Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
  • B60L15/02—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles characterised by the form of the current used in the control circuit
  • B60L15/025—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles characterised by the form of the current used in the control circuit using field orientation; Vector control; Direct Torque Control [DTC]
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
  • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
• • 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
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M1/00—Details of apparatus for conversion
  • H02M1/12—Arrangements for reducing harmonics from AC input or output
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
  • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
  • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
  • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
  • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
  • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
  • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
  • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
  • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
  • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
  • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
  • H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
  • H02M7/53875—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
  • H02M7/53876—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
• • 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
  • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
  • H02P29/50—Reduction of harmonics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L2270/00—Problem solutions or means not otherwise provided for
  • B60L2270/10—Emission reduction
  • B60L2270/14—Emission reduction of noise
  • B60L2270/147—Emission reduction of noise electro magnetic [EMI]
• • 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
  • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
  • H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
• • 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
  • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
  • Y02E40/40—Arrangements for reducing harmonics
• • 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
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/64—Electric machine technologies in electromobility
• • 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
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
• • 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
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• • 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
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02T90/10—Technologies relating to charging of electric vehicles
  • Y02T90/14—Plug-in electric vehicles

Definitions

• the invention relates to a method and a device for reducing current harmonics at harmonic frequencies of a fundamental frequency, which are caused by an AC / DC converter switchable to a polyphase system.
• switchable AC / DC converters which convert a multi-phase analog current signal into a DC voltage which, for example, to La ⁇ can be a battery, in particular a vehicle battery, ver ⁇ spent.
• These AC / DC converters or converters are sometimes referred to as inverters.
• the AC / DC converters conventionally comprise semiconductor switching elements, in particular IGBTs and MOSFET switches, which with a
• pulse width modulated control signal can be controlled. Due to nonlinearities of the switching elements within the AC / DC converter, the conversion of the analog or voltage signal into a DC voltage produces current harmonics at harmonic frequencies of the fundamental frequency. The magnitude of the current harmonics can be expressed as the total distortion factor THD (Total Harmony Distortion).
• THD Total Harmony Distortion
• the invention accordingly provides a method for reducing current harmonics at harmonic frequencies of a fundamental frequency, which in particular depends on one of a plurality of harmonics.
• phase-shiftable AC / DC converter with the steps:
• the phase currents are converted into a two-dimensional current vector I dq by means of a d / q transformation on the basis of the harmonic multiple of the detected voltage angle .
• this two-dimensional current vector I dq is filtered by a low-pass filter for damping the remaining harmonic frequencies.
• the filtered by the low pass filter ⁇ two dimensional current vector I dq is supplied to a current regulator which regulates the filtered two-dimensional current vector to produce a modulation depth M dq.
• the degree of modulation M dq is determined by means of an inverse sen d / q transformation transformed based on the harmonic multiple of the detected voltage angle in the space vector of the respective harmonic frequency.
• the sum space vector is subjected to an inverse Clarke transformation.
• the invention further provides a device having the features specified in claim 4.
• the invention thus provides an apparatus for reducing current harmonics at harmonic frequencies of a fundamental frequency caused by a multiphase switchable AC / DC converter, comprising:
• (A) a detection unit for detecting a voltage ⁇ angle ( ⁇ ) and of phase currents (I a , I b , I c ) of the multi-phase system;
• a PWM generator for generating PWM control signals in dependence on the calculated sum space vector (SRZ), the generated PWM control signals driving the AC / DC converter of the polyphase system.
• the second calculation unit comprises: a multiplier for multiplying the detected voltage angle ( ⁇ ) with a harmonic multipliers ⁇ tion factor of the respective harmonic frequency (fi); a d / q transformation unit for transforming the phase currents (I a , I b , I c ) of the polyphase system based on the detected harmonic multiple (h- ⁇ ) of the detected voltage angle ( ⁇ ) in a two-dimensional
• LPF low pass filter
• SR A current regulator (SR), which controls the filtered two-dimensional current vector (I d q) for generating a Modulati ⁇ onsgrades (M dq ) and
• the low-pass filter of a second calculation unit provided for a specific harmonic frequency has a transmission characteristic which has zeros at the remaining harmonic frequencies.
