WO2024131069A1 - 风力发电机组变流控制方法、装置、设备及风力发电系统 - Google Patents

风力发电机组变流控制方法、装置、设备及风力发电系统 Download PDF

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Publication number
WO2024131069A1
WO2024131069A1 PCT/CN2023/109813 CN2023109813W WO2024131069A1 WO 2024131069 A1 WO2024131069 A1 WO 2024131069A1 CN 2023109813 W CN2023109813 W CN 2023109813W WO 2024131069 A1 WO2024131069 A1 WO 2024131069A1
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WIPO (PCT)
Prior art keywords
power
power control
energy storage
machine
grid
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Ceased
Application number
PCT/CN2023/109813
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English (en)
French (fr)
Inventor
李峰
于笑
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Application filed by Beijing Goldwind Science and Creation Windpower Equipment Co Ltd filed Critical Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority to EP23905250.9A priority Critical patent/EP4535593A4/en
Priority to AU2023414097A priority patent/AU2023414097B2/en
Publication of WO2024131069A1 publication Critical patent/WO2024131069A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in networks by storage of energy
    • H02J3/30—Arrangements for balancing of the load in networks by storage of energy using dynamo-electric machines coupled to flywheels
    • 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
    • H02J3/28—Arrangements for balancing of the load in networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
    • 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
    • H02J3/38—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
    • H02J3/46—Controlling the sharing of generated power between the generators, sources or networks
    • 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
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/933—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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 method, device, equipment and a wind power generation system for controlling a current conversion of a wind generator set.
  • a wind turbine is a device that can convert wind energy into electrical energy.
  • the electrical energy generated by a wind turbine can be transmitted to the power grid through the transmission network for distribution and use by the power grid.
  • the rotor kinetic energy of the generator in the wind turbine can be used to provide inertia support for the power grid.
  • the wind turbine will experience excessive fatigue load, thereby reducing the stability of the wind turbine.
  • the embodiments of the present application provide a method, device, equipment and wind power generation system for controlling current conversion of a wind turbine generator set, which can improve the stability of the wind turbine generator set.
  • an embodiment of the present application provides a wind turbine generator set current conversion control method, which is applied to a wind turbine generator set, wherein the wind turbine generator set includes a machine-side converter and a grid-side converter, wherein the grid-side converter is electrically connected to the machine-side converter via a DC bus, and the DC bus is also electrically connected to an energy storage device, wherein the method includes: obtaining a power control amount based on a given DC bus voltage value and a collected DC bus voltage feedback value; when the power control amount exceeds the energy storage power capacity range of the energy storage device, Based on the power capacity boundary value of the energy storage power capacity range, a first power control amount and a second power control amount are determined according to the power control amount, and the first power control amount corresponds to the power capacity boundary value; the energy storage device is controlled based on the first power control amount; the first sum of the second power control amount and the machine-side power set value of the machine-side converter is determined as the updated machine-side power set value, and the machine-side converter
  • an embodiment of the present application provides a wind turbine generator set current conversion control device, which is applied to a wind turbine generator set.
  • the wind turbine generator set includes a machine-side converter and a grid-side converter.
  • the grid-side converter is electrically connected to the machine-side converter through a DC bus.
  • the DC bus is also electrically connected to an energy storage device.
  • the device includes: a power control amount calculation module, which is used to obtain a power control amount based on a DC bus voltage set value and a collected DC bus voltage feedback value; a power control amount allocation module, which is used to determine a first power control amount and a second power control amount according to the power control amount based on a power capacity boundary value of the energy storage power capacity range when the power control amount exceeds an energy storage power capacity range of the energy storage device, and the first power control amount corresponds to the power capacity boundary value; an energy storage control module, which is used to control the energy storage device based on the first power control amount; a machine-side control module, which is used to determine a first sum of the second power control amount and the machine-side power set value of the machine-side converter as an updated machine-side power set value, and control the machine-side converter based on the updated machine-side power set value.
  • a power control amount calculation module which is used to obtain a power control amount based on a DC bus voltage set value and a collected DC bus voltage feedback value
  • an embodiment of the present application provides a wind turbine generator set current conversion control device, comprising: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the wind turbine generator set current conversion control method of the first aspect is implemented.
  • an embodiment of the present application provides a wind power generation system, comprising: a wind turbine generator set, including a machine-side converter and a grid-side converter, the grid-side converter being electrically connected to the machine-side converter via a DC bus; an energy storage device being electrically connected to the DC bus; and the wind turbine generator set current conversion control device in the third aspect.
  • the embodiments of the present application provide a method, device, equipment and wind power generation system for current conversion control of a wind turbine generator set, wherein the wind turbine generator set includes a machine-side converter and a grid-side converter, wherein the machine-side converter and the grid-side converter are electrically connected via a DC bus, and the DC bus is also connected to an energy storage device.
  • a power control amount can be obtained based on a given value of the DC bus voltage and a feedback value of the DC bus voltage.
  • the power control amount that the energy storage device can bear is preferentially allocated to the energy storage device, and the power control amount that the energy storage device can bear is allocated according to the power capacity boundary of the energy storage power capacity range.
  • the energy storage device is split from the power control amount to obtain a first power control amount, and the energy storage device is controlled based on the first power control amount, with the energy storage device providing inertia support for the power grid as a priority.
  • the second power control amount obtained by splitting the power control amount is used to control the machine-side converter, so that the rotor kinetic energy of the wind turbine generator set provides another part of the inertia support for the power grid.
  • the energy storage device and the rotor kinetic energy jointly provide inertia support, minimizing the inertia support provided by the rotor kinetic energy of the wind turbine generator set to the power grid, reducing or even avoiding the situation where the fatigue load of the wind turbine generator set exceeds the limit, thereby improving the stability of the wind turbine generator set.
  • FIG1 is a schematic diagram of the architecture of a wind power generation system provided by an embodiment of the present application.
  • FIG2 is a flow chart of a wind turbine generator set current conversion control method provided by an embodiment of the present application.
  • FIG3 is a schematic diagram of a logical architecture of an example of a wind turbine generator set current conversion control method provided in an embodiment of the present application
  • FIG4 is a flow chart of a wind turbine generator set current conversion control method provided by another embodiment of the present application.
  • FIG5 is a flow chart of a wind turbine generator set current conversion control method provided by another embodiment of the present application.
  • FIG6 is a flow chart of a wind turbine generator set current conversion control method provided by yet another embodiment of the present application.
  • FIG7 is a schematic structural diagram of a current conversion control device for a wind turbine generator set provided in an embodiment of the present application.
  • FIG8 is a schematic structural diagram of a current conversion control device for a wind turbine generator set provided by another embodiment of the present application.
  • FIG9 is a schematic structural diagram of a current conversion control device for a wind turbine generator set provided by another embodiment of the present application.
  • FIG. 10 is a structural diagram of a wind turbine generator set current conversion control device provided in an embodiment of the present application. intention.
  • a wind turbine is a device that can convert wind energy into electrical energy.
  • the electrical energy generated by a wind turbine can be transmitted to the power grid through the transmission network for distribution and use by the power grid.
  • the rotor kinetic energy of the generator in the wind turbine can be used to provide inertia support for the power grid.
  • the wind turbine will experience excessive fatigue load, thereby reducing the stability of the wind turbine.
  • the embodiments of the present application provide a method, device, equipment and wind power generation system for controlling the current conversion of a wind turbine generator set, which are applied to a wind turbine generator set, in which the DC bus between the machine-side converter and the grid-side converter in the wind turbine generator set can be connected to an energy storage device, and the energy storage device can also provide inertia support for the power grid.
  • the power control amount can be obtained based on the voltage parameters of the DC bus.
  • the control amount is split into two parts according to the power capacity of the energy storage device, one part is used for energy storage device control, so that the energy storage device provides inertia support, and the other part is used for machine-side converter control, so that the rotor kinetic energy of the wind turbine generator set provides inertia support.
  • the energy storage device and the rotor kinetic energy jointly provide inertia support, minimize the inertia support provided by the rotor kinetic energy of the generator to the power grid, reduce or even avoid the situation where the fatigue load of the wind turbine generator set exceeds the limit, thereby improving the stability of the wind turbine generator set.
  • wind turbine generator set current conversion control method, device, equipment and wind power generation system provided by the present application are introduced below respectively.
  • FIG1 is a schematic diagram of the architecture of the wind power generation system provided in an embodiment of the present application.
  • the wind turbine generator set includes a machine-side converter 11 and a grid-side converter 13 .
  • the grid-side converter 13 is electrically connected to the machine-side converter 11 via a DC bus 12 .
  • the DC bus 12 is also connected to an energy storage device 14 .
  • the machine-side converter 11 may be used to convert the AC power output by the generator of the wind turbine generator set into DC power, and output the DC power to the DC bus 12.
  • the type of the machine-side converter 11 is not limited herein.
  • the grid-side converter 13 can be used to convert the DC power transmitted by the DC bus 12 into AC power and output it.
  • the type of the grid-side converter 13 is not limited here.
  • the grid-side converter 13 can be electrically connected to the power grid 15, and other devices can be included between the grid-side converter 13 and the power grid 15, which are not limited here.
  • a transformer 16 can be provided between the grid-side converter 13 and the power grid 15.
  • the energy storage device 14 is connected to the DC bus 12.
  • the energy storage device 14 may include, but is not limited to, devices such as batteries and flywheel devices that can store and release energy.
  • the energy storage capacity of the energy storage device 14 can be selected according to the scene, demand, etc. of the wind turbine and the power grid 15, and is not limited here.
  • the energy storage device 14 when the frequency of the power grid 15 decreases, the energy storage device 14 can release energy; when the frequency of the power grid 15 increases, the energy storage device 14 can absorb energy and store it, and can also release the stored energy.
  • the energy storage device 14 may include an energy converter 141 and an energy storage device 142, and the types of the energy converter 141 and the energy storage device 142 are not limited here.
  • the energy converter 141 may be a DC-DC converter
  • the energy storage device 142 may be a battery.
  • the energy storage device 14 and the rotor kinetic energy work together to provide inertia support for the power grid 15, which can reduce the requirements for the performance of the energy storage device 14, such as the charge and discharge rate and energy density, thereby reducing the cost of the energy storage device 14.
  • the use of an energy storage device 14 with lower energy storage performance can also meet the demand for providing inertia support for the power grid, thereby ensuring the stability of the wind power generation system.
  • the present application provides a wind turbine generator set current conversion control method, which can be applied to the wind turbine generator set and the wind power generation system in the above-mentioned embodiment.
  • the wind turbine generator set current conversion control method can be executed by a wind power generation current conversion control device, equipment, etc.
