil winding is higher than the rated power of the m power conversion modules, and is not higher than the sum of the rated powers of the m+1 power conversion modules;
  • Step S212 if yes, control m+1 power conversion modules to perform modulation, wherein m+1 power conversion modules in m+1 are controlled to output rated power, and the remaining one power conversion module in m+1 is controlled to output the second remaining power.
  • Power, the second residual power is the difference between the current output power of the coil winding and m times the rated power; where m is greater than 1 and less than M.
  • the rated power of a single power conversion module is P m
  • the acquired current output power of the coil winding is P2, and there are M power conversion modules.
  • the current output power P2 of the coil winding is P m ⁇ P2 ⁇ 2P m
  • two power conversion modules are switched in and modulated, while m-2 power conversion modules are controlled to be switched out.
  • one power conversion module outputs the rated power
  • the remaining one power conversion module outputs the remaining power.
  • the current output power P2 of the coil winding increases to 2Pm ⁇ P2 ⁇ 3Pm
  • three power conversion modules are switched in and modulated, while m-3 power conversion modules are controlled to be switched out.
  • two power conversion modules output the rated power, and the remaining one power conversion module outputs the remaining power.
  • the current output power P2 of the coil winding increases to mP m ⁇ P2 ⁇ (m+1) P m
  • m+1 power conversion modules are switched in and modulated, and m power conversion modules are controlled to be switched out.
  • m power conversion modules output rated power
  • the remaining one power conversion module outputs the remaining power.
  • m+1 power conversion modules are switched in and modulated, and at this time, m+1 power conversion modules all output full power.
  • the embodiments of the present application optimize the number of power conversion modules switched in according to the current operating power of the coil windings.
  • the aging of power conversion modules and other components prolongs the overall life, and when the coil windings are running at low power, more precise control of the cut-in of each power conversion module can improve the quality of grid-connected power and reduce the harmonic content.
  • Fig. 8 is a flowchart of another embodiment of step S21 of the control method of the wind power generation system 100 shown in Fig. 6 .
  • step S21 of the control method of the wind power generation system 100 includes steps S213-S214.
  • Step S213 if the output power of the coil winding increases the rated power of the at least one power conversion module, control the at least one power conversion module to switch in and perform modulation.
  • the cut-in of the power conversion module may be controlled according to the magnitude of the increase in the output power. In some embodiments, when the magnitude of the increase in the output power of the coil winding is greater than or equal to the rated power of one power conversion module, the at least one power conversion module is controlled to switch in and perform modulation.
  • the rated power of a single power conversion module is P m
  • the acquired current output power of the coil winding is P2, and there are M power conversion modules.
  • the current output power of the coil winding is increased by an amplitude equal to the rated power of a single power conversion module, one of the power conversion modules is controlled to switch in.
  • the power conversion module when the current output power of the coil winding is increased by a magnitude greater than the rated power of a single power conversion module, two or more power conversion modules are controlled to switch in, and the power conversion module is optimized according to the output power of the coil winding The number of cut-ins makes the conversion efficiency more accurate and the power quality better.
  • the switching sequence of the power conversion module can be controlled according to the standby time of the power conversion module in the standby state.
  • the standby state here refers to the state in which the power conversion module is switched out and is not working
  • the standby time here refers to the total time that the power conversion module is in the standby state in the entire running process.
  • the M power conversion modules include i power conversion modules in a standby state, and controlling at least one power conversion module to switch in includes, according to the standby time of each of the i power conversion modules, controlling the power conversion module Switch in, wherein, if the standby time of the i-th power conversion module is greater than the standby time of the i-1-th power conversion module, the i-th power conversion module is controlled to switch in before the i-1-th power conversion module; where, i greater than 1 and less than M.
  • the power conversion module with a long standby time is preferentially switched to.
  • the M power conversion modules include i power conversion modules in a standby state, wherein the standby time of the first to i-th power conversion modules decreases sequentially. The standby time is longer than the standby time of the second power conversion module, and so on.
  • the standby time of the first power conversion module is relatively long. Therefore, priority should be given to switching to the standby time comparison. Long 1st power conversion module.
  • Priority is given to switching on the power conversion module with a relatively long standby time, so that each power conversion module can work in a balanced manner and prolong the service life of each power conversion module.
  • the cut-in of each power conversion module is optimized, and the more precise control can effectively improve the efficiency of power conversion and reduce the harmonic content in the power grid, thereby improving the quality of grid-connected power.
  • Step S214 if the output power of the coil winding reduces the rated power of the at least one power conversion module, control the at least one power conversion module to switch out and end the modulation.
  • the cut-out of the power conversion module may be controlled according to the magnitude of the reduction of the output power. In some embodiments, when the magnitude of the reduction in the output power of the coil winding is greater than or equal to the rated power of one power conversion module, the at least one power conversion module is controlled to switch out and end the modulation.
  • the rated power of a single power conversion module is P m
  • the acquired current output power of the coil winding is P2
  • the current output power of the coil winding is reduced by a magnitude equal to the rated power of a single power conversion module
  • one of the power conversion modules is controlled to switch out and end the modulation.
  • the magnitude of reduction is greater than the rated power of a single power conversion module, and at this time, two or more power conversion modules are controlled to switch out.
  • the power conversion modules are switched out in the same order as the power conversion modules are switched in. For a plurality of power conversion modules that are switched in in sequence, the power conversion module that is switched in first is switched out first, so as to balance the running time of the power conversion modules and improve the overall lifespan.
  • the switching-out sequence of the power conversion modules may be controlled according to the running time of the power conversion modules in the operating state.
  • the running state here refers to the state in which the power conversion module is switched in and is working
  • the running time here refers to the sum of the time that the power conversion module is in the running state during the entire running process of the fan.
  • the M power conversion modules include j power conversion modules in a running state, and controlling at least one power conversion module to switch out includes, according to the operating time of each of the j power conversion modules, controlling the power conversion module , wherein, if the running time of the jth power conversion module is greater than the running time of the j-1th power conversion module, the jth power conversion module is controlled to switch in before the j-1th power conversion module; wherein , j is greater than 1 and less than M.
  • the power conversion module with a long running time is preferentially switched out.
  • the M power conversion modules include j power conversion modules in a running state, wherein the running time of the first to jth power conversion modules decreases sequentially.
  • the running time is greater than the running time of the second power conversion module, and so on.
  • the running time of the first power conversion module is longer, so the switching-out running time is given priority.
  • Long 1st Power Conversion Module Priority is given to cutting out power conversion modules with a long running time, which can slow down the aging of components such as power conversion modules and prolong the overall life.
  • the running time in order to avoid being in the running state all the time, the running time needs to be considered. When it needs to be cut out, the long running time is cut out first, which can slow down the aging of components such as the power conversion module. and prolong overall lifespan.
  • the longer standby time is switched in first, so as to avoid a part of the power conversion module running all the time The other part of the power conversion modules is always in the standby state, so that the multiple power conversion modules work in a balanced manner and the overall lifespan is improved.
  • optimizing the cut-in of each power conversion module and controlling each power conversion module more accurately can effectively improve the efficiency of power conversion, reduce the harmonic content in the power grid, and improve the quality of grid-connected power.
  • a 6MW dual-coil winding permanent magnet synchronous power generation system is selected, wherein the two sets of coil windings can be called A and B, the rated power of coil windings A and B are both 3MW, and a single set of power conversion
  • the circuit includes six power conversion modules, and the rated power of a single power conversion module is 500kW.
  • the power of the coil winding B in the running state is controlled to be increased to the rated power, so that both the coil winding A and the coil winding B are fully output, that is, the coil winding A is fully powered to the outside.
  • the output is 3MW, and the coil winding B fully outputs 3MW.
  • both the coil winding A and the coil winding B are in the running state, and both are in full output, wherein the running time of the coil winding A is longer than the running time of the coil winding B.
  • the coil winding A with a longer operating time is controlled to be cut out, and the external output is 0.
  • the coil winding B in the running state outputs 2.4MW to the outside. At this time, the coil winding B is in the running state, and the coil winding A is in the standby state.
  • the coil winding A in the standby state is controlled to switch in and output 0.6MW to the outside.
  • the coil winding B in the running state outputs 3MW fully to the outside.
  • both the coil winding A and the coil winding B are in the running state, wherein the running time of the coil winding B is greater than the running time of the coil winding A.
  • the power of the coil winding A in the running state is controlled to be increased to the rated power, so that the control coil winding A and the coil winding B both output 3MW to the outside.
  • both the coil winding A and the coil winding B are in the running state, and both are in full output, wherein the running time of the coil winding B is greater than the running time of the coil winding A.
  • the power of the coil winding B which has a long running time, is controlled to decrease and output 0.6MW to the outside. At this time, the coil winding A fully outputs 3MW. At this time, both the coil winding A and the coil winding B are in the running state, and the running time of the coil winding B is greater than the running time of the coil winding A.
  • the coil winding B with a long running time is controlled to be cut out, and the external output is 0.