• the low-pass filter is an FIR (Finite Impulse Response) filter.
• the invention further provides a multi-phase system having a device for reducing current oscillations at harmonic frequencies of a fundamental frequency, which one of the Multiphase system switchable AC / DC converter can be evoked
• the device for reducing current harmonics comprising:
• (C) a plurality of second calculation units (HC l ), each having a further space vector (RZi) for a harmonic frequency (fi) of the detected phase currents (I a , I b , I c ) based on harmonic multiples of the detected voltage angle (h- ⁇ ) to calculate;
• a PWM generator for generating PWM control signals in dependence on the calculated sum space vector (SRZ), the generated PWM control signals driving the AC / DC converter of the polyphase system.
• the AC / DC converter converts the phase currents of the multiphase system into a DC voltage for a load.
• this load is a vehicle battery of a vehicle.
• the AC / DC converter can be switched over between the polyphase system and an induction machine, in particular a rotating field motor.
• the invention further provides an electric vehicle having means for reducing current harmonics at harmonic frequencies of a fundamental frequency, the electric vehicle including means for reducing current harmonics at the harmonic frequencies of the fundamental frequency, the apparatus comprising:
• HC 1 a plurality of second calculation units (HC 1 ), each having a further space vector (RZi) for a harmonic frequency (fi) of the detected phase currents (I a , I b , I c ) based on harmonic multiples of the detected voltage angle (h- calculate ⁇ );
• a PWM generator for generating PWM control signals in dependence on the calculated sum space vector (SRZ), wherein the generated PWM control signals drive the AC / DC converter of the polyphase system
• the AC / DC converter is switchable between the polyphase system and an electric motor and wherein the electric vehicle further comprises a vehicle battery connected as a load to the AC / DC converter.
• Fig. 1 is a block diagram of an amongsa multi-phase system, in which the inventive method for reducing current harmonics can be used;
• FIG. 2 is a block diagram for a gameantssbei ⁇ a multiphase system in an electric vehicle in which the invention shown SSE method for reducing current harmonics is used.
• FIG. 3 is a block diagram of a control device having an inventive device for Re ⁇ duzierung of current harmonics according to the invention.
• FIG. 4 A block diagram of an embodiment of a calculation unit, the approximate variation in he ⁇ inventive device in an execution may be used Fig. 4;
• FIG. 5 shows a block diagram for an embodiment of a current regulator which can be used in the device according to the invention
• FIGS. 9a, 9b are signal diagrams for explaining the reduction of current harmonics caused by the method according to the invention and the device according to the invention;
• FIG. 10a, 10b to represent the signal spectra caused by the inventive method and by which he ⁇ device according to the invention re duzierung of current harmonics;
• FIG. 11 shows a circuit diagram for illustrating an embodiment of an AC / DC converter, in which the method according to the invention and the device according to the invention for reducing
• an AC / DC converter 2 can be provided, which via coils or chokes 3-1, 3-2, 3-3 phase currents I a , I b , I c of three phases LI, L2, L3 of the multiphase system 1 receives.
• the AC / DC converter 2 may be constructed as shown in FIG. 11, for example.
• the AC / DC converter 2 converts the phase currents of the polyphase system 1 into a DC voltage DC for a load 4.
• Parallel to the resistive load 4, a capacitor 5 with a certain capacitance C can be connected.
• the AC / DC converter 2 internally includes switching elements, such as IGBT switches or MOSFETs, which are driven by PWM control signals. These PWM control signals are generated by a control device 6, which can be connected to sensors 7 and / or actuators 8.
• a control device 6 which can be connected to sensors 7 and / or actuators 8.
• the AC / DC converter 2 for each of the three phases LI, L2, L3 or for each of the three phase currents I a , I b , I c via two switching elements, such as IGBT or MOSFET switch.
• the control electrodes of the switching elements within the AC / DC converter 2 receive from the control scarf ⁇ device 6, the PWM control signals.