  • FIG2 is a flow chart of a wind turbine generator set current conversion control method provided by an embodiment of the present application. As shown in FIG2, the wind turbine generator set current conversion control method may include steps S201 to S204.
  • step S201 based on the DC bus voltage given value and the collected DC bus voltage feedback Feedback value to obtain the power control amount.
  • the DC bus voltage set value is a preset value of the DC bus voltage, which can be set according to the scene, demand, etc.
  • the DC bus voltage feedback value is the actual voltage value of the collected DC bus.
  • the difference between the DC bus voltage set value and the DC bus voltage feedback value can be calculated first, and the difference is processed by proportional integration, such as inputting the difference into a proportional integral controller, i.e., a PI controller, to obtain a power control amount.
  • the power control amount is used to control the energy storage device and the machine-side converter, or to control the energy storage device.
  • step S202 when the power control amount exceeds the energy storage power capability range of the energy storage device, a first power control amount and a second power control amount are determined according to the power control amount based on a power capability boundary value of the energy storage power capability range.
  • the power control amount and the energy storage power capacity range of the energy storage device can be compared. If the power control amount exceeds the energy storage power capacity range of the energy storage device, it means that the energy storage device is difficult to provide the inertia support corresponding to the power control amount alone; if the power control amount is within the energy storage power capacity range of the energy storage device, it means that the energy storage device can provide the inertia support corresponding to the power control amount alone.
  • the power control amount can be divided into two parts, namely the first power control amount and the second power control amount.
  • the first power control amount is used to control the energy storage device, corresponding to the power capacity boundary value.
  • the second power control amount is used to control the machine-side converter.
  • the energy storage device is preferentially used to provide inertia support for the power grid, and the first power control amount is obtained according to the power capacity boundary value of the energy storage power capacity range.
  • the power capacity boundary value of the energy storage power capacity range may include the maximum discharge power or the maximum charging power of the energy storage power capacity range.
  • the power capacity boundary value of the energy storage power capacity range is the maximum discharge power of the energy storage power capacity range; when the frequency of the power grid rises, the power capacity boundary value of the energy storage power capacity range is the maximum charging power of the energy storage power capacity range.
  • the sum of the first power control amount and the second power control amount is the power control amount. That is, after obtaining the first power control amount, the difference between the power control amount and the first power control amount can be calculated and the difference is determined as the second power control amount.
  • step S203 the energy storage device is controlled based on the first power control amount.
  • the power feedback value of the energy storage device can be obtained, and the preset control strategy is used based on the first power
  • the energy storage device is controlled by the control amount and the power feedback value.
  • the control strategy for the energy storage device may include a power control strategy and/or a non-power control strategy, which is not limited here.
  • the input of the power control strategy may include the power control amount, and the input of the power control strategy may include the power difference between the first power control amount and the power feedback value.
  • the power control strategy may include a power closed-loop strategy or other control strategy that directly uses the power control amount as input.
  • the non-power control strategy may include a current closed-loop strategy or other control strategy that uses non-power control amounts as input, and the input of the non-power control strategy may be converted based on the power control amount.
  • a third power control amount is obtained based on the first power control amount and the collected power feedback value of the energy storage device; and the energy storage device is controlled using a power closed-loop strategy based on the third power control amount.
  • the power feedback value of the energy storage device is the actual power of the collected energy storage device.
  • the third power control chain may be the difference between the first power control amount and the power feedback value of the energy storage device.
  • the third power control amount may be used as an input to the power closed-loop strategy to control the energy storage module to store energy or release energy based on the power closed-loop strategy.
  • a third power control quantity is obtained based on the first power control quantity and the collected power feedback value of the energy storage device; the third power control quantity is converted into a first non-power control quantity, and the energy storage device is controlled using a first non-power control strategy based on the first non-power control quantity.
  • the content of the third power control quantity can be found in the relevant descriptions in the above embodiments and will not be repeated here.
  • the first non-power control quantity includes a non-power control quantity.
  • the input of the first non-power control strategy is a non-power control quantity.
  • the input of the first non-power control strategy is the first non-power control quantity.
  • the first non-power control quantity includes a current control quantity
  • the first non-power control strategy may include a control strategy such as a current closed-loop strategy whose input is a current control quantity.
  • the energy storage device may also be controlled by using a power closed-loop strategy and a first non-power control strategy together according to the first power control amount and the first non-power control amount.
  • the energy storage value may be controlled by using a current closed-loop strategy in the inner loop and a power closed-loop strategy in the outer loop according to the first power control amount and the current control amount converted from the first power control amount.
  • step S204 a first sum of the second power control amount and the generator-side power given value of the generator-side converter is determined as an updated generator-side power given value, and the generator-side converter is controlled based on the updated generator-side power given value.
  • the rotor kinetic energy of the wind turbine generator set not only provides the corresponding power given value of the original machine side power
  • an inertia support corresponding to the second power control amount allocated to the generator-side converter is also required.
  • the generator-side power set value is a preset value of the power of the generator-side converter, which can be set according to the scene, demand, etc.
  • the first sum of the second power control amount and the generator-side power set value of the generator-side converter can be determined as the updated generator-side power set value, and the inertia corresponding to the updated generator-side power set value is the sum of the inertia corresponding to its original generator-side power set value and the inertia corresponding to the second power control amount.
  • the machine-side converter can be controlled based on the updated machine-side power set value and the machine-side power feedback value using a preset control strategy.
  • the control strategy for the machine-side converter may include a power control strategy and/or a non-power control strategy, which is not limited here.
  • the input of the power control strategy may include a power control quantity.
  • the power control strategy may include a power closed-loop control strategy or other control strategy that directly uses the power control quantity as input.
  • Non-power control strategies may include vector control, direct torque control, and other control strategies that use non-power control quantities as input.
  • the input of the non-power control strategy may be obtained based on the conversion of the power control quantity.
  • a fourth power control quantity can be obtained according to the updated machine-side power set value and the collected machine-side power feedback value, and the machine-side converter can be controlled according to the fourth power control quantity using a power closed-loop strategy.
  • the machine-side power feedback value is the actual power of the collected machine-side converter.
  • the fourth power control quantity can be the difference between the updated machine-side power set value and the machine-side power feedback value.
  • the fourth power control quantity can be used as an input of the power closed-loop strategy, and the machine-side converter can be controlled based on the power closed-loop strategy, thereby controlling the inertial support provided by the rotor kinetic energy of the wind turbine generator set.
  • a fourth power control quantity can be obtained according to the updated machine-side power given value and the collected machine-side power feedback value, and the fourth power control quantity is converted into a second non-power control quantity.
  • the machine-side converter is controlled using a second non-power control strategy.
  • the content of the fourth power control quantity can be found in the relevant descriptions in the above embodiments, which will not be repeated here.
  • the second non-power control quantity includes a non-power control quantity, and the input of the second non-power control strategy is a non-power control quantity. In an embodiment of the present application, the input of the second non-power control strategy is the second non-power control quantity.
  • the second non-power control quantity includes a current control quantity
  • the second non-power control strategy may include a control strategy such as a vector control strategy whose input is a current control quantity.
  • the second non-power control quantity includes a torque control quantity
  • the second non-power control strategy may include a control strategy such as a direct torque control strategy whose input is a torque control quantity.
  • the machine-side converter may be controlled by using a power closed-loop strategy and a second non-power control strategy together according to the fourth power control amount and the second non-power control amount, which is not limited here.
  • FIG3 is a schematic diagram of the logic architecture of an example of a wind turbine generator set current conversion control method provided by an embodiment of the present application.
  • the difference between the DC bus voltage set value Udc* and the DC bus voltage feedback value Udc is input into the proportional integral controller to obtain the power control amount ⁇ P*.
  • the power control amount ⁇ P* is compared with the energy storage power capacity range [Pbat_min, Pbat_max] of the energy storage device.
  • the first power control amount Pbat* is calculated according to the power capacity boundary value of the energy storage power capacity range [Pbat_min, Pbat_max].
  • the energy storage device Based on the difference between the first power control amount Pbat* and the power feedback value Pbat of the energy storage device, that is, the third power control amount, the energy storage device is controlled.
  • the difference between the power control amount ⁇ P* and the first power control amount Pbat* is determined as the second power control amount.
  • the sum of the machine-side power set value Pgen* of the machine-side converter and the second power control amount is used as the updated machine-side power set value.
  • the machine-side converter is controlled based on the difference between the updated machine-side power set value and the machine-side power feedback value Pgen.
  • a wind turbine generator set includes a machine-side converter and a grid-side converter, and the machine-side converter and the grid-side converter are electrically connected through a DC bus, and the DC bus is also connected to an energy storage device.
  • a power control amount can be obtained based on a DC bus voltage given value and a DC bus voltage feedback value.
  • the power control amount that the energy storage device can bear is preferentially allocated to the energy storage device, and a first power control amount is obtained from the power control amount for the energy storage device according to the power capacity boundary value of the energy storage power capacity range, and the energy storage device is controlled based on the first power control amount, and the energy storage device is preferentially made to provide inertia support for the power grid.
  • the second power control amount obtained by splitting the power control amount is used to control the machine-side converter so that the rotor kinetic energy of the wind turbine generator set provides another part of the inertia support for the power grid.
  • the energy storage device and the rotor kinetic energy jointly provide inertia support, minimize the inertia support provided by the rotor kinetic energy of the wind turbine generator set to the power grid, reduce or even avoid the situation where the fatigue load of the wind turbine generator set exceeds the limit, thereby improving the stability of the wind turbine generator set.
  • the energy storage device and the rotor kinetic energy can jointly provide inertia support.
  • the energy storage device can absorb energy to store and release the stored energy, which can ensure the stability of the DC bus voltage and avoid DC bus Faults caused by line overvoltage or undervoltage can also ensure the normal and stable power of wind turbines and ensure normal grid connection.
  • the energy storage device and rotor kinetic energy can jointly provide inertia support, the performance requirements of the energy storage device, such as energy storage ratio, can be appropriately reduced, thereby reducing the cost of the wind power generation system.
  • the grid-side power given value of the grid-side converter can be obtained based on the machine-side power given value before the machine-side converter is updated, and the grid-side converter can be controlled.
  • FIG4 is a flow chart of a wind turbine generator set current conversion control method provided by another embodiment of the present application. The difference between FIG4 and FIG2 is that the wind turbine generator set current conversion control method shown in FIG4 can also include step S205 and step S206.
  • step S205 based on the generator-side power set value of the generator-side converter before updating, a grid-side power set value of the grid-side converter is obtained.
  • the grid-side converter is connected to the machine-side converter via a DC bus, and a grid-side power given value of the grid-side converter can be determined based on a machine-side power given value before the machine-side converter is updated.