  • the coil winding A in the running state is controlled to output 2.4MW externally.
  • the coil winding A is in the running state, and the coil winding B is in the standby state.
  • the cut-in and cut-out of the coil windings is optimized. In some cases, it is not necessary to cut in all the coil windings, and part of the coil windings can be cut in, which can slow down the aging of the coil windings and other components and prolong the overall life. ; When the motor is running at low power, reduce the number of coil windings to cut in, so that part of the coil windings can be cut in, which can effectively improve the overall conversion efficiency, reduce grid-connected current harmonics, and improve power quality.
  • more precise control can be performed according to the power situation, for example, when the power of the coil winding is 0 ⁇ When P ⁇ 500kW, switch to a single power module to generate power; when the power of the coil winding is 500kW ⁇ P ⁇ 1000kW, switch to two power modules to generate power; and so on, when the power of the coil winding is 2500kW ⁇ P ⁇ 3000kW, switch to all six The power module generates electricity.
  • the switching-in sequence of the power conversion modules can be controlled according to the standby time. For example, when the power of the coil winding is increased, priority may be given to the power conversion module with a long cut-in standby time.
  • the switching-out sequence of the power conversion modules can be controlled according to the runtime. For example, when the power of the coil winding is reduced, it may be prioritized to switch out the power conversion module with a long operating time. For the specific process, reference may be made to the embodiments shown in FIG. 6 to FIG. 8 above, which will not be repeated here.
  • the embodiments of the present application control the cut-in and cut-out of each power conversion module by obtaining the output power of the coil winding, so that the control process is more refined and the power conversion effect is more accurate, thereby improving the quality of grid-connected power.
  • FIG. 9 is a schematic diagram of an embodiment of the control device 200 of the power conversion circuit of the wind power generation system of the present application.
  • the control device 200 includes one or more processors 201 for implementing the control method of the wind power generation system according to any one of the foregoing embodiments of the control method of the wind power generation system.
  • the embodiment of the control device 200 of the power conversion circuit of the wind power generation system of the present application can be applied to the wind power generation system.
  • the embodiment of the control apparatus 200 may be implemented by software, or may be implemented by hardware or a combination of software and hardware. Taking software implementation as an example, a device in a logical sense is formed by reading the corresponding computer program instructions in the non-volatile memory into the memory through the processor 201 of the wind power generation system where it is located. From a hardware perspective, as shown in FIG. 9 , it is a hardware structure diagram of the wind power generation system where the control device 200 of the present application is located, except for the processor 201 , memory, network interface, and non-volatile components shown in FIG. 9 . In addition to the memory, the wind power generation system in which the device in the embodiment is located generally may also include other hardware according to the actual function of the wind power generation system, which will not be repeated here.
  • the processor 201 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (APPlication Special Integrated Circuits) , ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general purpose processor may be a microprocessor or the processor 201 may be any conventional processor or the like. It is not repeated here.
  • control apparatus 200 shown in FIG. 9 may refer to the control apparatus 107 shown in FIG. 2 above, which will not be repeated here.
  • FIG. 10 is a schematic diagram of an embodiment of a wind power generation system 300 of the present application.