• the control circuit 6 supplies six PWM control signals CRTL PWM for the six control electrodes of the AC / DC converter 2 illustrated in FIG.
• FIG. 2 shows a block diagram for an application example in which an AC / DC converter 2 between an external multi-phase system 1 and a rotating field machine 9 by means of
• Switches 10-1, 10-2, 10-3 is switchable.
• the AC / DC converter 2 is located within an electric vehicle 11, which can be connected via an interface 12 to a three-phase system with three phases LI, L2, L3.
• the induction machine 9 is a
• the AC / DC converter 2 can be switched by means of the switches 10-i between the polyphase system 1 and the electric motor 9.
• the AC / DC converter 2 is connected to a vehicle battery of the electric vehicle 11, which has the capacitor 5 and the resistor 4.
• the AC / DC converter 2 converts the phase currents I a , I b , I c of the polyphase system 1 into a DC voltage V dc of the vehicle battery.
• the device 13 for reducing current harmonics at harmonic frequencies of a fundamental frequency f 0 which are caused by an AC / DC converter 2 which can be switched to the polyphase system 1, contains a plurality of units in one possible embodiment.
• the device 13 includes a Detection unit ME for detecting a voltage angle and phase currents of the multi-phase system. 1
• FIG. 8 shows a signal diagram for a three-phase system in which a plurality of phase voltages V a , V b , V c are shown over time.
• a measuring unit or a detection unit can be represented by means of sensors S, as shown in Fig. 3, detect the ⁇ se phase voltages V a, V b, V c. From the phase voltages V a , V b , V c, the detection unit ME determines a voltage angle ⁇ , which is applied to a d / q transformation unit in one possible embodiment, as shown in FIG.
• the apparatus 13 comprises a first calculation unit for calculation of a basic Be ⁇ space vector RZ 0 for a fundamental frequency fo of the phase currents I a covered, I b, I c on the basis of the detected voltage angle ⁇ .
• the phase currents I a, I b, I c can in egg ⁇ ner possible variant embodiment, as shown in Fig. 3, using sensory be detected by sensors S.
• the d / q transformation unit is used to convert the three-phase current variables into a biaxial coordinate system.
• phase currents of the multiphase system 1 are transferred dq in a two-dimensional current vector I.
• This two-dimensional current vector I dq is applied to an AC current regulator AC-SR as shown in FIG.
• the device 13 further includes a DC current regulator DC-SR-A which compares an adjustable DC IDC SOLL with a sensed DC current I dc .
• the DC current controller DC-SR-A for example, compares the one at
• Vehicle battery of the AC / DC converter 2 output charging current I dc with a desired charging current.
• the DC current regulator may be, for example, a PID or PI current regulator.
• the first current regulator DC-SR-A supplies a DC target voltage, which is compared by a second DC voltage regulator DC-SR-B with a measured DC voltage V dc .
• the DC voltage V dc applied to a vehicle battery is sensed by means of a sensor and compared with the supplied by the current regulator DC-SR-A target DC voltage V DCSOLL .
• the DC voltage regulator DC-SR-B may, for example, be a PID regulator.
• the DC voltage regulator DC-SR-B can deliver a desired current IQ SOLL 3.fr the AC current regulator AC-SR, as shown in Fig. 3. In addition, it receives the sensed DC DC voltage, which is sensed by a vehicle battery, for example. Furthermore, the AC current regulator AC-SR receives an adjustable current ID SOLL / as shown in FIG.
• the measuring unit ME also supplies one of the
• AC current controller AC-SR evaluable voltage amplitude V amp On the output side, a d / q reverse transformation unit d / q -1 is provided to the AC current regulator AC-SR, which supplies a basic space vector RZ 0 for the fundamental frequency f 0 of the measured phase currents on the basis of the detected voltage angle ⁇ .