  • the machine-side power set value before the machine-side converter is updated can be determined as the grid-side power set value of the grid-side converter.
  • the machine-side power feedback value of the machine-side converter and the grid-side power feedback value of the grid-side converter can be obtained, and the first power difference between the machine-side power feedback value and the grid-side power feedback value can be calculated, and the difference between the machine-side power given value before the machine-side converter is updated and the first power difference is determined as the grid-side power given value of the converter.
  • the machine-side power feedback value is the actual power of the collected machine-side converter.
  • the grid-side power feedback value is the actual power of the collected grid-side converter.
  • the machine-side power feedback value and the first power difference with the grid-side power feedback value are equivalent to the inherent power loss between the machine-side converter and the grid-side converter.
  • the power loss will cause an imbalance in power on the DC bus, thereby triggering the energy storage device to release energy such as discharge to maintain the DC bus voltage stability.
  • the continuous release of energy by the energy storage device will affect the cycle life of the energy storage device.
  • the difference between the machine-side power set value before the machine-side converter is updated and the first power difference is the grid-side power set value after compensating for the power loss.
  • the grid-side converter is controlled based on the grid-side power set value after compensating for the power loss, thereby avoiding unnecessary power difference in the DC bus. It can also avoid the energy storage device from releasing extra energy.
  • the power loss can also be obtained by querying the power loss table based on the power segment of the machine-side power feedback value and the grid-side power feedback value, which is not limited here.
  • the more accurate the compensation of power loss in the embodiment of the present application the less the energy storage device needs to absorb and release energy, and the more guaranteed the protection of the cycle life of the energy storage device.
  • step S206 the grid-side converter is controlled based on the grid-side power set value and the collected grid-side power feedback value.
  • the difference between the grid-side power given value and the grid-side power feedback value can be calculated, and the grid-side converter can be controlled based on the difference using a preset control strategy.
  • the control strategy of the grid-side converter may include a power control strategy and/or a non-power control strategy.
  • the specific contents of the power control strategy and the non-power control strategy can be found in the relevant descriptions in the above embodiments, which will not be repeated here.
  • the control of the grid-side converter can be implemented by a voltage source control strategy or a current source control strategy.
  • the voltage source control strategy may include a virtual synchronous machine control strategy, a droop control strategy, etc., which are not limited here.
  • the current source control strategy cannot passively respond to the inertia support demand of the power grid.
  • the grid frequency can be actively collected and actively calculated according to the change of the grid frequency to actively respond to the inertia support demand of the power grid.
  • the power loss ⁇ Ploss* can be obtained according to the machine-side power feedback value Pgen and the grid-side power feedback value Pgrid, and the power loss ⁇ Ploss* is used for loss compensation.
  • the grid-side power given value of the grid-side converter can be the difference between the machine-side power given value Pgen* and the power loss ⁇ Ploss*.
  • the grid-side power given value refers to the grid-side active power given value
  • the grid-side power feedback value refers to the grid-side active power feedback value.
  • the difference between the grid-side power given value and the grid-side power feedback value Pgrid is calculated, and the difference between the grid-side reactive power given value Q* and the grid-side reactive power feedback value Q is calculated. Based on the difference between the grid-side power given value and the grid-side power feedback value Pgrid, and the difference between the grid-side reactive power given value Q* and the grid-side reactive power feedback value Q, the grid-side converter is controlled.
  • FIG5 is a flow chart of a method for controlling a current conversion of a wind turbine generator set provided in an embodiment. The difference between FIG5 and FIG4 is that the method for controlling a current conversion of a wind turbine generator set shown in FIG5 may further include step S207 and step S208.
  • step S207 based on the preset state of charge given range and the collected state of charge feedback value of the energy storage device, the state of charge power control amount is obtained.
  • the preset state of charge given range is an appropriate range of the state of charge that can ensure the safety and life of the energy storage device.
  • the operation state of the energy storage device within the state of charge given range is better than the operation state of the energy storage device outside the state of charge given range.
  • the state of charge feedback value can be the actual state of charge of the energy storage device collected.
  • the state of charge control amount can be obtained, and the state of charge control amount is the difference between a value within the state of charge given range and the state of charge feedback value, and then the state of charge control amount is converted into the state of charge power control amount.
  • the state of charge power control amount can be obtained by using a proportional integral differential method or a logical judgment method.
  • the state of charge power control amount is used to superimpose on the grid-side power given value to obtain an updated grid-side power given value.
  • a first state of charge difference between a preset first state of charge given value and a state of charge feedback value can be calculated, and a state of charge power control amount can be obtained based on the first state of charge difference, and the first state of charge given value is within a state of charge given range. That is, a value within the state of charge given range can be selected as the first state of charge given value, a first state of charge difference can be obtained based on the first state of charge, and then a state of charge power control amount can be obtained based on the first state of charge difference.
  • the state of charge of the energy storage device can be brought closer to the first state of charge given value, and the state of charge of the energy storage device can be adjusted through the grid-side converter control.
  • the state of charge is adjusted only when the state of charge is out of the range, which reduces the number of unnecessary state of charge adjustments, saves control resources, and simplifies the control process of the grid-side converter.
  • a value within the given range of the state of charge is selected as the second state of charge given value, and a second state of charge difference is obtained based on the second state of charge, and then the state of charge power control amount is obtained based on the second state of charge difference.
  • the state of charge of the energy storage device can be brought closer to the second state of charge given value, and the state of charge of the energy storage device can be adjusted by the grid-side converter control.
  • the steps of calculating the second state of charge difference and obtaining the state of charge power control amount according to the second state of charge difference are no longer performed.
  • step S208 the grid-side power set value and the power of the state-of-charge power control amount are added together to determine an updated grid-side power set value.
  • the charged power control amount is superimposed on the grid-side power given value to obtain an updated grid-side power given value.
  • the updated grid-side power given value has an additional deviation from the machine-side power given value. The additional deviation will cause the voltage of the DC bus to change.
  • the energy storage device will absorb or release energy, that is, charge or discharge, thereby adjusting the charge state of the energy storage device by controlling the grid-side converter.
  • the state-of-charge power control amount ⁇ Psoc* can be obtained according to the difference between the state-of-charge given value SOC* (which can be the first state-of-charge given value or the second state-of-charge given value) and the state-of-charge feedback value SOC.
  • the grid-side power given value of the grid-side converter is the difference between the generator-side power given value Pgen* and the power loss ⁇ Ploss*.
  • the state-of-charge power control amount ⁇ Psoc* is added to the grid-side power given value to obtain the updated grid-side power given value.
  • the difference between the updated grid-side power given value and the grid-side power feedback value Pgrid is calculated, and the difference between the grid-side reactive power given value Q* and the grid-side reactive power feedback value Q is calculated.
  • the grid-side converter is controlled.
  • FIG6 is a flow chart of a wind turbine generator set current conversion control method provided by another embodiment of the present application. The difference between FIG6 and FIG2 is that FIG6 The wind turbine generator set variable current control method shown in FIG6 may further include step S209.
  • step S209 when the power control amount is within the energy storage power capability range of the energy storage device, the energy storage device is controlled based on the power control amount.
  • the power control amount is within the energy storage power capacity of the energy storage device, which means that the energy storage device can independently provide the inertia support corresponding to the power control amount, and the energy storage device is given priority to provide inertia support for the power grid.
  • the process of inertia response is briefly described below.
  • the frequency of the power grid will fluctuate, causing the phase of the power grid to change.
  • the grid-side converter recognizes the phase change of the power grid, that is, the power angle change, and will provide active power for inertia support to suppress the frequency change of the power grid.
  • the grid-side converter provides active power, power changes will occur, and this power change will be transmitted to the DC bus, causing the voltage of the DC bus to fluctuate.
  • the voltage closed loop of the DC bus is controlled by the energy storage device by default, that is, the energy storage device responds preferentially to suppress the fluctuation of the DC bus. If the energy storage device is sufficient to suppress the fluctuation of the DC bus, that is, the power control amount is within the energy storage power capacity range of the energy storage device, then the inertia required to stabilize the DC bus voltage is provided by the energy storage device.
  • the power control amount provided by the energy storage device has reached the energy storage power capacity range of the energy storage device, but it still cannot stabilize the voltage of the DC bus, that is, the power control amount exceeds the energy storage power capacity range of the energy storage device, it is necessary to start the control of the machine-side converter, and the machine-side converter assists in stabilizing the voltage of the DC bus.
  • the inertia required to stabilize the DC bus voltage is provided jointly by the energy storage device and the rotor kinetic energy of the wind turbine generator set.
  • the energy storage device preferentially provides inertial support, thereby reducing the risk of excessive fatigue loads of the wind turbine generator set; the energy storage device and the rotor kinetic energy of the wind turbine generator set jointly provide inertial support, which can reduce the performance requirements for the energy storage device, select an energy storage device with a lower energy storage ratio, reduce the cost of the energy storage device, achieve a balance between the risk of excessive fatigue loads of the wind turbine generator set and the cost, and achieve a better current conversion control effect.
  • FIG7 is a structural schematic diagram of a wind turbine generator set current conversion control device provided by an embodiment of the present application.
  • the wind turbine generator set current conversion control device 300 may include a power control The control quantity calculation module 301, the power control quantity allocation module 302, the energy storage control module 303 and the machine side control module 304.
  • the power control amount calculation module 301 may be used to obtain the power control amount based on a given value of the DC bus voltage and a collected feedback value of the DC bus voltage.
  • the power control amount allocation module 302 can be used to determine a first power control amount and a second power control amount based on the power capacity boundary value of the energy storage power capacity range when the power control amount exceeds the energy storage power capacity range of the energy storage device, and the first power control amount corresponds to the power capacity boundary value.
  • the energy storage control module 303 may be used to control the energy storage device based on the first power control amount.
  • the machine-side control module 304 may be configured to determine a first sum of the second power control amount and the machine-side power set value of the machine-side converter as an updated machine-side power set value, and control the machine-side converter based on the updated machine-side power set value.
  • a wind turbine generator set includes a machine-side converter and a grid-side converter, and the machine-side converter and the grid-side converter are electrically connected through a DC bus, and the DC bus is also connected to an energy storage device.
  • a power control amount can be obtained based on a DC bus voltage given value and a DC bus voltage feedback value.
  • the power control amount that the energy storage device can bear is preferentially allocated to the energy storage device, and a first power control amount is obtained from the power control amount for the energy storage device according to the power capacity boundary value of the energy storage power capacity range, and the energy storage device is controlled based on the first power control amount, and the energy storage device is preferentially made to provide inertia support for the power grid.