  • the wind power generation system 300 includes a power conversion circuit 301, a motor 302, and the control device 200 of the wind power generation system shown in Fig. 9 described above.
  • the power conversion circuit 301 is connected to the motor 302 for converting the electrical energy output by the motor 302.
  • the power conversion circuit 301 includes a machine-side converter 3010, a DC bus 3011 and a grid-side converter 3012.
  • the machine-side converter The converter 3010 is electrically connected to the motor 302
  • the DC bus 3011 is electrically connected to the machine-side converter 3010
  • the grid-side converter 3012 is electrically connected to the DC bus 3011 .
  • the control device 300 is electrically connected to the machine-side converter 3010 .
  • control device 200 includes one or more processors 201 for implementing the control method for a wind power generation system according to any one of the foregoing embodiments of the control method for a wind power generation system.
  • the power conversion circuit 301 , the machine-side converter 110 , and the grid-side converter 111 shown in FIG. 10 may refer to the power conversion circuit 106 , the machine-side converter 110 , the grid-side converter 111 shown in FIG. 2 above The side converter 111 is not repeated here.
  • the present application further provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by the processor 201, implements any one of the wind power generation system control methods of the first aspect.
  • the computer-readable storage medium may be an internal storage unit of the wind power generation system described in any of the foregoing embodiments, such as a hard disk or a memory.
  • the computer-readable storage medium can also be an external storage device of the wind power generation system, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), an SD card, a flash memory card (Flash Card) and the like equipped on the device.
  • the computer-readable storage medium may also include both an internal storage unit of the wind power generation system and an external storage device.
  • the computer-readable storage medium is used to store the computer program and other programs and data required by the wind power generation system, and can also be used to temporarily store data that has been output or will be output.

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Abstract

一种风力发电系统的控制方法，风力发电系统包括电机与N套功率转换电路，电机包括N套线圈绕组，与N套功率转换电路对应电连接，N为不小于2的正整数，控制方法包括：获取电机的运行功率；根据电机的当前运行功率控制线圈绕组的切入；其中，若电机的当前运行功率低于单套线圈绕组的额定功率，控制N套中的其中一套线圈绕组切入；若电机的当前运行功率高于单套线圈绕组的额定功率，控制N套中的其中至少两套线圈绕组切入。该技术方案优化了线圈绕组的切入切出，可减缓部件的老化，延长整体寿命，可有效提高整体的转换效率，减少并网电流谐波，提升电能质量。另外，还涉及实施上述控制方法的装置以及风力发电系统。

Description

风力发电系统及其控制方法和装置 技术领域
本申请涉及风力发电领域，尤其涉及一种风力发电系统及其控制方法和装置。
背景技术
随着风力发电技术的发展，风力发电系统逐渐发展为现在的双PWM(Pulse width modulation，脉冲宽度调制)背靠背系统的并联运行控制方式。该种方式系统运行稳定，电路可靠性高，在风力发电系统中得到了有效的应用。
目前风力发电系统包括多个功率转换电路，在并网发电时，功率会平均分配到电机的各套线圈绕组，此时，与电机的各套线圈绕组连接的变流器均处于工作状态，使部件老化会加快，影响部件的电气寿命，并且在功率较小时，各个变流器均在低功率运行状态，并网电流的THDi(Total Harmonic Current Distortion，电流谐波总畸变率)偏大，使电机和变流器的整体效率偏低，影响发电量和电能质量。
发明内容
本申请提供一种改进的风力发电系统及其控制方法和装置。
本申请实施例提供一种风力发电系统的控制方法，其中，所述风力发电系统包括电机与N套功率转换电路，所述电机包括N套线圈绕组，与N套所述功率转换电路对应电连接，N为不小于2的正整数，所述控制方法包括：获取所述电机的运行功率；根据所述电机的当前运行功率控制所述线圈绕组的切入；若所述电机的当前运行功率低于单套所述线圈绕组的额定功率，控制N套中的其中一套所述线圈绕组切入；若所述电机的当前运行功率高于单套所述线圈绕组的额定功率，控制N套中的其中至少两套所述线圈绕组切入。
可选的，所述若所述电机的当前运行功率高于单套所述线圈绕组的额定功率，控制N套中的其中至少两套所述线圈绕组切入，包括：判断所述电机的当前运行功率是否高于n套所述线圈绕组的额定功率之和，且低于n+1套所述线圈绕组的额定功率之和；若是，则控制n+1套所述线圈绕组切入，其中控制n+1套中的n套所述线圈绕组输出满发功率，且n+1套中的剩余一套所述线圈绕组输出第一剩余功率，所述第一剩余功率为所述电机的当前运行功率与n倍所述满发功率之差，n大于1，且小于N。
可选的，所述若所述电机的当前运行功率高于单套所述线圈绕组的额定功率，控制N套中的其中至少两套所述线圈绕组切入，包括：若所述电机的当前运行功率升高至少一套所述线圈绕组的额定功率，控制至少一套所述线圈绕组切入；若所述电机的当前运行功率降低至少一套所述线圈绕组的额定功率，控制至少一套所述线圈绕组切出。
可选的，所述线圈绕组的切出顺序和所述线圈绕组的切入顺序相同。
可选的，所述N套线圈绕组中包括处于待机状态的k套线圈绕组，所述控制至少一套所述线圈绕组切入，包括：根据所述k套线圈绕组中每一套所述线圈绕组的待机时间，控制所述线圈绕组的切入，其中，若所述第k套线圈绕组的待机时间大于所述第k-1套线圈绕组的待机时间，则控制所述第k套线圈绕组先于所述第k-1套线圈绕组切入，k大于1，且小于N。
可选的，所述功率转换电路包括机侧开关、机侧变流器、网侧变流器和网侧开关，所述机侧开关电连接于所述机侧变流器与所述电机之间，所述网侧开关电连接于所述网侧变流器与电网之间；所述控制至少一套所述线圈绕组切入，包括：依次控制所述网侧开关闭合、所述网侧变流器进行调制、所述机侧开关闭合以及所述机侧变流器进行调制。
可选的，所述N套线圈绕组中包括t套处于运行状态的线圈绕组，所述控制至少一套所述线圈绕组切出，包括：根据所述t套线圈绕组中每一套所述线圈绕组的运行时间，控制所述线圈绕组的切出，其中，若所述第t套线圈绕组的运行时间大于所述第t-1套线圈绕组的运行时间，则控制所述第t套线圈绕组先于所述第t-1套线圈绕组切入。其中，t大于1，且小于N。
可选的，所述功率转换电路包括机侧开关、机侧变流器、网侧变流器和网侧开关，所述机侧开关电连接于所述机侧变流器与所述电机之间，所述网侧开关电连接于所述网侧变流器与电网之间；所述控制至少一套所述线圈绕组切出，包括：依次控制所述机侧变流器结束调制、所述机侧开关断开、所述网侧变流器结束调制以及所述网侧开关断开。