• Fig. 5 shows an embodiment for a Beticiansein ⁇ integrated for calculating a basic space vector RZ 0 for a fundamental frequency f 0 of the detected phase currents from the detected voltage angle. In that shown in Fig. 5
• Embodiment includes these two PI controller, which compare ei ⁇ NEN instantaneous current value with a target value, wherein the first PID controller and the second PIQ controller are each fed back via an integrating member locally. On the output side, the two PI controllers add or
• the two Dekoppellute for the two signal paths, in one embodiment, the two Dekoppelept as will be ⁇ expects this: function [CC_D_DECOUPLE, CC_Q_DECOUPLE, CC_D_DECOUPLE_RCOMPONEN,
• CC_Q_DECOUPLE_RCOMPONENT] feedforward (ID_SP, IQ_SP, RS, LD, LQ, VAMP)
• CC_D_DECOUPLE_RCOMPONENT RS * ID_SP;
• CC_Q_DECOUPLE_RCOMPONENT RS * IQ_SP;
• CC_D_DECOUPLE RS * ID_SP - WE * LQ * IQ_SP;
• CC_Q_DECOUPLE RS * IQ_SP + WE * (LD * ID_SP) + VAMP;
• the two PI controllers illustrated in FIG. 5 can be replaced by a PID controller or by a coupled control device, for example MIMO.
• the inventive device for reducing current harmonics at harmonic frequencies of a fundamental frequency f 0 has, in addition to the first calculation unit shown in FIG. 5 for calculating a basic spatial vector RZ 0 for the fundamental frequency f 0, a plurality of second calculation units each having a further space vector RZi for a harmonic frequency of the detected phase currents I a , I b , I c be ⁇ calculate.
• the device 13 a plurality of second computation units HCi HC ... n to the various ⁇ which harmonic frequencies.
• the further space vectors RZi for the harmonic frequencies are respectively calculated on the basis of harmonic multiples of the detected voltage angle h- ⁇ , as shown in FIG.
• the voltage angle ⁇ detected by the Erfas ⁇ sungsaku is multiplied by multipliers ⁇ tion facilities or multiplier with a multiplication factor harmonic hi corresponding to the order of each harmonic frequency fi.
• the additional space vectors RZi supplied by the different second calculation units HC 1 are added up by an adder.
• the adder adds the calculated space vector RZ 0 of the fundamental frequency f 0 and the space vector RZi the harmonic frequencies f ⁇ to calculate a sum space pointer SRZ, as shown in Fig. 3.
• a PWM generator generates the PWM GEN PWM control signals in dependence of the calculated sums from ⁇ space vector SRZ.
• Kgs ⁇ NEN the generated PWM control signals such as the in 1 or 2 shown AC / DC converter 2 are supplied.
• Fig. 4 shows a block diagram for one embodiment of a second calculation unit HC l, such as may be used in the OF INVENTION ⁇ to the invention apparatus 13 for reducing current harmonics.
• the detected voltage angle ⁇ with egg ⁇ nem multiplier is first reacted with a harmonic Multi sidessfak- tor hi multiplied.
• the sensory detected phase currents I a , ⁇ b , I c are fed to a d / q transformation unit, which transforms the phase currents of the polyphase system based on the he ⁇ detected harmonic multiples (h- ⁇ ) of the detected voltage angle ⁇ in a two-dimensional current vector I dq .
• a low-pass filter TPF filters the generated two-dimensional current vector I dq for attenuation of the remaining harmonic frequency components.
• a current regulator SR controls the filtered two-dimensional current vector I dq to produce a degree of modulation M dq , as shown in FIG. 4.
• An inverse d / q transformation unit transforms the er Weg ⁇ th modulation degree M dq means of an inverse d / q transformation based on the harmonic multiples (h- ⁇ ) of the detected voltage angle ⁇ in the space vector RZI the respective harmonic frequency f-j_.
• low pass filter LPF can for example be formed by an FIR (Finite Impulse Response) filter.
• the low-pass filter TPF has a transfer characteristic H (f) which forms zeros at the remaining harmonic frequencies.
• the low-pass filter is a moving-average filter, ie a moving-average filter in which, in particular, all coefficients can be the same.