  • the second power control amount obtained by splitting the power control amount is used to control the machine-side converter so that the rotor kinetic energy of the wind turbine generator set provides another part of the inertia support for the power grid.
  • the energy storage device and the rotor kinetic energy jointly provide inertia support, minimize the inertia support provided by the rotor kinetic energy of the wind turbine generator set to the power grid, reduce or even avoid the situation where the fatigue load of the wind turbine generator set exceeds the limit, thereby improving the stability of the wind turbine generator set.
  • the energy storage device and the rotor kinetic energy can jointly provide inertia support.
  • the energy storage device can absorb energy to store and release the stored energy. This can ensure the stability of the DC bus voltage, avoid failures caused by DC bus overvoltage or undervoltage, and ensure the normal power stability of the wind turbine generator set and the normal grid connection.
  • the energy storage device and the rotor kinetic energy can jointly provide inertia support, the requirements for the performance of the energy storage device, such as the energy storage ratio, can also be appropriately reduced, thereby reducing the wind power generation system. system costs.
  • the energy storage control module 303 can be used to: obtain a third power control quantity based on the first power control quantity and the collected power feedback value of the energy storage device; control the energy storage device using a power closed-loop strategy based on the third power control quantity, and/or convert the third power control quantity into a first non-power control quantity, and control the energy storage device using a first non-power control strategy based on the first non-power control quantity, the first non-power control quantity includes a non-power control quantity, and the input of the first non-power control strategy is the non-power control quantity.
  • the machine-side control module 304 can be used to: obtain a fourth power control quantity based on an updated machine-side power set value and a collected machine-side power feedback value; control the machine-side converter based on the fourth power control quantity using a power closed-loop strategy, and/or convert the fourth power control quantity into a second non-power control quantity; and control the machine-side converter based on the second non-power control quantity using a second non-power control strategy, wherein the second non-power control quantity includes a non-power control quantity, and the input of the second non-power control strategy is a non-power control quantity.
  • FIG8 is a schematic structural diagram of a wind turbine generator set current conversion control device provided in another embodiment of the present application.
  • the difference between FIG8 and FIG7 is that the wind turbine generator set current conversion control device 300 shown in FIG8 may further include a grid-side control module 305 .
  • the grid-side control module 305 can be used to: obtain the grid-side power given value of the grid-side converter based on the machine-side power given value before the machine-side converter is updated; and control the grid-side converter based on the grid-side power given value and the collected grid-side power feedback value.
  • the grid-side control module 305 can be used to: determine the machine-side power set value before the machine-side converter is updated as the grid-side power set value of the grid-side converter; or, obtain the machine-side power feedback value of the machine-side converter and the grid-side power feedback value of the grid-side converter, calculate a first power difference between the machine-side power feedback value and the grid-side power feedback value, and determine the difference between the machine-side power set value before the machine-side converter is updated and the first power difference as the grid-side power set value of the converter.
  • FIG9 is a schematic structural diagram of a wind turbine generator set current conversion control device provided in another embodiment of the present application.
  • the difference between FIG9 and FIG8 is that the wind turbine generator set current conversion control device 300 shown in FIG8 may further include a charge state control module 306 .
  • the state of charge control module 306 can be used to: obtain the SOC power control amount based on the preset state of charge SOC given range and the collected SOC feedback value of the energy storage device; set the grid-side power given The sum of the power of the SOC power control value and the power of the SOC power control amount is determined as the updated grid-side power given value.
  • the state of charge control module 306 may be used to calculate a first SOC difference between a preset first SOC given value and a SOC feedback value, obtain an SOC power control amount according to the first SOC difference, and the first SOC given value is within a SOC given range.
  • the state of charge control module 306 can be used to: determine whether the SOC feedback value is within the SOC given range, and when the SOC feedback value is outside the SOC given range, calculate a second SOC difference between a preset second SOC given value and the SOC feedback value, and obtain the SOC power control amount based on the second SOC difference, and the second SOC given value is within the SOC given range.
  • the energy storage control module 303 may also be used to control the energy storage device based on the power control amount when the power control amount is within the energy storage power capability range of the energy storage device.
  • the third aspect of the present application also provides a wind turbine current conversion control device, which can be implemented as a wind turbine current conversion controller or other devices that can control the current conversion process of the wind turbine, which is not limited here.