可选的，至少一套所述功率转换电路包括M个与同一套所述线圈绕组电连接的功率转换模块，M个所述功率转换模块并联连接，M为不小于2的正整数；所述控制方法还包括：根据所述线圈绕组的输出功率控制所述功率转换模块的切入。其中，若所述线圈绕组的输出功率低于单个所述功率转换模块的额定功率，控制M个中的其中一个所述功率转换模块进行调制，并控制其他所述功率转换模块停止调制；若所述线圈绕组的输出功率高于单个所述功率转换模块的额定功率，控制M个中的其中至少两个所述功率转换模块进行调制，并控制其他所述功率转换模块停止调制。
可选的，所述若所述线圈绕组的输出功率高于单个所述功率转换模块的额定功率，控制M个中的其中至少两个所述功率转换模块进行调制，包括：判断所述线圈绕组的当前输出功率是否高于m个所述功率转换模块的额定功率，且不高于m+1个所述功率转换模块的额定功率之和；若是，则控制m+1个所述功率转换模块进行调制，其中控制m+1个中的m个所述功率转换模块输出额定功率，且m+1个中的剩余一个所述功率转换模块输出第二剩余功率，所述第二剩余功率为所述线圈绕组的当前输出功率与m倍所述额定功率之差。其中，m大于1，且小于M。
可选的，所述若所述线圈绕组的输出功率高于单个所述功率转换模块的额定功率，控制M个中的其中至少两个所述功率转换模块进行调制，包括：若所述线圈绕组的输出功率升高至少一个所述功率转换模块的额定功率，控制至少一个所述功率转换模块切入并进行调制；若所述线圈绕组的输出功率降低至少一个所述功率转换模块的额定功率， 控制至少一个所述功率转换模块切出并结束调制。
可选的，所述功率转换模块的切出顺序和所述功率转换模块的切入顺序相同。
可选的，所述M个所述功率转换模块中包括处于待机状态的i个功率转换模块，所述控制至少一个所述功率转换模块切入，包括：根据所述i个功率转换模块中每个所述功率转换模块的待机时间，控制所述功率转换模块的切入，其中，若所述第i个功率转换模块的待机时间大于所述第i-1个功率转换模块的待机时间，则控制所述第i个功率转换模块先于所述第i-1个功率转换模块切入。其中，i大于1，且小于M。
可选的，所述M个所述功率转换模块中包括处于运行状态的j个功率转换模块，所述控制至少一个所述功率转换模块切出，包括：根据所述j个功率转换模块中每个所述功率转换模块的运行时间，控制所述功率转换模块的切出，其中，若所述第j个功率转换模块的运行时间大于所述第j-1个功率转换模块的运行时间，则控制所述第j个功率转换模块先于所述第j-1个功率转换模块切入。其中，j大于1，且小于M。
本申请还提供一种计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现上述任一项所述的风力发电系统的控制方法。
本申请还提供一种风力发电系统的控制装置，其中，包括一个或多个处理器，用于实现上述任一项所述的风力发电系统的控制方法。
本申请还提供一种风力发电系统，其中，包括：电机，包括N套线圈绕组，N为不小于2的正整数；N套功率转换电路，与N套所述线圈绕组对应电连接；及上述所述的风力发电系统的控制装置，所述控制装置电连接所述功率转换电路。
根据本申请实施例提供的技术方案，根据电机的当前运行功率控制线圈绕组的切入，在低于单套线圈绕组的额定功率时，控制其中一套线圈绕组切入，在高于单套线圈绕组的额定功率时，控制其中至少两套线圈绕组切入，与相关技术相比，优化线圈绕组的切入切出，可减缓部件的老化，延长整体寿命，可有效提高整体的转换效率，减少并网电流谐波，提升电能质量。
附图说明
图1所示为本申请的风力发电系统的结构示意图；
图2所示为图1所示风力发电系统的电路示意图；
图3所示为图2所示风力发电系统的控制方法的一个实施例的流程图；
图4所示为图3所示风力发电系统的控制方法的步骤S13的一个实施例的流程图；
图5所示为图3所示风力发电系统的控制方法的步骤S13的另一个实施例的流程图；
图6所示为图3所示风力发电系统的控制方法的又一个实施例的流程图；
图7所示为图6所示风力发电系统的控制方法的步骤S21的一个实施例的流程图；
图8所示为图6所示风力发电系统的控制方法的步骤S21的另一个实施例的流程图；
图9所示为本申请风力发电系统的功率转换电路的控制装置的一个实施例的原理图；
图10为本申请的风力发电系统的一个实施例的原理图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置的例子。
在本申请使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。除非另作定义，本申请使用的技术术语或者科学术语应当为本申请所属领域内具有一般技能的人士所理解的通常意义。本申请说明书以及权利要求书中使用的“一个”或者“一”等类似词语也不表示数量限制，而是表示存在至少一个。“多个”包括两个，相当于至少两个。“包括”或者“包含”等类似词语意指出现在“包括”或者“包含”前面的元件或者物件涵盖出现在“包括”或者“包含”后面列举的元件或者物件及其等同，并不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而且可以包括电性的连接，不管是直接的还是间接的。在本申请说明书和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。
图1所示为本申请的风力发电系统100的结构示意图。如图1所示，风力发电系统100包括从支承表面101延伸的塔架102、安装在塔架102上的机舱103，以及组装至机舱103的转子104。转子104包括可旋转的轮毂1040和至少一个转子叶片1041，转子叶片1041连接至轮毂1040且从轮毂1040向外延伸。在图1所示的实施例中，转子104包括三个转子叶片1041。在一些其他实施例中，转子104可包括更多或更少的转子叶片。多个转子叶片1041可围绕轮毂1040隔开，以促进使转子104旋转，以使风能能够换成可用的机械能，且随后转换成电能。
在一些实施例中，机舱103内设置电机(未图示)，电机(未图示)可连接到转子104，以用于从由转子104生成的机械能生成电功率。在一些实施例中，机舱103内还设置控制装置(未图示)，控制装置(未图示)可通信地连接至风力发电系统100的电气部件，以便控制此类部件的运行。在一些实施例中，控制装置(未图示)也可设置于风力发电系统100的任何其他部件内，或在风力发电系统100外的位置。在一些实施例中，控制装置(未图示)可以包括计算机或其他处理单元。在一些其他实施例中，控制装置(未图示)可以包括合适的计算机可读指令，计算机可读指令在执行时对控制装置(未图示)进行配置，以便执行各种不同功能，例如，接收、传输和/或执行风力发电系统100的控制信号。在一些实施例中，控制装置(未图示)可以配置用于控制风力发电系统100的各种运行模式(例如，起动或停机序列)和/或控制风力发电系统100的各种部件。
图2所示为图1所示的风力发电系统100的电路示意图。如图2所示，风力发电系 统100包括电机105和与电机105连接的N套功率转换电路106，N为不小于2的正整数。电机105可以包括异步电机或同步电机。在一些实施例中，功率转换电路106可接收电机105输出的电信号，并将该电信号进行转换后输出。功率转换电路106可将交流电信号转换为直流电信号，再转换为工频的交流电输出。在本实施例中，电机105包括N套线圈绕组(未图示)，N套功率转换电路106与N套线圈绕组对应电连接，N套功率转换电路106用于接收N套线圈绕组输出的电信号，并将该电信号进行转换后输出。
在一些实施例中，风力发电系统100包括控制装置107，控制装置107和功率转换电路106连接，用于控制功率转换电路106对电机105输出的电信号进行转换。
在一些实施例中，风力发电系统100包括与功率转换电路106连接的变压器108，变压器108电连接电网109。功率转换电路106输出的转换后的电信号可由变压器108升压后输送到电网109。
在图2所示的实施例中，功率转换电路106包括机侧变流器110和网侧变流器111以及连接于机侧变流器110与网侧变流器111之间的直流母线112。机侧变流器110连接电机105，网侧变流器111连接变压器108，且机侧变流器110连接网侧变流器111。在一些实施例中，机侧变流器110包括整流器，网侧变流器111包括逆变器。电机105输出的电信号为交流电信号，机侧变流器110用于将电机105输出的电信号转换为直流电信号，网侧变流器111用于将直流电信号转换为转换输出电信号，并将转换输出电信号输出给变压器108。
控制装置107可包括机侧控制装置113和网侧控制装置114，机侧控制装置113连接机侧变流器110，用于控制机侧变流器110将电机105输出的电信号转换为直流电信号。网侧控制装置114连接网侧变流器111，用于控制网侧变流器111将直流电信号转换为转换输出电信号。此处，机侧控制装置113可控制转换得到的直流电信号的电压和/或功率，网侧控制装置114可控制转换得到的转换输出电信号的电压和/或功率。
机侧控制装置113和网侧控制装置114可以包括任何合适的可编程电路或者装置，例如数字信号处理器(Digital Signal Processor，DSP)、现场可编程门阵列(Field Programmable Gate Array，FPGA)、可编程逻辑控制器(Programmable Logic Controller，PLC)以及专用集成电路(APPlication SPecific Integrated Circuit，ASIC)等。机侧控制装置113和网侧控制装置114可通过软硬件结合的形式实现控制。
在一些实施例中，机侧变流器110包括多个功率开关管，机侧控制器113通过控制多个功率开关管的开合状态，使机侧变流器110进行调制。在一些实施例中，机侧控制器113控制多个功率开关管同时保持断开状态，使机侧变流器110结束调制。这里的调制指的是机侧变流器110采用SVPWM(SPace Vector Pulse Width Modulation，空间矢量脉宽调制)或者SPWM(Sinusoidal Pulse Width Modulation，正弦脉宽脉宽调制)等调制方式通过控制功率开关按照程序设定的逻辑导通或关断。