• the low-pass filter characteristic ⁇ at the fundamental frequency f 0 and at the multiples of the fundamental frequency respectively zeros on. If the fundamental frequency f 0 changes, the
• the even harmonic f (2K) is absent or has low amplitude values. In such application scenarios, it is not necessary to filter these even harmonics through the low pass filter TPF and only the second harmonic is filtered out by the low pass filter.
• the number of samples is:
• N round ((f s ): (2 - f 0 ))
• te it is possible to implement such a moving average low-pass filter through multiple filters to reduce the number of samples, each time a
• Fig. 7 shows a flow diagram illustrating an embodiment of the method for Reduzie ⁇ tion of current harmonics at harmonic frequencies of a fundamental frequency f0.
• a voltage angle ⁇ and the phase currents I a , I b , I c of the polyphase system 1 are detected.
• a basic space vector RZ 0 for the fundamental frequency f 0 of the measured phase currents I a , I b , I c is calculated on the basis of the detected voltage angle ⁇ .
• step S3 further space vectors RZi for harmonic frequencies fi of the measured phase currents are calculated on the basis of harmonic multiples of the detected solid angle h- ⁇ .
• step S4 the calculated space vectors of the fundamental frequency f 0 and the harmonic multiples or harmonic frequencies are added up to form a sum space vector SRZ.
• step S5 the PWM control signals are generated as a function of the calculated sum space vector SRZ.
• step S6 an AC / DC converter of the polyphase system 1 with the generated PWM control signals is activated.
• the phase currents I a , I b , I c are first determined by means of a d / q transformation on the basis of the harmonic multiple of the detected voltage angle (h - ⁇ ) into a two-dimensional current vector I dq , which is filtered by a low-pass filter TPF to attenuate the remaining harmonic sequences and fed to a current regulator.
• This current controller regulates the filtered two-dimensional current vector I dq to produce a degree of modulation M dq .
• the modulation depth M generated dq is transformed back by means of ei ⁇ ner inverse d / q transformation based on the harmonic multiples of the detected voltage angle ⁇ in the space vector RZ i of the respective harmonic frequency f ⁇ .
• step S4 the calculated space vectors of the fundamental frequency and the harmonic frequencies are added up to calculate the sum space vector SRZ.
• the sum space pointer SRZ can preferably be subjected to an inverse Clarke transformation.
• Figures 9a, 9b show the course of a sinusoidal current signal with and without use of the method according to the invention for the reduction of current harmonics.
• Fig. 9a shows the conventional course of the sinusoidal current signal, such as that supplied by a conventional AC / DC converter.
• 9b shows the signal profile when the method according to the invention is used, in which, for example, an AC / DC converter is controlled by a control device which contains the device according to the invention for reducing current harmonics at harmonic frequencies of a fundamental frequency.
• the distortions in the current signal are significantly reduced by the method according to the invention.
• Figures 10a, 10b show signal spectra of current signals with and without use of the method according to the invention for the reduction of current harmonics.
• the amplitude of the respective current signal is shown in dB above the signal frequency f.
• Fig. 10a shows the spectrum without the use of the inventive method for reducing current harmonics
• Fig. 10b represents the spectrum of a current signal using the method according to the invention for the reduction of current harmonics at harmonic frequencies at a fundamental frequency of for example 50 Hz.
• the inventive method and on ⁇ direction for reducing current harmonics may, in particular for driving an AC / DC converter 2him- be set, as shown for example in Fig. 11 according to the invention.
• Such an AC / DC converter 2 can be located, for example, in an electric vehicle 11, which has a
• Electric motor 9 has, as shown in Fig. 2.
• the ⁇ same AC / DC converter 2 both for an electric motor of the electric vehicle and for charging a vehicle battery to use.
• An AC / DC converter can be designed for high currents of, for example, 300 A rms .
• the driving ⁇ generating battery is conventionally charged with lower currents, for example 16, 32 or 64 A rms. Therefore, current harmonics at the harmonic frequencies of the

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• 2012
  • 2012-03-28 DE DE102012204963A patent/DE102012204963A1/de not_active Withdrawn
• 2013
  • 2013-02-14 WO PCT/EP2013/052927 patent/WO2013143762A2/fr not_active Ceased

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