  • Figure 10 is a structural schematic diagram of a wind turbine current conversion control device provided by an embodiment of the present application. As shown in Figure 10, the wind turbine current conversion control device 400 includes a memory 401, a processor 402, and a computer program stored in the memory 401 and executable on the processor 402.
  • the processor 402 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the memory 401 may include a read-only memory (ROM), a random access memory (RAM), a disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical/tangible memory storage device. Therefore, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer executable instructions, and when the software is executed (e.g., by one or more processors), it can be operated to perform the operations described with reference to the wind turbine generator set inverter control method according to the embodiment of the present application.
  • ROM read-only memory
  • RAM random access memory
  • the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer executable instructions, and when the software is executed (e.g., by one or more processors), it can be operated to perform the operations described with reference to the wind turbine generator set inverter control method according to the embodiment of
  • the processor 402 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 401 , so as to implement the wind turbine generator set current conversion control method in the above embodiment.
  • the wind turbine generator set current conversion control device 400 may further include a communication interface 403 and a bus 404. As shown in FIG10 , the memory 401, the processor 402, and the communication interface 403 are connected via the bus 404 and communicate with each other.
  • the communication interface 403 is mainly used to realize the communication between the modules, devices, units and/or equipment in the embodiment of the present application.
  • the communication interface 403 can also be used to access input devices and/or output devices.
  • the bus 404 includes hardware, software, or both, coupling the components of the wind turbine generator set inverter control device 400 to each other.
  • the bus 404 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus,
  • AGP Accelerated Graphics Port
  • EISA Enhanced Industry Standard Architecture
  • FFB Front Side Bus
  • HT Hyper Transport
  • ISA Industry Standard Architecture
  • ISA Industry Standard Architecture
  • LPC Low Pin Count
  • the bus 404 may include one or more buses.
  • the bus 404 may include a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of the above.
  • MCA Micro Channel Architecture
  • PCI Peripheral Component Interconnect
  • PCI-E PCI-Express
  • SATA Serial Advanced Technology Attachment
  • VLB Video Electronics Standards Association Local Bus
  • the fourth aspect of the present application provides a wind power generation system, which may include the wind turbine generator set, energy storage device and wind turbine generator set current conversion control device in the above-mentioned embodiment.
  • the architecture of the wind turbine generator set and the energy storage device can be seen in Figure 1, which will not be repeated here.
  • the wind turbine generator set current conversion control device can execute the wind turbine generator set current conversion control method in the above-mentioned embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
  • the present application also provides a computer-readable storage medium having computer program instructions stored thereon.
  • the wind turbine generator set current conversion control method in the above embodiments can achieve the same technical effect, and will not be described here to avoid repetition.
  • the above computer-readable storage medium may include a non-transitory computer-readable storage medium, such as a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc., which is not limited here.
  • the embodiments of the present application may also provide a computer program product.
  • the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the wind turbine generator set current conversion control method in the above embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
  • each square box in the flow chart and/or the block diagram and the combination of each square box in the flow chart and/or the block diagram can be realized by computer program instructions.
  • These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the realization of the function/action specified in one or more square boxes of the flow chart and/or the block diagram.
  • a processor can be but is not limited to a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit.
  • each square box in the block diagram and/or the flow chart and the combination of the square boxes in the block diagram and/or the flow chart can also be realized by the dedicated

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Abstract

本申请公开了一种风力发电机组变流控制方法、装置、设备及风力发电系统，属于风力发电领域。该方法包括：基于直流母线电压给定值和采集的直流母线电压反馈值，得到功率控制量；在功率控制量超出储能装置的储能功率能力范围的情况下，根据储能功率能力范围的功率能力边界值，将功率控制量拆分为第一功率控制量和第二功率控制量，第一功率控制量与功率能力边界值对应；基于第一功率控制量对储能装置进行控制；将第二功率控制量与机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于更新后的机侧功率给定值对机侧变流器进行控制。

Description

风力发电机组变流控制方法、装置、设备及风力发电系统
相关申请的交叉引用
本申请要求享有于2022年12月21日提交的名称为“风力发电机组变流控制方法、装置、设备及风力发电系统”的中国专利申请202211647101.9的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请属于风力发电领域，尤其涉及一种风力发电机组变流控制方法、装置、设备及风力发电系统。
背景技术
风力发电机组是一种能够将风能转化为电能的装置。风力发电机组产生的电能可通过输电网络传输至电网，以供电网分配使用。随着风力发电技术的发展，在电网出现频率大幅度变化的情况下，可利用风力发电机组中发电机的转子动能为电网提供惯量支撑。但依靠风力发电机组中发电机的转子动能为电网提供惯量支撑，风力发电机组会出现疲劳载荷超限的情况，从而降低风力发电机组的稳定性。
发明内容
本申请实施例提供一种风力发电机组变流控制方法、装置、设备及风力发电系统，能够提高风力发电机组的稳定性。
第一方面，本申请实施例提供一种风力发电机组变流控制方法，应用于风力发电机组，风力发电机组包括机侧变流器和网侧变流器，网侧变流器通过直流母线与机侧变流器电连接，直流母线还电连接有储能装置，该方法包括：基于直流母线电压给定值和采集的直流母线电压反馈值，得到功率控制量；在功率控制量超出储能装置的储能功率能力范围的情况下， 基于储能功率能力范围的功率能力边界值，根据功率控制量确定第一功率控制量和第二功率控制量，第一功率控制量与功率能力边界值对应；基于第一功率控制量对储能装置进行控制；将第二功率控制量与机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于更新后的机侧功率给定值对机侧变流器进行控制。