在一些实施例中，如图2所示，功率转换电路106还包括机侧开关115，电连接于机侧变流器110与电机105之间，以控制机侧变流器110与电机105连接或断开。
在一些实施中，网侧变流器111包括多个功率开关管，网侧控制器114通过控制多个功率开关管的开合状态，控制网侧变流器111的调制状态。在一些实施例中，网侧控制器114控制多个功率开关管的开合状态，使网侧变流器111进行调制。在一些实施例中，网侧控制器114控制多个功率开关管同时保持断开，使网侧变流器111结束调制。在一些实施例中，调制指的是机侧变流器110采用SVPWM(SPace Vector Pulse Width Modulation，空间矢量脉宽调制)或者SPWM(Sinusoidal Pulse Width Modulation，正弦脉宽脉宽调制)等调制方式通过控制功率开关按照程序设定的逻辑导通或关断。
在一些实施例中，如图2所示，功率转换电路106还包括网侧开关116，电连接于网侧变流器111和电网109之间，以控制网侧变流器111和电网109连接或断开。
图2中仅为了图示说明的目的，示出了与一套功率转换电路106电连接的机侧控制器113和网侧控制器114，其他套功率转换电路106也电连接有机侧控制器和网侧控制器，也类似于机侧控制器113和网侧控制器114，在图2中未示出，在此不再赘述。
图3所示为图2所示的风力发电系统100的控制方法的一个实施例的流程图。如图3所示，风力发电系统100的控制方法包括步骤S10-S11。
步骤S10，获取电机的当前运行功率；
在一些实施例中，通过控制装置可以获取电机的当前运行功率。在一些实施例中，控制装置可以包括任何合适的可编程电路或者装置，例如数字信号处理器(Digital Signal Processor，DSP)、现场可编程门阵列(Field Programmable Gate Array，FPGA)、可编程逻辑控制器(Programmable Logic Controller，PLC)以及专用集成电路(APPlication SPecific Integrated Circuit，ASIC)等，可通过软硬件结合的形式实现对电机的当前运行功率的获取。
步骤S11，根据电机的当前运行功率控制线圈绕组的切入。
进一步地，步骤S11包括步骤S12-S13。其中，步骤S12，若电机的当前运行功率低于单套线圈绕组的额定功率，控制N套中的其中一套线圈绕组切入。
在一些实施例中，单套线圈绕组的额定功率为P n，获取的电机的当前运行功率为P1，电机有N套线圈绕组，功率转换电路有N套。在电机低功率运行时，电机的当前运行功率P1低于单套线圈绕组的额定功率P n时，此时控制与其中一套线圈绕组电连接的功率转换电路进行调制，使单套线圈绕组切入，以使电机通过单套线圈绕组对外输出功率。在功率转换电路开始调制时，机侧开关和网侧开关均闭合，使线圈绕组切入，这里的切入是指线圈绕组对外供电。同时，与其余套线圈绕组电连接的功率转换电路处于非工作状态，这样可减缓部分部件的老化，延长整体寿命。
步骤S13，若电机的当前运行功率高于单套线圈绕组的额定功率，控制N套中的其中至少两套线圈绕组切入。
在一些实施例中，单套线圈绕组的额定功率为P n，获取的电机的当前运行功率为P1，电机有N套线圈绕组，功率转换电路有N套。在电机高功率运行时，电机的当前运行功率P1高于单套线圈绕组的额定功率时，可根据当前运行功率P1控制至少两套线圈绕组电连接的功率转换电路进行调制，使至少两套线圈绕组切入。
与相关技术相比，本申请实施例根据电机的当前运行功率，优化线圈绕组的切入数量，在一些情况下可以无需切入全部的线圈绕组，使部分线圈绕组切入，如此可减缓线圈绕组等部件的老化，延长整体寿命；在电机处于低功率运行的工况时，减少线圈绕组的切入数量，使部分的线圈绕组切入，如此可有效提高整体的转换效率，降低并网电流谐波，提升电能质量。
图4所示为图3所示的风力发电系统100的控制方法的步骤S13的一个实施例的流程图。如图4所示，风力发电系统100的控制方法的步骤S13包括步骤S131-S132。
步骤S131，判断电机的当前运行功率是否高于n套线圈绕组的额定功率之和，且低于n+1套线圈绕组的额定功率之和；
步骤S132，若是，则控制n+1套线圈绕组切入，其中控制n+1套中的n套线圈绕组输出满发功率，且n+1套中的剩余一套线圈绕组输出第一剩余功率，第一剩余功率为电机的当前运行功率与n倍满发功率之差；其中，n大于1，且小于N。
在一些实施例中，单套线圈绕组的额定功率为P n，获取的电机的当前运行功率为P1，电机有N套线圈绕组，功率转换电路有N套。在一些实施例中，电机的当前运行功率P n≤P1＜2P n时，控制与两套线圈绕组电连接的功率转换电路进行调制，使两套线圈绕组切入，其中保持其中一套线圈绕组输出满发功率，且剩余一套线圈绕组输出剩余的功率。在一些实施例中，在电机的当前运行功率为2P n≤P1＜3P n时，控制与三套线圈绕组电连接的功率转换电路进行调制，使三套线圈绕组切入，其中保持其中两套线圈绕组输出满发功率，且剩余一套线圈绕组输出剩余的功率。以此类推，在电机的当前运行功率为nP n≤P1＜(n+1)P n时，控制n+1套线圈绕组切入，其中控制n+1套中的n套线圈绕组输出满发功率，且n+1套中的剩余一套线圈绕组输出剩余的功率，剩余的功率为电机的当前运行功率与n倍满发功率之差。进一步地，当电机的当前运行功率P1＝(n+1)P n，此时控制n+1套线圈绕组输出满发功率。与相关技术相比，本申请实施例根据电机的当前运行功率，优化线圈绕组的切入数量，在一些情况下可以无需切入全部的线圈绕组，使部分的线圈绕组切入，如此可减缓线圈绕组等部件的老化，延长整体寿命；在电机处于低功率运行的工况时，减少线圈绕组的切入数量，使部分的 线圈绕组切入，如此可有效提高整体的转换效率，降低并网电流谐波，提升电能质量。
图5所示为图3所示的风力发电系统100的控制方法的步骤S13的另一个实施例的流程图。如图5所示，风力发电系统100的控制方法的步骤S13还包括步骤S133-S134。
步骤S133，若电机的当前运行功率升高至少一套线圈绕组的额定功率，控制至少一套线圈绕组切入。
在一些实施例中，在电机的当前运行功率升高时，可以根据当前运行功率升高的幅度来控制线圈绕组的切入。电机的当前运行功率升高的幅度大于或等于一套线圈绕组的额定功率时，控制至少一套线圈绕组切入。在一些实施例中，单套线圈绕组的额定功率为P n，获取的电机的当前运行功率为P1，在电机的当前运行功率P1升高的幅度等于单套线圈绕组的额定功率P n时，控制其中一套线圈绕组切入。在一些实施例中，在电机的当前运行功率P1升高的幅度大于单套线圈绕组的额定功率P n，此时控制两套以上的线圈绕组切入，根据电机的当前运行功率，优化线圈绕组的切入数量，提高运行效率。
进一步地，对于线圈绕组的切入过程，可以根据待机状态的线圈绕组的待机时间控制线圈绕组的切入顺序。这里的待机状态指的是线圈绕组被切出，处于未工作的状态，这里的待机时间指的是线圈绕组在风机在某一运行周期内处于待机状态的时间总和。该运行周期可以为整个运行进程，也可以为某一设定的运行周期。例如，N套线圈绕组中包括处于待机状态的k套线圈绕组，根据k套线圈绕组中每一套线圈绕组的待机时间，控制线圈绕组的切入，其中，若第k套线圈绕组的待机时间大于第k-1套线圈绕组的待机时间，则控制第k套线圈绕组先于第k-1套线圈绕组切入，其中，k大于1，且小于N。在一些实施例中，在电机的当前运行功率升高的幅度大于一套线圈绕组的额定功率时，在需要切入处于待机状态的线圈绕组时，优先考虑切入待机时间长的线圈绕组。例如，N套线圈绕组中包括处于待机状态的k套线圈绕组，其中，第1套至第k套线圈绕组的待机时间依次减小，在此过程中，第1套线圈绕组的待机时间大于第2套线圈绕组的待机时间，以此类推，在第1套至第k套线圈绕组中，第1套线圈绕组的待机时间比较长，因此，优先考虑切入待机时间长的第1套线圈绕组。优先考虑切入待机时间长的线圈绕组，使各套线圈绕组均衡工作，延长各套线圈绕组的使用寿命。在此过程中，控制线圈绕组的切入时序包括，依次控制网侧开关闭合、网侧变流器进行调制、机侧开关闭合以及机侧变流器进行调制。例如，在需要切入线圈绕组时，首先对直流母线进行预充电，然后闭合网侧开关，接着控制网侧变流器进行调制，然后闭合机侧开关，接着控制机侧变流器进行调制，以使功率升高。
步骤S134，若电机的当前运行功率降低至少一套线圈绕组的额定功率，控制至少一套线圈绕组切出。
在一些实施例中，在电机的当前运行功率降低时，可以根据当前运行功率降低的幅 度来控制线圈绕组的切出。电机的当前运行功率降低的幅度大于或等于一套线圈绕组的额定功率时，控制至少一套线圈绕组切出。在一些实施例中，单套线圈绕组的额定功率为P n，获取的电机的当前运行功率为P1，在电机的当前运行功率P1降低的幅度等于单套线圈绕组的额定功率时，控制其中一套线圈绕组切出。在一些实施例中，在电机的当前运行功率P1降低的幅度大于单套线圈绕组的额定功率，此时控制两套以上的线圈绕组切出。
在一些实施例中，线圈绕组的切出顺序和线圈绕组的切入顺序相同。在电机的当前运行功率升高时，依次切入多个线圈绕组，先切入的线圈绕组的功率先升高且先满发，最后切入的线圈绕组输出剩余功率。在电机的当前运行功率降低时，先切入的线圈绕组的功率先降低且先切出，从而均衡线圈绕组的运行时间，提高整体寿命。
在另一些实施例中，对于线圈绕组的切出过程，可根据运行状态的线圈绕组的运行时间控制线圈绕组的切出顺序。运行状态指的是线圈绕组被切入处于工作的状态，运行时间指的是线圈绕组在某一运行周期内处于运行状态的时间总和。该运行周期可为整个运行进程，也可为某一设定的运行周期。例如，N套线圈绕组中包括t套处于运行状态的线圈绕组，根据k套线圈绕组中每一套线圈绕组的运行时间，控制线圈绕组的切出，其中，若第t套线圈绕组的运行时间大于第t-1套线圈绕组的运行时间，则控制第t套线圈绕组先于第t-1套线圈绕组切入；其中，t大于1，且小于N。在一些实施例中，在电机的当前运行功率降低的幅度大于一套线圈绕组的额定功率时，在需要切出处于运行状态的线圈绕组时，优先考虑切出运行时间长的线圈绕组。例如，N套线圈绕组中处于运行状态的t套线圈绕组中，其中，第1套至第t套线圈绕组的运行时间依次减小，在此过程中，第1套线圈绕组的运行时间大于第2套线圈绕组的运行时间，以此类推，在第1套至第t套线圈绕组中，第1套线圈绕组的运行时间比较久，因此，优先考虑切出运行时间长的第1套线圈绕组。优先考虑切出运行时间比较久的线圈绕组，可减缓各套线圈绕组等部件的老化，从而使多套线圈绕组均衡工作，提高整体寿命。
在一些实施例中，对于处于运行状态的线圈绕组，为避免一直处于运行状态，需考虑运行时间，在需要切出时将运行时间长的先切出，可避免部分线圈绕组等部件的老化快而导致电机整体寿命短，如此延长整体寿命。在一些实施例中，对于处于待机状态的线圈绕组，为避免一直处于待机状态，需考虑待机时间，在需要切入时将待机时间比较长的先切入，从而避免出现一部分线圈绕组一直处于运行状态，另一部分线圈绕组一直处于待机状态，从而使多套线圈绕组均衡工作，提高整体寿命。在此过程中，控制线圈绕组的切出时序包括，依次控制机侧变流器结束调制、机侧开关断开、网侧变流器结束调制以及网侧开关断开。例如，在需要切出线圈绕组时，首先控制机侧变流器停止调制，接着断开机侧开关，然后控制网侧变流器停止调制，接着断开网侧开关，以使功率降低。
在一些实施例中，单套线圈绕组的额定功率为P n，获取的电机的当前运行功率为 P1，电机有N套线圈绕组，功率转换电路有N套，N套线圈绕组包括第1套线圈绕组至第N套线圈绕组。在一些实施例中，第1套线圈绕组至第N套线圈绕组的待机时间依次减小。在电机的当前运行功率P1低于单套线圈绕组的额定功率P n时，因第1套线圈绕组的待机时间最长，此时控制第1套线圈绕组切入，以使电机通过第1套线圈绕组对外输出功率。在电机的当前运行功率P1升高且升高的幅度大于或等于单套线圈绕组的额定功率P n时，优先考虑切入待机时间比较长的线圈绕组。例如，在电机的当前运行功率P1从低于P n升高至P n≤P1＜2P n时，因为在第2套线圈绕组至第N套线圈绕组中，第2套线圈绕组的待机时间比较长，因此，优先切入待机时间比较长的第2套线圈绕组，因此，此时控制第1套线圈绕组满发，控制第2套线圈绕组切入发电；同理，在电机的当前运行功率P1继续升高至2P n≤P1＜3P n时，此时控制第1套线圈绕组和第2套线圈绕组满发，控制第3套线圈绕组切入发电；以此类推，在电机的当前运行功率P1升高至(N-1)P n≤P1＜NP n时，此时控制第N套线圈绕组切入发电；在电机的当前运行功率P1升高至P1＝NP n时，此时控制各套线圈绕组均输出满发功率。
在一些实施例中，第1套线圈绕组至第N套线圈绕组的运行时间依次增大，在电机的当前运行功率P1降低且降低的功率幅度大于或等于一套线圈绕组的额定功率P n时，优先考虑切出运行时间比较久的线圈绕组。在一些实施例中，在电机的当前运行功率P1从P1＝NP n降低至(N-1)P n≤P1＜NP n时，因为在第1套线圈绕组至第N套线圈绕组中，第N套线圈绕组的运行时间比较久，因此优先降低运行时间比较久的第N套线圈绕组的功率。在电机的当前运行功率P1继续降低至(N-2)P n≤P1＜(N-1)P n时，因为在第1套线圈绕组至第N套线圈绕组中，第N套线圈绕组的运行时间比较久，因此优先切出运行时间比较久的第N套线圈绕组，此时控制第N套线圈绕组切出，第N-1套线圈绕组的输出功率降低，其余各套线圈绕组满发，以此类推。同理，在电机的当前运行功率P1再次降至P1＜P n时，此时除了第1套线圈绕组外，其他线圈绕组均切出发电。当电机的当前运行功率P1再次升高至P n≤P1＜2P n时，此时控制第1套线圈绕组满发，第2套线圈绕组切入发电。在电机的当前运行功率P1升高至P1＝NP n时，此时各套线圈绕组再次输出满发功率。在电 机的当前运行功率P1再次降低至(N-1)P n≤P1＜NP n时，则控制其他线圈绕组满发，第N套线圈绕组降低。在电机的当前运行功率P1降低至(N-2)P n≤P1＜(N-1)P n时，此时控制第N套线圈绕组切出发电，第N-1套线圈绕组的输出功率降低，其余各套线圈绕组满发，以此类推。在电机的当前运行功率P1再次降低且小于P n，此时控制第1套线圈绕组对外输出功率，其他线圈绕组切出。进一步地，根据电机的当前运行功率，控制各套线圈绕组轮流启停，可以很好地均衡各套线圈绕组的切入切出，在一些情况下，优先考虑切入待机时间比较长的线圈绕组，在一些情况下，优先考虑切出运行时间比较久的线圈绕组，从而可减缓各套线圈绕组等部件的老化，延长电机整体寿命。
需要说明的是，上文仅是举例说明，然而在电机的当前运行功率P1升高时，并不局限于升高至最大值时才降低，电机的当前运行功率P1降低时，并不局限于降低至最小值时才可升高，电机的当前运行功率的升高和降低由风机实际运行情况决定。另外，需要说明的是，各套线圈绕组的切入切出是平滑完成的，可以使电机的受力变化比较平缓，减少因线圈绕组切入切出带来的震动。这里的平滑完成指的是的电机的功率变化是逐渐变大或者逐渐变小，而不是骤然的变大或变小，在此不再赘述。
图6所示为图3所示的风力发电系统100的控制方法的又一个实施例的流程图。在一些实施例中，至少一套功率转换电路包括M个与同一套线圈绕组电连接的功率转换模块，M个功率转换模块并联连接，M为不小于2的正整数；如图6所示，与图3所示的实施例的控制方法相似，图6所示的实施例中，风力发电系统100的控制方法还包括步骤S20。图6所示的实施例是对于每套功率转换电路的M个功率转换模块进行控制。
步骤S20，根据线圈绕组的输出功率控制功率转换模块的切入。
进一步地，步骤S20包括步骤S21-S22，其中，步骤S21，若线圈绕组的输出功率低于单个功率转换模块的额定功率，控制M个中的其中一个功率转换模块进行调制，并控制其他功率转换模块停止调制。
步骤S22，若线圈绕组的输出功率高于单个功率转换模块的额定功率，控制M个中的其中至少两个功率转换模块进行调制，并控制其他功率转换模块停止调制。
在一些实施例中，单个功率转换模块的额定功率为P m，获取的线圈绕组的当前输出功率为P2，功率转换模块有M个。在线圈绕组的当前输出功率P2小于单个功率转换模块的额定功率P m时，此时，控制其中一个功率转换模块切入并进行调制，切出其他功率转换模块，这里的切入是指功率转换模块对线圈绕组输出的电能进行转换。其他功率转换模块处于非工作状态，这样可减缓功率转换模块等部件的老化，延长整体寿命。 在一些实施例中，在线圈绕组的当前输出功率P2大于单个功率转换模块的额定功率P m时，控制其中两个以上功率转换模块切入并进行调制，进一步地，通过获取线圈绕组的输出功率来控制各个功率转换模块的切入和调制，使控制过程更精细化，功率转换效果更精准，便于改善并网电能质量。
图7所示为图6所示的风力发电系统100的控制方法的步骤S21的一个实施例的流程图。如图7所示，风力发电系统100的控制方法的步骤S21包括步骤S211-S212。
步骤S211，判断线圈绕组的当前输出功率是否高于m个功率转换模块的额定功率，且不高于m+1个功率转换模块的额定功率之和；
步骤S212，若是，则控制m+1个功率转换模块进行调制，其中控制m+1个中的m个功率转换模块输出额定功率，且m+1个中的剩余一个功率转换模块输出第二剩余功率，第二剩余功率为线圈绕组的当前输出功率与m倍额定功率之差；其中，m大于1，且小于M。
在一些实施例中，单个功率转换模块的额定功率为P m，获取的线圈绕组的当前输出功率为P2，功率转换模块有M个。在一些实施例中，在线圈绕组的当前输出功率P2为P m≤P2＜2P m时，切入两个功率转换模块并进行调制，同时控制m-2个功率转换模块切出。其中，一个功率转换模块输出额定功率，且剩余一个功率转换模块输出剩余的功率。在一些实施例中，在线圈绕组的当前输出功率P2升高至2P m≤P2＜3P m时，切入三个功率转换模块并进行调制，同时控制m-3个功率转换模块切出。其中，两个功率转换模块输出额定功率，且剩余一个功率转换模块输出剩余的功率。以此类推，在线圈绕组的当前输出功率P2升高至mP m≤P2＜(m+1)P m时，切入m+1个功率转换模块并进行调制，同时控制m个功率转换模块切出，其中，m个功率转换模块输出额定功率，且剩余一个功率转换模块输出剩余的功率。进一步地，在线圈绕组的当前输出功率P2升高至P2＝(m+1)P m，切入m+1个功率转换模块并进行调制，此时m+1个功率转换模块均输出满额功率。与相关技术相比，本申请实施例根据线圈绕组的当前运行功率，优化功率转换模块的切入数量，在一些情况下可以无需切入全部的功率转换模块，使部分的功率转换模块切入，如此可减缓功率转换模块等部件的老化，延长整体寿命，且在线圈绕组处于低功率运行时，更精细化的控制各个功率转换模块的切入，可以提高并网电能质量，降低谐波含量。
图8所示为图6所示的风力发电系统100的控制方法的步骤S21的另一个实施例的 流程图。如图8所示，风力发电系统100的控制方法的步骤S21包括步骤S213-S214。
步骤S213，若线圈绕组的输出功率升高至少一个功率转换模块的额定功率，控制至少一个功率转换模块切入并进行调制。
在一些实施例中，在线圈绕组的输出功率升高时，可以根据输出功率升高的幅度来控制功率转换模块的切入。在一些实施例中，在线圈绕组的输出功率升高的幅度大于或等于一个功率转换模块的额定功率时，控制至少一个功率转换模块切入并进行调制。在一些实施例中，单个功率转换模块的额定功率为P m，获取的线圈绕组的当前输出功率为P2，功率转换模块有M个。在线圈绕组的当前输出功率为P2升高的幅度等于单个功率转换模块的额定功率时，控制其中一个功率转换模块切入。在一些实施例中，在线圈绕组的当前输出功率为P2升高的幅度大于单个功率转换模块的额定功率，此时控制两个以上功率转换模块切入，根据线圈绕组的输出功率，优化功率转换模块切入数量，使得转换效率更为精准，电能质量更好。