第二方面，本申请实施例提供一种风力发电机组变流控制装置，应用于风力发电机组，风力发电机组包括机侧变流器和网侧变流器，网侧变流器通过直流母线与机侧变流器电连接，直流母线还电连接有储能装置，该装置包括：功率控制量计算模块，用于基于直流母线电压给定值和采集的直流母线电压反馈值，得到功率控制量；功率控制量分配模块，用于在功率控制量超出储能装置的储能功率能力范围的情况下，基于储能功率能力范围的功率能力边界值，根据功率控制量确定第一功率控制量和第二功率控制量，第一功率控制量与功率能力边界值对应；储能控制模块，用于基于第一功率控制量对储能装置进行控制；机侧控制模块，用于将第二功率控制量与机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于更新后的机侧功率给定值对机侧变流器进行控制。
第三方面，本申请实施例提供一种风力发电机组变流控制设备，包括：处理器以及存储有计算机程序指令的存储器；处理器执行计算机程序指令时实现第一方面的风力发电机组变流控制方法。
第四方面，本申请实施例提供一种风力发电系统，包括：风力发电机组，包括机侧变流器和网侧变流器，网侧变流器通过直流母线与机侧变流器电连接；储能装置，与直流母线电连接；第三方面中的风力发电机组变流控制设备。
本申请实施例提供一种风力发电机组变流控制方法、装置、设备及风力发电系统，风力发电机组包括机侧变流器和网侧变流器，机侧变流器和网侧变流器之间通过直流母线电连接，直流母线还连接有储能装置。可基于直流母线电压给定值和直流母线电压反馈值得到功率控制量。在功率控制量超出储能装置的储能功率能力范围的情况下，优先为储能装置分配储能装置能够承载的功率控制量，按照储能功率能力范围的功率能力边界 值，为储能装置从功率控制量中拆分得到第一功率控制量，并基于第一功率控制量对储能装置进行控制，优先使储能装置为电网提供惯量支撑。功率控制量拆分得到的第二功率控制量用于进行机侧变流器的控制，以使风力发电机组的转子动能为电网提供另一部分惯量支撑。储能装置与转子动能共同提供惯量支撑，尽量减少风力发电机组的转子动能为电网提供的惯量支撑，减少甚至避免风力发电机组出现疲劳载荷超限的情况，从而提高风力发电机组的稳定性。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单的介绍，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请一实施例提供的风力发电系统的架构示意图；
图2为本申请一实施例提供的风力发电机组变流控制方法的流程图；
图3为本申请实施例提供的风力发电机组变流控制方法的一示例的逻辑架构示意图；
图4为本申请另一实施例提供的风力发电机组变流控制方法的流程图；
图5为本申请又一实施例提供的风力发电机组变流控制方法的流程图；
图6为本申请再一实施例提供的风力发电机组变流控制方法的流程图；
图7为本申请一实施例提供的风力发电机组变流控制装置的结构示意图；
图8为本申请另一实施例提供的风力发电机组变流控制装置的结构示意图；
图9为本申请另一实施例提供的风力发电机组变流控制装置的结构示意图；
图10为本申请一实施例提供的风力发电机组变流控制设备的结构示 意图。
具体实施方式
下面将详细描述本申请的各个方面的特征和示例性实施例，为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及具体实施例，对本申请进行进一步详细描述。应理解，此处所描述的具体实施例仅意在解释本申请，而不是限定本申请。对于本领域技术人员来说，本申请可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本申请的示例来提供对本申请更好的理解。
风力发电机组是一种能够将风能转化为电能的装置。风力发电机组产生的电能可通过输电网络传输至电网，以供电网分配使用。随着风力发电技术的发展，在电网出现频率大幅度变化的情况下，可利用风力发电机组中发电机的转子动能为电网提供惯量支撑。但依靠风力发电机组中发电机的转子动能为电网提供惯量支撑，风力发电机组会出现疲劳载荷超限的情况，从而降低风力发电机组的稳定性。
本申请实施例提供一种风力发电机组变流控制方法、装置、设备及风力发电系统，应用于风力发电机组，该风力发电机组中机侧变流器和网侧变流器之间的直流母线可连接有储能装置，储能装置也能够为电网提供惯量支撑。可基于直流母线的电压参数得到功率控制量，在功率控制量超出储能装置的储能功率能力范围的情况下，根据储能装置的功率能力，将控制控制量拆分为两部分，一部分用于储能装置控制，使储能装置提供惯量支撑，另一部分用于机侧变流器控制，使风力发电机组的转子动能提供惯量支撑。储能装置与转子动能共同提供惯量支撑，尽量减少发电机的转子动能为电网提供的惯量支撑，减少甚至避免风力发电机组出现疲劳载荷超限的情况，从而提高风力发电机组的稳定性。
下面对本申请提供的风力发电机组变流控制方法、装置、设备及风力发电系统分别进行介绍。
为了便于理解，这里对本申请实施例中风力发电系统的架构先进行简单的说明。图1为本申请一实施例提供的风力发电系统的架构示意图，如 图1所示，风力发电机组包括机侧变流器11和网侧变流器13，网侧变流器13通过直流母线12与所述机侧变流器11电连接，直流母线12还连接有储能装置14。
机侧变流器11可用于将风力发电机组的发电机输出的交流电能转换为直流电能，并输出至直流母线12。在此并不限定机侧变流器11的类型。
网侧变流器13可用于将直流母线12传输来的直流电能转换为交流电能并输出。在此并不限定网侧变流器13的类型。网侧变流器13可与电网15电连接，网侧变流器13与电网15之间还可包括其他装置，在此并不限定，例如，网侧变流器13与电网15之间可设置变压器16。
储能装置14连接于直流母线12。储能装置14可包括但不限于电池、飞轮装置等能够储能和放能的装置。储能装置14的储能容量可根据风力发电机组和电网15所处的场景、需求等选定，在此并不限定。在本申请实施例中，在电网15的频率下降时，储能装置14可释放能量；在电网15的频率上升时，储能装置14可吸收能量并存储，也可释放存储的能量。在一些实施例中，如图1所示，储能装置14可包括能量转换器141和储能器件142，能量转换器141和储能器件142的类型在此并不限定。例如，能量转换器141可为直流-直流转换器，储能器件142可为电池。
在本申请实施例的风力发电系统中，储能装置14与转子动能共同协作为电网15提供惯量支持，可降低对储能装置14的充放电倍率、能量密度等性能方面的要求，从而降低储能装置14的成本，采用储能性能较低的储能装置14也能够满足为电网提供惯量支撑的需求，保证风力发电系统的稳定性。
本申请第一方面提供一种风力发电机组变流控制方法，可应用于上述实施例中的风力发电机组以及风力发电系统，该风力发电机组变流控制方法可由风力发电变流控制装置、设备等执行。图2为本申请一实施例提供的风力发电机组变流控制方法的流程图，如图2所示，该风力发电机组变流控制方法可包括步骤S201至步骤S204。
在步骤S201中，基于直流母线电压给定值和采集的直流母线电压反 馈值，得到功率控制量。
直流母线电压给定值为直流母线的电压的一预设值，可根据场景、需求等设定。直流母线电压反馈值为采集的直流母线实际的电压值。可先计算直流母线电压给定值与直流母线电压反馈值的差值，对该差值进行比例积分处理，如将该差值输入比例积分控制器即PI控制器，得到功率控制量。功率控制量用于对储能装置和机侧变流器进行控制，或者，用于对储能装置进行控制。
在步骤S202中，在功率控制量超出储能装置的储能功率能力范围的情况下，基于储能功率能力范围的功率能力边界值，根据功率控制量确定第一功率控制量和第二功率控制量。
可比较功率控制量和储能装置的储能功率能力范围。功率控制量超出储能装置的储能功率能力范围，表示储能装置难以单独提供功率控制量所对应的惯量支撑；功率控制量在储能装置的储能功率能力范围内，表示储能装置能够单独提供功率控制量所对应的惯量支撑。
在功率控制量超出储能装置的储能功率能力范围的情况下，可将功率控制量拆分为两部分，即第一功率控制量和第二功率控制量。第一功率控制量用于对储能装置进行控制，与功率能力边界值对应。第二功率控制量用于对机侧变流器进行控制。在本申请实施例中优先由储能装置为电网提供惯量支撑，根据储能功率能力范围的功率能力边界值来得到第一功率控制量。在一些示例中，储能功率能力范围的功率能力边界值可包括储能功率能力范围的最大放电功率或最大充电功率。在电网的频率下降时，储能功率能力范围的功率能力边界值为储能功率能力范围的最大放电功率；在电网的频率上升时，储能功率能力范围的功率能力边界值为储能功率能力范围的最大充电功率。
第一功率控制量和第二功率控制量的加和为功率控制量，也就是说，得到第一功率控制量后，可计算得到功率控制量与第一功率控制量的差值，将该差值确定为第二功率控制量。
在步骤S203中，基于第一功率控制量对储能装置进行控制。
可获取储能装置的功率反馈值，利用预设的控制策略，基于第一功率 控制量和功率反馈值，对储能装置进行控制。用于储能装置的控制策略可包括功率类控制策略和/或非功率类控制策略，在此并不限定。功率类控制策略的输入可包括功率的控制量，功率类控制策略的输入可包括第一功率控制量与功率反馈值的功率差。例如，功率类控制策略可包括功率闭环策略等以功率的控制量直接作为输入的控制策略。非功率类控制策略可包括电流闭环策略等以非功率的控制量作为输入的控制策略，非功率类控制策略的输入可基于功率的控制量转换得到。
在一些示例中，根据第一功率控制量和采集的储能装置功率反馈值，得到第三功率控制量；根据第三功率控制量，利用功率闭环策略对储能装置进行控制。储能装置功率反馈值为采集的储能装置实际的功率。第三功率控制链可为第一功率控制量和储能装置功率反馈值的差值。第三功率控制量可作为功率闭环策略的输入，基于功率闭环策略控制储能模块进行能量存储或能量释放。
在一些示例中，根据第一功率控制量和采集的储能装置功率反馈值，得到第三功率控制量；将第三功率控制量转换为第一非功率控制量，根据第一非功率控制量，利用第一非功率类控制策略对储能装置进行控制。第三功率控制量的内容可参见上述实施例中的相关说明，在此不在赘述。第一非功率控制量包括非功率的控制量。第一非功率类控制策略的输入为非功率的控制量。在本申请实施例中，第一非功率类控制策略的输入为第一非功率控制量。例如，第一非功率控制量包括电流控制量，第一非功率类控制策略可包括电流闭环策略等输入为电流控制量的控制策略。
在一些示例中，也可根据第一功率控制量和第一非功率控制量，共同利用功率闭环策略和第一非功率类控制策略对储能装置进行控制。例如，可根据第一功率控制量和由第一功率控制量转换得到的电流控制量，内环采用电流闭环策略，外环采用功率闭环策略，对储能值进行控制。
在步骤S204中，将第二功率控制量与机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于更新后的机侧功率给定值对机侧变流器进行控制。
风力发电机组的转子动能除了提供与自身原有的机侧功率给定值对应 的惯量支撑以外，还需提供与分配至机侧变流器的第二功率控制量对应的惯量支撑。机侧功率给定值为机侧变流器的功率的一预设值，可根据场景、需求等设定。可将第二功率控制量与机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，更新后的机侧功率给定值对应的惯量为与自身原有的机侧功率给定值对应的惯量和第二功率控制量对应的惯量的加和。
可利用预设的控制策略，基于更新后的机侧功率给定值和机侧功率反馈值，对机侧变流器进行控制。用于机侧变流器的控制策略可包括功率类控制策略和/或非功率类控制策略，在此并不限定。功率类控制策略的输入可包括功率的控制量，例如，功率类控制策略可包括功率闭环控制策略等以功率的控制量直接作为输入的控制策略。非功率类控制策略可包括矢量控制、直接转矩控制等以非功率的控制量作为输入的控制策略，非功率类控制策略的输入可基于功率的控制量转换得到。
在一些示例中，可根据更新后的机侧功率给定值和采集的机侧功率反馈值，得到第四功率控制量，根据第四功率控制量，利用功率闭环策略对机侧变流器进行控制。机侧功率反馈值为采集的机侧变流器实际的功率。第四功率控制量可为更新后的机侧功率给定值与机侧功率反馈值的差值。第四功率控制量可作为功率闭环策略的输入，基于功率闭环策略控制机侧变流器，从而控制风力发电机组的转子动能提供的惯量支撑。
在一些示例中，可根据更新后的机侧功率给定值和采集的机侧功率反馈值，得到第四功率控制量，将第四功率控制量转换为第二非功率控制量，根据第二非功率控制量，利用第二非功率类控制策略对机侧变流器进行控制。第四功率控制量的内容可参见上述实施例中的相关说明，在此不在赘述。第二非功率控制量包括非功率的控制量，第二非功率类控制策略的输入为非功率的控制量。在本申请实施例中，第二非功率类控制策略的输入为第二非功率控制量。例如，第二非功率控制量包括电流控制量，第二非功率类控制策略可包括矢量控制策略等输入为电流控制量的控制策略。又例如，第二非功率控制量包括转矩控制量，第二非功率类控制策略可包括直接转矩控制策略等输入为转矩控制量的控制策略。
在一些示例中，也可根据第四功率控制量和第二非功率控制量，共同利用功率闭环策略和第二非功率类控制策略对机侧变流器进行控制，在此并不限定。
图3为本申请实施例提供的风力发电机组变流控制方法的一示例的逻辑架构示意图。如图3所示，直流母线电压给定值Udc*和直流母线电压反馈值Udc的差值输入比例积分控制器，得到功率控制量ΔP*。功率控制量ΔP*与储能装置的储能功率能力范围[Pbat_min，Pbat_max]比较，在功率控制量ΔP*超出储能功率能力范围[Pbat_min，Pbat_max]的情况下，根据储能功率能力范围[Pbat_min，Pbat_max]的功率能力边界值，计算得到第一功率控制量Pbat*。基于第一功率控制量Pbat*和储能装置功率反馈值Pbat的差值即第三功率控制量，对储能装置进行控制。将功率控制量ΔP*与第一功率控制量Pbat*的差值确定为第二功率控制量。将机侧变流器的机侧功率给定值Pgen*与第二功率控制量的加和作为更新后的机侧功率给定值。基于更新后的机侧功率给定值与机侧功率反馈值Pgen的差值，对机侧变流器进行控制。