进一步地，对于功率转换模块的切入过程，可以根据待机状态的功率转换模块的待机时间来控制功率转换模块的切入顺序。这里的待机状态指的是功率转换模块被切出，且处于未工作的状态，这里的待机时间指的是功率转换模块在整个运行进程中处于待机状态的时间总和。例如，M个功率转换模块中包括处于待机状态的i个功率转换模块，控制至少一个功率转换模块切入，包括，根据i个功率转换模块中每个功率转换模块的待机时间，控制功率转换模块的切入，其中，若第i个功率转换模块的待机时间大于第i-1个功率转换模块的待机时间，则控制第i个功率转换模块先于第i-1个功率转换模块切入；其中，i大于1，且小于M。在一些实施例中，在线圈绕组的输出功率升高的幅度大于一个功率转换模块的额定功率时，在需要切入待机状态的功率转换模块时，优先考虑切入待机时间长的功率转换模块。例如，M个功率转换模块中包括处于待机状态的i个功率转换模块，其中，第1个至第i个功率转换模块的待机时间依次减小，在此过程中，第1个功率转化模块的待机时间大于第2个功率转换模块的待机时间，以此类推，在第1个至第i个功率转换模块中，第1个功率转换模块的待机时间比较长，因此，优先考虑切入待机时间比较长的第1个功率转化模块。优先考虑切入待机时间比较长的功率转换模块，使得各个功率转换模块均衡工作，延长各个功率转换模块的使用寿命。与相关技术相比，电机在低功率运行时，优化各个功率转换模块的切入，更精确地控制使有效提升功率转换的效率，降低电网中的谐波含量，从而改善并网电能质量。
步骤S214，若线圈绕组的输出功率降低至少一个功率转换模块的额定功率，控制至少一个功率转换模块切出并结束调制。
在一些实施例中，在线圈绕组的输出功率降低时，可以根据输出功率降低的幅度来控制功率转换模块的切出。在一些实施例中，在线圈绕组的输出功率降低的幅度大于或等于一个功率转换模块的额定功率时，控制至少一个功率转换模块切出并结束调制。在一些实施例中，单个功率转换模块的额定功率为P m，获取的线圈绕组的当前输出功率为P2，功率转换模块有M个。在线圈绕组的当前输出功率为P2降低的幅度等于单个功 率转换模块的额定功率时，控制其中一个功率转换模块切出并结束调制。在一些实施例中，在线圈绕组的当前输出功率为P2降低的幅度大于单个功率转换模块的额定功率，此时控制两个以上功率转换模块切出。
在一些实施例中，功率转换模块的切出顺序和功率转换模块的切入顺序相同。依次切入的多个功率转换模块，先切入的功率转换模块先切出，从而均衡功率转换模块的运行时间，提高整体寿命。
在另一些实施例中，对于功率转换模块的切出过程，可以根据运行状态的功率转换模块的运行时间控制功率转换模块的切出顺序。这里的运行状态指的是功率转换模块被切入，且处于工作的状态，这里的运行时间指的是功率转换模块在风机的整个运行进程中处于运行状态的时间总和。例如，M个功率转换模块中包括处于运行状态的j个功率转换模块，控制至少一个功率转换模块切出，包括，根据j个功率转换模块中每个功率转换模块的运行时间，控制功率转换模块的切出，其中，若第j个功率转换模块的运行时间大于第j-1个功率转换模块的运行时间，则控制第j个功率转换模块先于第j-1个功率转换模块切入；其中，j大于1，且小于M。在一些实施例中，在线圈绕组的输出功率降低的幅度大于一个功率转换模块的额定功率时，在需要切出处于运行状态的功率转换模块时，优先考虑切出运行时间长的功率转换模块。例如，M个功率转换模块中包括处于运行状态的j个功率转换模块，其中，第1个至第j个功率转换模块的运行时间依次减小，在此过程中，第1个功率转换模块的运行时间大于第2个功率转换模块的运行时间，以此类推，在第1个至第j个功率转换模块中，第1个功率转换模块的运行时间比较久，因此，优先考虑切出运行时间长的第1个功率转换模块。优先考虑切出运行时间比较久的功率转换模块，可减缓各个功率转换模块等部件的老化，延长整体寿命。
在一些实施例中，对于处于运行状态的功率转换模块，为避免一直处于运行状态，需考虑运行时间，在需要切出时将运行时间长的先切出，可减缓功率转换模块等部件的老化和延长整体寿命。在一些实施例中，对于处于待机状态的功率转换模块，为避免一直处于待机状态，需考虑待机时间，在需要切入时将待机时间比较长的先切入，从而避免出现一部分功率转换模块一直处于运行状态，另一部分功率转换模块一直处于待机状态，从而使多个功率转换模块均衡工作，提高整体寿命。
进一步地，电机在低功率运行时，优化各个功率转换模块的切入，更精确地控制各个功率转换模块，可有效提升功率转换的效率，降低电网中的谐波含量，改善并网电能质量。
在一些实施例中，选用一台6MW的双线圈绕组的永磁同步发电系统，其中两套线圈绕组可以称为A和B，线圈绕组A和B的额定功率均是3MW，单套功率转换电路包括六个功率转换模块，单个功率转换模块的额定功率是500kW。采用上述提出的控制方法，其具体执行过程如下：
在获取电机的当前运行功率为2.4MW时，由于此时当前运行功率2.4MW小于单套线圈绕组的额定功率3MW，则控制线圈绕组A对外输出功率2.4MW，B为0。此时， 线圈绕组A处于运行状态，线圈绕组B处于待机状态。
在获取电机的当前运行功率升高时，且升高至3.6MW时，由于此时升高的功率3.6MW超过单套线圈绕组的额定功率3MW，则控制处于运行状态的线圈绕组A的功率升高且对外满发输出3MW，同时控制处于待机状态的线圈绕组B切入，且对外输出0.6MW。此时，线圈绕组A和线圈绕组B均处于运行状态，且线圈绕组A的运行时间大于线圈绕组B的运行时间。
在获取电机的当前运行功率升高至6MW时，则控制处于运行状态的线圈绕组B的功率升高至额定功率，以使线圈绕组A和线圈绕组B均满额输出，即线圈绕组A对外满发输出3MW，线圈绕组B对外满发输出3MW。此时，线圈绕组A和线圈绕组B均处于运行状态，且均为满发输出，其中，线圈绕组A的运行时间大于线圈绕组B的运行时间。
在电机的当前运行功率降低时，且降低至3.6MW时，控制运行时间长的线圈绕组A的功率降低，且对外输出0.6MW，此时，线圈绕组B对外满发输出3MW。此时，线圈绕组A和线圈绕组B均处于运行状态，线圈绕组A的运行时间大于线圈绕组B的运行时间。
在电机的当前运行功率降低至2.4MW时，由于此时当前运行功率2.4MW小于单套线圈绕组的额定功率3MW，则控制运行时间比较久的线圈绕组A切出，且对外输出为0，此时，处于运行状态的线圈绕组B对外输出2.4MW。此时，线圈绕组B处于运行状态，线圈绕组A处于待机状态。
在电机的当前运行功率再次升高时，且升高至3.6MW时，升高的幅度大于一个线圈绕组的额定功率时，此时控制处于待机状态的线圈绕组A切入，并对外输出0.6MW，此时，处于运行状态的线圈绕组B对外满发输出3MW。此时，线圈绕组A和线圈绕组B均处于运行状态，其中，线圈绕组B的运行时间大于线圈绕组A的运行时间。
在电机的当前运行功率再次升高至6MW时，控制处于运行状态的线圈绕组A的功率升高至额定功率，以使则控制线圈绕组A和线圈绕组B均对外满发输出3MW。此时，线圈绕组A和线圈绕组B均处于运行状态，且均为满发输出，其中，线圈绕组B的运行时间大于线圈绕组A的运行时间。
在电机的当前运行功率再次降低时，且降低至3.6MW时，则控制运行时间长的线圈绕组B的功率降低，并对外输出0.6MW，此时，线圈绕组A对外满发输出3MW。此时，线圈绕组A和线圈绕组B均处于运行状态，线圈绕组B的运行时间大于线圈绕组A的运行时间。
在电机的当前运行功率降低至2.4MW时，则控制运行时间长的线圈绕组B切出，并对外输出为0，此时，控制处于运行状态的线圈绕组A对外输出2.4MW。此时，线圈绕组A处于运行状态，线圈绕组B处于待机状态。
以上可以理解为线圈绕组A和线圈绕组B的启停循环过程。进一步地，根据电机的当前运行功率，优化线圈绕组的切入切出，在一些情况下可以无需切入全部的线圈 绕组，使部分的线圈绕组切入，如此可减缓线圈绕组等部件的老化，延长整体寿命；在电机处于低功率运行的工况时，减少线圈绕组的切入数量，使部分的线圈绕组切入，如此可有效提高整体的转换效率，降低并网电流谐波，提升电能质量。
在一些实施例中，在线圈绕组A或线圈绕组B的单套线圈绕组切入或单套线圈绕组不是满额输出时，可以根据功率情况进行更为精确地控制，例如，在线圈绕组的功率0<P<500kW时，切入单个功率模块发电；在线圈绕组的功率500kW<P<1000kW时，切入两个功率模块发电；以此类推，在线圈绕组的功率2500kW<P<3000kW时，切入全部六个功率模块发电。
在一些实施例中，在单套线圈绕组的功率升高时，可根据待机时间控制功率转换模块的切入顺序。例如，在线圈绕组的功率升高时，可优先考虑切入待机时间长的功率转换模块。在一些实施例中，在单套线圈绕组的功率降低时，可根据运行时间控制功率转换模块的切出顺序。例如，在线圈绕组的功率降低时，可优先考虑切出运行时间长的功率转换模块。具体过程可以参考上文中图6至图8所示的实施例，在此不再赘述。
本申请的实施例通过获取线圈绕组的输出功率来控制各个功率转换模块的切入和切出，使控制过程更加精细，功率转换效果更加精准，从而改善并网电能质量。
图9所示为本申请的风力发电系统的功率转换电路的控制装置200的一个实施例的原理图。在一些实施例中，控制装置200包括一个或多个处理器201，用于实现前述风力发电系统的控制方法的实施例中任一项的风力发电系统的控制方法。
本申请的风力发电系统的功率转换电路的控制装置200的实施例可以应用在风力发电系统上。控制装置200的实施例可以通过软件实现，也可以通过硬件或者软硬件结合的方式实现。以软件实现为例，作为一个逻辑意义上的装置，是通过其所在风力发电系统的处理器201将非易失性存储器中对应的计算机程序指令读取到内存中运行形成的。从硬件层面而言，如图9所示，为本申请的控制装置200所在风力发电系统的一种硬件结构图，除了图9所示的处理器201、内存、网络接口、以及非易失性存储器之外，实施例中装置所在的风力发电系统通常根据该风力发电系统的实际功能，还可以包括其他硬件，对此不再赘述。
在一些实施例中，处理器201可以是中央处理单元(Central Processing Unit，CPU)，还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(APPlication SPecific Integrated Circuit，ASIC)、现场可编程门阵列(Field-Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器201也可是任何常规的处理器等。在此不再赘述。
在一些实施例中，图9所示的控制装置200可以参考上文中图2所示的控制装置107，在此不再赘述。
图10为本申请的风力发电系统300的一个实施例的原理图。如图10所示，风力发电系统的300包括功率转换电路301、电机302、及上述图9所示的风力发电系统 的控制装置200。
在一些实施例中，功率转换电路301与电机302连接，用于转换电机302输出的电能，功率转换电路301包括机侧变流器3010、直流母线3011和网侧变换器3012，机侧变流器3010电连接电机302，直流母线3011与机侧变流器3010电连接，网侧变换器3012与直流母线3011电连接。在一些实施例中，控制装置300电连接机侧变流器3010。
在一些实施例中，控制装置200包括一个或多个处理器201，用于实现前述种风力发电系统的控制方法的实施例中任一项的风力发电系统的控制方法。
在一些实施例中，图10所示的功率转换电路301、机侧变流器110、网侧变换器111可以参考上文中图2所示的功率转换电路106、机侧变流器110、网侧变换器111，在此不再赘述。
上述控制装置中各个单元的功能和作用的实现过程具体详见上述方法中对应步骤的实现过程，在此不再赘述。
对于装置实施例而言，由于其基本对应于方法实施例，所以相关之处参见方法实施例的部分说明即可。以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本申请方案的目的。本领域普通技术人员在不付出创造性劳动的情况下，即可以理解并实施。
本申请还提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器201执行时实现第一方面任一项的风力发电系统控制方法。在一些实施例中，计算机可读存储介质可以是前述任一实施例所述的风力发电系统的内部存储单元，例如硬盘或内存。计算机可读存储介质也可以是风力发电系统的外部存储设备，例如所述设备上配备的插接式硬盘、智能存储卡(Smart Media Card，SMC)、SD卡、闪存卡(Flash Card)等。进一步的，计算机可读存储介质还可以既包括风力发电系统的内部存储单元也包括外部存储设备。计算机可读存储介质用于存储所述计算机程序以及所述风力发电系统所需的其他程序和数据，还可以用于暂时地存储已经输出或者将要输出的数据。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本申请保护的范围之内。

Claims (17)

  1. 一种风力发电系统的控制方法，其特征在于，所述风力发电系统包括电机与N套功率转换电路，所述电机包括N套线圈绕组，与N套所述功率转换电路对应电连接，N为不小于2的正整数，所述控制方法包括：
    获取所述电机的运行功率；
    根据所述电机的当前运行功率控制所述线圈绕组的切入；
    其中，若所述电机的当前运行功率低于单套所述线圈绕组的额定功率，控制N套中的其中一套所述线圈绕组切入；
    若所述电机的当前运行功率高于单套所述线圈绕组的额定功率，控制N套中的其中至少两套所述线圈绕组切入。
  2. 根据权利要求1所述的控制方法，其特征在于，若所述电机的当前运行功率高于单套所述线圈绕组的额定功率，控制N套中的其中至少两套所述线圈绕组切入，包括：
    判断所述电机的当前运行功率是否高于n套所述线圈绕组的额定功率之和，且低于n+1套所述线圈绕组的额定功率之和；
    若是，则控制n+1套所述线圈绕组切入，其中控制n+1套中的n套所述线圈绕组输出满发功率，且n+1套中的剩余一套所述线圈绕组输出第一剩余功率，所述第一剩余功率为所述电机的当前运行功率与n倍所述满发功率之差；
    其中，n大于1，且小于N。
  3. 根据权利要求1所述的控制方法，其特征在于，若所述电机的当前运行功率高于单套所述线圈绕组的额定功率，控制N套中的其中至少两套所述线圈绕组切入，包括：
    若所述电机的当前运行功率升高至少一套所述线圈绕组的额定功率，控制至少一套所述线圈绕组切入；
    若所述电机的当前运行功率降低至少一套所述线圈绕组的额定功率，控制至少一套所述线圈绕组切出。
  4. 根据权利要求3所述的控制方法，其特征在于，所述线圈绕组的切出顺序和所述线圈绕组的切入顺序相同。
  5. 根据权利要求3所述的控制方法，其特征在于，所述N套线圈绕组中包括处于待机状态的k套线圈绕组，所述控制至少一套所述线圈绕组切入，包括：
    根据所述k套线圈绕组中每一套所述线圈绕组的待机时间，控制所述线圈绕组的切入，其中，若所述第k套线圈绕组的待机时间大于所述第k-1套线圈绕组的待机时间，则控制所述第k套线圈绕组先于所述第k-1套线圈绕组切入；
    其中，k大于1，且小于N。
  6. 根据权利要求3所述的控制方法，其特征在于，所述功率转换电路包括机侧开关、机侧变流器、网侧变流器和网侧开关，所述机侧开关电连接于所述机侧变流器与所述电机之间，所述网侧开关电连接于所述网侧变流器与电网之间；所述控制至少一套所述线圈绕组切入，包括：依次控制所述网侧开关闭合、所述网侧变流器进行调制、所述机侧 开关闭合以及所述机侧变流器进行调制。
  7. 根据权利要求3所述的控制方法，其特征在于，所述N套线圈绕组中包括t套处于运行状态的线圈绕组，所述控制至少一套所述线圈绕组切出，包括：
    根据所述t套线圈绕组中每一套所述线圈绕组的运行时间，控制所述线圈绕组的切出，其中，若所述第t套线圈绕组的运行时间大于所述第t-1套线圈绕组的运行时间，则控制所述第t套线圈绕组先于所述第t-1套线圈绕组切入；
    其中，t大于1，且小于N。
  8. 根据权利要求3所述的控制方法，其特征在于，所述功率转换电路包括机侧开关、机侧变流器、网侧变流器和网侧开关，所述机侧开关电连接于所述机侧变流器与所述电机之间，所述网侧开关电连接于所述网侧变流器与电网之间；所述控制至少一套所述线圈绕组切出，包括：依次控制所述机侧变流器结束调制、所述机侧开关断开、所述网侧变流器结束调制以及所述网侧开关断开。
  9. 根据权利要求1所述的控制方法，其特征在于，至少一套所述功率转换电路包括M个与同一套所述线圈绕组电连接的功率转换模块，M个所述功率转换模块并联连接，M为不小于2的正整数；所述控制方法还包括：
    根据所述线圈绕组的输出功率控制所述功率转换模块的切入；
    其中，若所述线圈绕组的输出功率低于单个所述功率转换模块的额定功率，控制M个中的其中一个所述功率转换模块进行调制，并控制其他所述功率转换模块停止调制；
    若所述线圈绕组的输出功率高于单个所述功率转换模块的额定功率，控制M个中的其中至少两个所述功率转换模块进行调制，并控制其他所述功率转换模块停止调制。
  10. 根据权利要求9所述的控制方法，其特征在于，所述若所述线圈绕组的输出功率高于单个所述功率转换模块的额定功率，控制M个中的其中至少两个所述功率转换模块进行调制，包括：
    判断所述线圈绕组的当前输出功率是否高于m个所述功率转换模块的额定功率，且不高于m+1个所述功率转换模块的额定功率之和；
    若是，则控制m+1个所述功率转换模块进行调制，其中控制m+1个中的m个所述功率转换模块输出额定功率，且m+1个中的剩余一个所述功率转换模块输出第二剩余功率，所述第二剩余功率为所述线圈绕组的当前输出功率与m倍所述额定功率之差；
    其中，m大于1，且小于M。
  11. 根据权利要求9所述的控制方法，其特征在于，所述若所述线圈绕组的输出功率高于单个所述功率转换模块的额定功率，控制M个中的其中至少两个所述功率转换模块进行调制，包括：
    若所述线圈绕组的输出功率升高至少一个所述功率转换模块的额定功率，控制至少一个所述功率转换模块切入并进行调制；
    若所述线圈绕组的输出功率降低至少一个所述功率转换模块的额定功率，控制至少一个所述功率转换模块切出并结束调制。
  12. 根据权利要求11所述的控制方法，其特征在于，所述功率转换模块的切出顺序和所述功率转换模块的切入顺序相同。
  13. 根据权利要求11所述的控制方法，其特征在于，所述M个所述功率转换模块中包括处于待机状态的i个功率转换模块，控制至少一个所述功率转换模块切入，包括：
    根据所述i个功率转换模块中每个所述功率转换模块的待机时间，控制所述功率转换模块的切入，
    其中，若所述第i个功率转换模块的待机时间大于所述第i-1个功率转换模块的待机时间，则控制所述第i个功率转换模块先于所述第i-1个功率转换模块切入；
    其中，i大于1，且小于M。
  14. 根据权利要求11所述的控制方法，其特征在于，所述M个所述功率转换模块中包括处于运行状态的j个功率转换模块，所述控制至少一个所述功率转换模块切出，包括：
    根据所述j个功率转换模块中每个所述功率转换模块的运行时间，控制所述功率转换模块的切出，其中，若所述第j个功率转换模块的运行时间大于所述第j-1个功率转换模块的运行时间，则控制所述第j个功率转换模块先于所述第j-1个功率转换模块切入；
    其中，j大于1，且小于M。
  15. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现权利要求1至14任一项所述的风力发电系统的控制方法。
  16. 一种风力发电系统的控制装置，其特征在于，包括一个或多个处理器，用于实现如权利要求1至14中任一项所述的风力发电系统的控制方法。
  17. 一种风力发电系统，其特征在于，包括：
    电机，包括N套线圈绕组，N为不小于2的正整数；
    N套功率转换电路，与N套所述线圈绕组对应电连接；及
    权利要求16所述的风力发电系统的控制装置，所述控制装置电连接所述功率转换电路。
PCT/CN2021/093614 2020-09-03 2021-05-13 风力发电系统及其控制方法和装置 Ceased WO2022048185A1 (zh)

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