在本申请实施例中，风力发电机组包括机侧变流器和网侧变流器，机侧变流器和网侧变流器之间通过直流母线电连接，直流母线还连接有储能装置。可基于直流母线电压给定值和直流母线电压反馈值得到功率控制量。在功率控制量超出储能装置的储能功率能力范围的情况下，优先为储能装置分配储能装置能够承载的功率控制量，按照储能功率能力范围的功率能力边界值，为储能装置从功率控制量中拆分得到第一功率控制量，并基于第一功率控制量对储能装置进行控制，优先使储能装置为电网提供惯量支撑。功率控制量拆分得到的第二功率控制量用于进行机侧变流器的控制，以使风力发电机组的转子动能为电网提供另一部分惯量支撑。储能装置与转子动能共同提供惯量支撑，尽量减少风力发电机组的转子动能为电网提供的惯量支撑，减少甚至避免风力发电机组出现疲劳载荷超限的情况，从而提高风力发电机组的稳定性。
储能装置与转子动能可共同提供惯量支撑，储能装置可吸收能量以存储也可释放存储的能量的特性，能够保证直流母线电压稳定，避免直流母 线过压或欠压导致的故障，也能够保证风力发电机组的功率正常稳定，保证并网正常。而且，由于储能装置与转子动能可共同提供惯量支撑，也可适当降低对储能装置的如储能倍率等的性能的要求，从而降低风力发电系统的成本。
在一些实施例中，可基于机侧变流器更新前的机侧功率给定值，得到网侧变流器的网侧功率给定值，并对网侧变流器进行控制。图4为本申请另一实施例提供的风力发电机组变流控制方法的流程图，图4与图2的不同之处在于，图4所示的风力发电机组变流控制方法还可包括步骤S205和步骤S206。
在步骤S205中，基于机侧变流器更新前的机侧功率给定值，得到网侧变流器的网侧功率给定值。
网侧变流器通过直流母线与机侧变流器连接，网侧变流器的网侧功率给定值可基于机侧变流器更新前的机侧功率给定值确定。
在一些示例中，在储能装置具有保证直流母线电压稳定的能力且不考虑机侧变流器的功率与网侧变流器的功率的偏差的情况下，可将机侧变流器更新前的机侧功率给定值确定为网侧变流器的网侧功率给定值。
在另一些示例中，可获取机侧变流器的机侧功率反馈值和网侧变流器的网侧功率反馈值，计算得到机侧功率反馈值与网侧功率反馈值的第一功率差，基于机侧变流器更新前的机侧功率给定值与第一功率差的差值确定为变流器的网侧功率给定值。机侧功率反馈值为采集的机侧变流器的实际功率。网侧功率反馈值为采集的网侧变流器的实际功率。需要说明的是，这里的“采集”可包括主动采集数据和被动采集数据，被动采集数据指数据被采集方主动反馈数据。机侧功率反馈值和与网侧功率反馈值的第一功率差相当于机侧变流器与网侧变流器之间固有的功率损耗，该功率损耗会引发直流母线上功率的不平衡，进而触发储能装置释放能量如放电，来维持直流母线电压稳定。储能装置持续释放能量，会影响储能装置的循环寿命。这里将机侧变流器更新前的机侧功率给定值与第一功率差的差值即为补偿损耗功率后的网侧功率给定值，基于该补偿损耗功率后的网侧功率给定值对网侧变流器进行控制，可以避免直流母线出现不必要的功率差额， 也可避免储能装置额外释放能量。在一些情况下，也可基于机侧功率反馈值和网侧功率反馈值的功率段查询功率损耗表得到功率损耗，在此并不限定。本申请实施例中功率损耗的补偿越精准，储能装置吸收能量、释放能量的需求越少，对储能装置的循环寿命的保护越有保证。
在步骤S206中，基于网侧功率给定值和采集的网侧功率反馈值，对网侧变流器进行控制。
可计算得到网侧功率给定值和网侧功率反馈值的差值，利用预设的控制策略，基于该差值，对网侧变流器进行控制。网侧变流器的控制策略可包括功率类控制策略和/或非功率类控制策略，功率类控制策略和非功率类控制策略的具体内容可参见上述实施例中的相关说明，在此不再赘述。对网侧变流器的控制可采用电压源控制策略或电流源控制策略等实现。电压源控制策略可包括虚拟同步机控制策略、下垂控制策略等，在此并不限定。其中，电流源控制策略不能被动响应电网的惯量支撑需求，在采用电流源控制策略控制网侧变流器的情况下，可主动采集电网频率，根据电网频率的变化主动计算，以主动响应电网的惯量支撑需求。
可参见图3中与网侧变流器控制相关的部分，如图3所示，可根据机侧功率反馈值Pgen与网侧功率反馈值Pgrid，得到功率损耗ΔPloss*，利用功率损耗ΔPloss*进行损耗补偿，网侧变流器的网侧功率给定值可为机侧功率给定值Pgen*与功率损耗ΔPloss*的差值。网侧功率给定值指的是网侧有功功率给定值，网侧功率反馈值指的是网侧有功功率反馈值。计算得到网侧功率给定值与网侧功率反馈值Pgrid的差值，计算得到网侧无功功率给定值Q*与网侧无功功率反馈值Q的差值，基于网侧功率给定值与网侧功率反馈值Pgrid的差值，以及网侧无功功率给定值Q*与网侧无功功率反馈值Q的差值，对网侧变流器进行控制。
储能装置在稳定直流母线的电压的过程中，尽管通过功率损耗补偿的方式可减少储能装置吸收能量、释放能量的需求即充、放电的需求，但储能装置只要处于运行状态，储能装置的荷电状态(State of Charge，SOC)就会发生变化。为了保障存储装置的安全以及寿命，可进行储能装置的荷电状态管理，使储能装置在合理的荷电状态范围内运行。图5为本申请又 一实施例提供的风力发电机组变流控制方法的流程图，图5与图4的不同之处在于，图5所示的风力发电机组变流控制方法还可包括步骤S207和步骤S208。
在步骤S207中，基于预设的荷电状态给定范围和采集的储能装置的荷电状态反馈值，得到荷电状态功率控制量。
预设的荷电状态给定范围为能够保障储能装置的安全与寿命的荷电状态的适宜范围。储能装置的荷电状态在荷电状态给定范围内的运行状态优于能装置的荷电状态在荷电状态给定范围外的运行状态。荷电状态反馈值可为采集的储能装置实际的荷电状态。
可基于荷电状态给定范围和荷电状态反馈值的，得到荷电状态控制量，荷电状态控制量为荷电状态给定范围内的一个值与荷电状态反馈值的差值，再将荷电状态控制量转换为荷电状态功率控制量。例如，可基于荷电状态控制量，利用比例积分微分方式或逻辑判断等方式得到荷电状态功率控制量。荷电状态功率控制量用于叠加于网侧功率给定值，得到更新后的网侧功率给定值。
在一些示例中，可计算得到预设的第一荷电状态给定值与荷电状态反馈值的第一荷电状态差值，根据第一荷电状态差值，得到荷电状态功率控制量，第一荷电状态给定值位于荷电状态给定范围内。即，可选定荷电状态给定范围内的一个值作为第一荷电状态给定值，基于该第一荷电状态得到第一荷电状态差值，再基于第一荷电状态差值得到荷电状态功率控制量。通过该荷电状态功率控制量作用于网侧变流器控制，可使储能装置的荷电状态向第一荷电状态给定值靠拢，通过网侧变流器控制实现对储能装置的荷电状态的调节。
在另一些示例中，可判断荷电状态反馈值是否位于荷电状态给定范围内，在荷电状态反馈值位于荷电状态给定范围外的情况下，计算得到预设的第二荷电状态给定值与荷电状态反馈值的第二荷电状态差值，根据第二荷电状态差值，得到荷电状态功率控制量，第二荷电状态给定值位于荷电状态给定范围内。在本示例中，荷电状态反馈值位于荷电状态给定范围内，不需对荷电状态进行调节，只有在荷电状态反馈值位于荷电状态给定 范围外的情况下，才对荷电状态进行调节，减少不必要的荷电状态调节次数，节省控制资源，简化网侧变流器的控制流程。选定荷电状态给定范围内的一个值作为第二荷电状态给定值，基于该第二荷电状态得到第二荷电状态差值，再基于第二荷电状态差值得到荷电状态功率控制量。通过该荷电状态功率控制量作用于网侧变流器控制，可使储能装置的荷电状态向第二荷电状态给定值靠拢，通过网侧变流器控制实现对储能装置的荷电状态的调节。在储能装置的荷电状态进入荷电状态给定范围时，可不再执行计算得到第二荷电状态差值、根据第二荷电状态差值得到荷电状态功率控制量等步骤。
在步骤S208中，将网侧功率给定值与荷电状态功率控制量的功率加和确定为更新后的网侧功率给定值。
将荷电功率控制量叠加值网侧功率给定值，得到更新后的网侧功率给定值，更新后的网侧功率给定值比机侧功率给定值产生额外偏差，该额外偏差会引起直流母线的电压发生变化，储能装置为了稳定直流母线电压会吸收能量或释放能量即充电或放电，从而通过对网侧变流器的控制实现对储能装置的荷电状态的调节。
可参见图3中与网侧变流器的控制相关的部分，如图3所示，可根据荷电状态给定值SOC*(可为上述第一荷电状态给定值或第二荷电状态给定值)和荷电状态反馈值SOC的差值，得到荷电状态功率控制量ΔPsoc*，网侧变流器的网侧功率给定值为机侧功率给定值Pgen*与功率损耗ΔPloss*的差值，将荷电状态功率控制量ΔPsoc*叠加至网侧功率给定值，得到更新后的网侧功率给定值。计算得到更新后的网侧功率给定值与网侧功率反馈值Pgrid的差值，计算得到网侧无功功率给定值Q*与网侧无功功率反馈值Q的差值，基于更新后的网侧功率给定值与网侧功率反馈值Pgrid的差值，以及网侧无功功率给定值Q*与网侧无功功率反馈值Q的差值，对网侧变流器进行控制。
在本申请实施例中，为了降低风力疲劳载荷超限的风险，优先控制储能装置，由储能装置为电网提供惯量支撑。图6为本申请再一实施例提供的风力发电机组变流控制方法的流程图，图6与图2的不同之处在于，图 6所示的风力发电机组变流控制方法还可包括步骤S209。
在步骤S209中，在功率控制量位于储能装置的储能功率能力范围的情况下，基于功率控制量对储能装置进行控制。
功率控制量位于储能装置的储能功率能力范围内，表示储能装置可单独提供功率控制量所对应的惯量支撑，优先由储能装置为电网提供惯量支撑。
为了便于理解储能装置，或者储能装置和风力发电机组的转子动能共同为电网提供惯量支撑即惯量响应的过程，下面简单对惯量响应的过程进行说明。在一些情况下，电网频率会发生波动，使得电网的相位发生变化。网侧变流器识别到电网的相位变化即功角变化，会提供有功功率进行惯量支撑，抑制电网的频率变化。网侧变流器提供有功功率会发生功率变化，这种功率变化会传递到直流母线，导致直流母线的电压发生波动。在本申请实施例中，直流母线的电压闭环默认由储能装置负责控制，即储能装置优先响应以抑制直流母线的波动。若储能装置足以抑制直流母线的波动即功率控制量位于储能装置的储能功率能力范围，则稳定直流母线电压所需的惯量由储能装置提供。若储能装置提供的功率控制量已经达到储能装置的储能功率能力范围，但仍然无法稳定直流母线的电压，即，功率控制量超出储能装置的储能功率能力范围，则需要启动机侧变流器的控制，由机侧变流器辅助稳定直流母线的电压，稳定直流母线电压所需的惯量由储能装置和风力发电机组的转子动能联合提供。
本申请实施例由储能装置优先提供惯性支撑，减小风力发电机组疲劳载荷超限风险；储能装置和风力发电机组的转子动能共同提供惯性支撑，可降低对储能装置的性能要求，选用较低储能倍率的储能装置，降低储能装置的成本，实现风力发电机组的疲劳载荷超限风险和成本的平衡，达到更好的变流控制效果。
本申请第二方面提供一种风力发电机组变流控制装置，应用于风力发电机组，风力发电机组的具体内容可参见上述实施例中的相关说明，在此不再赘述。图7为本申请一实施例提供的风力发电机组变流控制装置的结构示意图，如图7所示，该风力发电机组变流控制装置300可包括功率控 制量计算模块301、功率控制量分配模块302、储能控制模块303和机侧控制模块304。
功率控制量计算模块301可用于基于直流母线电压给定值和采集的直流母线电压反馈值，得到功率控制量。
功率控制量分配模块302可用于在功率控制量超出储能装置的储能功率能力范围的情况下，基于储能功率能力范围的功率能力边界值，根据功率控制量确定第一功率控制量和第二功率控制量，第一功率控制量与功率能力边界值对应。
储能控制模块303可用于基于第一功率控制量对储能装置进行控制。
机侧控制模块304可用于将第二功率控制量与机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于更新后的机侧功率给定值对机侧变流器进行控制。
在本申请实施例中，风力发电机组包括机侧变流器和网侧变流器，机侧变流器和网侧变流器之间通过直流母线电连接，直流母线还连接有储能装置。可基于直流母线电压给定值和直流母线电压反馈值得到功率控制量。在功率控制量超出储能装置的储能功率能力范围的情况下，优先为储能装置分配储能装置能够承载的功率控制量，按照储能功率能力范围的功率能力边界值，为储能装置从功率控制量中拆分得到第一功率控制量，并基于第一功率控制量对储能装置进行控制，优先使储能装置为电网提供惯量支撑。功率控制量拆分得到的第二功率控制量用于进行机侧变流器的控制，以使风力发电机组的转子动能为电网提供另一部分惯量支撑。储能装置与转子动能共同提供惯量支撑，尽量减少风力发电机组的转子动能为电网提供的惯量支撑，减少甚至避免风力发电机组出现疲劳载荷超限的情况，从而提高风力发电机组的稳定性。
储能装置与转子动能可共同提供惯量支撑，储能装置可吸收能量以存储也可释放存储的能量的特性，能够保证直流母线电压稳定，避免直流母线过压或欠压导致的故障，也能够保证风力发电机组的功率正常稳定，保证并网正常。而且，由于储能装置与转子动能可共同提供惯量支撑，也可适当降低对储能装置的如储能倍率等的性能的要求，从而降低风力发电系 统的成本。
在一些实施例中，储能控制模块303可用于：根据第一功率控制量和采集的储能装置功率反馈值，得到第三功率控制量；根据第三功率控制量，利用功率闭环策略对储能装置进行控制，和/或，将第三功率控制量转换为第一非功率控制量，根据第一非功率控制量，利用第一非功率类控制策略对储能装置进行控制，第一非功率控制量包括非功率的控制量，第一非功率类控制策略的输入为非功率的控制量。
在一些实施例中，机侧控制模块304可用于：根据更新后的机侧功率给定值和采集的机侧功率反馈值，得到第四功率控制量；根据第四功率控制量，利用功率闭环策略对机侧变流器进行控制，和/或，将第四功率控制量转换为第二非功率控制量，根据第二非功率控制量，利用第二非功率类控制策略对机侧变流器进行控制，第二非功率控制量包括非功率的控制量，第二非功率类控制策略的输入为非功率的控制量。
图8为本申请另一实施例提供的风力发电机组变流控制装置的结构示意图，图8与图7的不同之处在于，图8所示的风力发电机组变流控制装置300还可包括网侧控制模块305。
网侧控制模块305可用于：基于机侧变流器更新前的机侧功率给定值，得到网侧变流器的网侧功率给定值；基于网侧功率给定值和采集的网侧功率反馈值，对网侧变流器进行控制。
在一些示例中，网侧控制模块305可用于：将机侧变流器更新前的机侧功率给定值确定为网侧变流器的网侧功率给定值；或者，获取机侧变流器的机侧功率反馈值和网侧变流器的网侧功率反馈值，计算得到机侧功率反馈值与网侧功率反馈值的第一功率差，基于机侧变流器更新前的机侧功率给定值与第一功率差的差值确定为变流器的网侧功率给定值。
图9为本申请另一实施例提供的风力发电机组变流控制装置的结构示意图，图9与图8的不同之处在于，图8所示的风力发电机组变流控制装置300还可包括荷电状态控制模块306。
荷电状态控制模块306可用于：基于预设的荷电状态SOC给定范围和采集的储能装置的SOC反馈值，得到SOC功率控制量；将网侧功率给定 值与SOC功率控制量的功率加和确定为更新后的网侧功率给定值。
在一些示例中，荷电状态控制模块306可用于：计算得到预设的第一SOC给定值与SOC反馈值的第一SOC差值，根据第一SOC差值，得到SOC功率控制量，第一SOC给定值位于SOC给定范围内。
在一些示例中，荷电状态控制模块306可用于：判断SOC反馈值是否位于SOC给定范围内，在SOC反馈值位于SOC给定范围外的情况下，计算得到预设的第二SOC给定值与SOC反馈值的第二SOC差值，根据第二SOC差值，得到SOC功率控制量，第二SOC给定值位于SOC给定范围内。
在一些实施例中，上述储能控制模块303还可用于：在功率控制量位于储能装置的储能功率能力范围内的情况下，基于功率控制量对储能装置进行控制。
本申请第三方面还提供了一种风力发电机组变流控制设备，风力发电机组变流控制设备可实现为风力发电机组变流控制器或其他可控制风力发电机组的变流过程的设备，在此并不限定。图10为本申请一实施例提供的风力发电机组变流控制设备的结构示意图。如图10所示，风力发电机组变流控制设备400包括存储器401、处理器402及存储在存储器401上并可在处理器402上运行的计算机程序。
在一些示例中，上述处理器402可以包括中央处理器(CPU)，或者特定集成电路(Application Specific Integrated Circuit，ASIC)，或者可以被配置成实施本申请实施例的一个或多个集成电路。
存储器401可包括只读存储器(Read-Only Memory，ROM)，随机存取存储器(Random Access Memory，RAM)，磁盘存储介质设备，光存储介质设备，闪存设备，电气、光学或其他物理/有形的存储器存储设备。因此，通常，存储器包括一个或多个编码有包括计算机可执行指令的软件的有形(非暂态)计算机可读存储介质(例如，存储器设备)，并且当该软件被执行(例如，由一个或多个处理器)时，其可操作来执行参考根据本申请实施例中风力发电机组变流控制方法所描述的操作。
处理器402通过读取存储器401中存储的可执行程序代码来运行与可执行程序代码对应的计算机程序，以用于实现上述实施例中的风力发电机组变流控制方法。
在一些示例中，风力发电机组变流控制设备400还可包括通信接口403和总线404。其中，如图10所示，存储器401、处理器402、通信接口403通过总线404连接并完成相互间的通信。
通信接口403，主要用于实现本申请实施例中各模块、装置、单元和/或设备之间的通信。也可通过通信接口403接入输入设备和/或输出设备。
总线404包括硬件、软件或两者，将风力发电机组变流控制设备400的部件彼此耦接在一起。举例来说而非限制，总线404可包括加速图形端口(Accelerated Graphics Port，AGP)或其他图形总线、增强工业标准架构(Enhanced Industry Standard Architecture，EISA)总线、前端总线(Front Side Bus，FSB)、超传输(Hyper Transport，HT)互连、工业标准架构(Industry Standard Architecture，ISA)总线、无限带宽互连、低引脚数(Low pin count，LPC)总线、存储器总线、微信道架构(Micro Channel Architecture，MCA)总线、外围组件互连(Peripheral Component Interconnect，PCI)总线、PCI-Express(PCI-E)总线、串行高级技术附件(Serial Advanced Technology Attachment，SATA)总线、视频电子标准协会局部(Video Electronics Standards Association Local Bus，VLB)总线或其他合适的总线或者两个或更多个以上这些的组合。在合适的情况下，总线404可包括一个或多个总线。尽管本申请实施例描述和示出了特定的总线，但本申请考虑任何合适的总线或互连。
本申请第四方面提供一种风力发电系统，该风力发电系统可包括上述实施例中的风力发电机组、储能装置和风力发电机组变流控制设备。风力发电机组与储能装置的架构可参见图1，在此不再赘述。风力发电机组变流控制设备可执行上述实施例中的风力发电机组变流控制方法，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还可提供一种计算机可读存储介质，该计算机可读存储介质上存储有计算机程序指令，该计算机程序指令被处理器执行时可实现 上述实施例中的风力发电机组变流控制方法，且能达到相同的技术效果，为避免重复，这里不再赘述。其中，上述计算机可读存储介质可包括非暂态计算机可读存储介质，如只读存储器(Read-Only Memory，简称ROM)、随机存取存储器(Random Access Memory，简称RAM)、磁碟或者光盘等，在此并不限定。
本申请实施例还可提供一种计算机程序产品，该计算机程序产品中的指令可由电子设备的处理器执行时，使得电子设备执行上述实施例中的风力发电机组变流控制方法，且能达到相同的技术效果，为避免重复，这里不再赘述。
需要明确的是，本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同或相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。对于装置实施例、设备实施例、系统实施例、计算机可读存储介质实施例、计算机程序产品实施例而言，相关之处可以参见方法实施例的说明部分。本申请并不局限于上文所描述并在图中示出的特定步骤和结构。本领域的技术人员可以在领会本申请的精神之后，作出各种改变、修改和添加，或者改变步骤之间的顺序。并且，为了简明起见，这里省略对已知方法技术的详细描述。
上面参考根据本申请的实施例的方法、装置(系统)和计算机程序产品的流程图和/或框图描述了本申请的各方面。应当理解，流程图和/或框图中的每个方框以及流程图和/或框图中各方框的组合可以由计算机程序指令实现。这些计算机程序指令可被提供给通用计算机、专用计算机、或其它可编程数据处理装置的处理器，以产生一种机器，使得经由计算机或其它可编程数据处理装置的处理器执行的这些指令使能对流程图和/或框图的一个或多个方框中指定的功能/动作的实现。这种处理器可以是但不限于是通用处理器、专用处理器、特殊应用处理器或者现场可编程逻辑电路。还可理解，框图和/或流程图中的每个方框以及框图和/或流程图中的方框的组合，也可以由执行指定的功能或动作的专用硬件来实现，或可由专用硬件和计算机指令的组合来实现。
本领域技术人员应能理解，上述实施例均是示例性而非限制性的。在 不同实施例中出现的不同技术特征可以进行组合，以取得有益效果。本领域技术人员在研究附图、说明书及权利要求书的基础上，应能理解并实现所揭示的实施例的其他变化的实施例。在权利要求书中，术语“包括”并不排除其他装置或步骤；数量词“一个”不排除多个；术语“第一”、“第二”用于标示名称而非用于表示任何特定的顺序。权利要求中的任何附图标记均不应被理解为对保护范围的限制。权利要求中出现的多个部分的功能可以由一个单独的硬件或软件模块来实现。某些技术特征出现在不同的从属权利要求中并不意味着不能将这些技术特征进行组合以取得有益效果。

Claims (11)

  1. 一种风力发电机组变流控制方法，应用于风力发电机组，所述风力发电机组包括机侧变流器和网侧变流器，所述网侧变流器通过直流母线与所述机侧变流器电连接，所述直流母线还电连接有储能装置，所述方法包括：
    基于直流母线电压给定值和采集的直流母线电压反馈值，得到功率控制量；
    在功率控制量超出所述储能装置的储能功率能力范围的情况下，基于所述储能功率能力范围的功率能力边界值，根据所述功率控制量确定第一功率控制量和所述第二功率控制量，所述第一功率控制量与所述功率能力边界值对应；
    基于所述第一功率控制量对所述储能装置进行控制；
    将所述第二功率控制量与所述机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于所述更新后的机侧功率给定值对所述机侧变流器进行控制。
  2. 根据权利要求1所述的方法，其中，所述基于所述第一功率控制量对所述储能装置进行控制，包括：
    根据所述第一功率控制量和采集的储能装置功率反馈值，得到第三功率控制量；
    根据所述第三功率控制量，利用功率闭环策略对所述储能装置进行控制，和/或，将所述第三功率控制量转换为第一非功率控制量，根据所述第一非功率控制量，利用第一非功率类控制策略对所述储能装置进行控制，所述第一非功率控制量包括非功率的控制量，所述第一非功率类控制策略的输入为非功率的控制量。
  3. 根据权利要求1所述的方法，其中，所述基于所述更新后的机侧功率给定值对所述机侧变流器进行控制，包括：
    根据所述更新后的机侧功率给定值和采集的机侧功率反馈值，得到第四功率控制量；
    根据所述第四功率控制量，利用功率闭环策略对所述机侧变流器进行控制，和/或，将所述第四功率控制量转换为第二非功率控制量，根据所述第二非功率控制量，利用第二非功率类控制策略对所述机侧变流器进行控制，所述第二非功率控制量包括非功率的控制量，所述第二非功率类控制策略的输入为非功率的控制量。
  4. 根据权利要求1所述的方法，还包括：
    基于所述机侧变流器更新前的机侧功率给定值，得到所述网侧变流器的网侧功率给定值；
    基于所述网侧功率给定值和采集的网侧功率反馈值，对所述网侧变流器进行控制。
  5. 根据权利要求4所述的方法，其中，所述基于所述机侧变流器更新前的机侧功率给定值，得到所述网侧变流器的网侧功率给定值，包括：
    将所述机侧变流器更新前的机侧功率给定值确定为所述网侧变流器的网侧功率给定值；
    或者，
    获取所述机侧变流器的机侧功率反馈值和所述网侧变流器的网侧功率反馈值，
    计算得到所述机侧功率反馈值与所述网侧功率反馈值的第一功率差，
    基于所述机侧变流器更新前的机侧功率给定值与所述第一功率差的差值确定为所述变流器的网侧功率给定值。
  6. 根据权利要求4所述的方法，在所述基于所述网侧功率给定值和采集的网侧功率反馈值，对所述网侧变流器进行控制之前，还包括：
    基于预设的荷电状态SOC给定范围和采集的所述储能装置的SOC反馈值，得到SOC功率控制量；
    将所述网侧功率给定值与所述SOC功率控制量的功率加和确定为更新后的所述网侧功率给定值。
  7. 根据权利要求6所述的方法，其中，所述基于预设的荷电状态SOC给定范围和采集的所述储能装置的SOC反馈值，得到SOC功率控制量，包括：
    计算得到预设的第一SOC给定值与所述SOC反馈值的第一SOC差值，所述第一SOC给定值位于所述SOC给定范围内，
    根据所述第一SOC差值，得到所述SOC功率控制量；
    或者，
    判断所述SOC反馈值是否位于所述SOC给定范围内，
    在所述SOC反馈值位于所述SOC给定范围外的情况下，计算得到预设的第二SOC给定值与所述SOC反馈值的第二SOC差值，所述第二SOC给定值位于所述SOC给定范围内，
    根据所述第二SOC差值，得到所述SOC功率控制量。
  8. 根据权利要求1所述的方法，还包括：
    在所述功率控制量位于所述储能装置的储能功率能力范围内的情况下，基于所述功率控制量对所述储能装置进行控制。
  9. 一种风力发电机组变流控制装置，应用于风力发电机组，所述风力发电机组包括机侧变流器和网侧变流器，所述网侧变流器通过直流母线与所述机侧变流器电连接，所述直流母线还电连接有储能装置，所述装置包括：
    功率控制量计算模块，用于基于直流母线电压给定值和采集的直流母线电压反馈值，得到功率控制量；
    功率控制量分配模块，用于在功率控制量超出所述储能装置的储能功率能力范围的情况下，基于所述储能功率能力范围的功率能力边界值，根据所述功率控制量确定第一功率控制量和所述第二功率控制量，所述第一功率控制量与所述功率能力边界值对应；
    储能控制模块，用于基于所述第一功率控制量对所述储能装置进行控制；
    机侧控制模块，用于将所述第二功率控制量与所述机侧变流器的机侧功率给定值的第一加和确定为更新后的机侧功率给定值，并基于所述更新后的机侧功率给定值对所述机侧变流器进行控制。
  10. 一种风力发电机组变流控制设备，包括：处理器以及存储有计算机程序指令的存储器；
    所述处理器执行所述计算机程序指令时实现如权利要求1至8中任意一项所述的风力发电机组变流控制方法。
  11. 一种风力发电系统，包括：
    风力发电机组，包括机侧变流器和网侧变流器，所述网侧变流器通过直流母线与所述机侧变流器电连接；
    储能装置，与所述直流母线电连接；
    如权利要求10所述的风力发电机组变流控制设备。
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