CN117200648B - Control device for harmonics in AC motor power supply driven by multiple inverters - Google Patents
Control device for harmonics in AC motor power supply driven by multiple inverters Download PDFInfo
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Abstract
The application provides a control device of ac motor power supply harmonic wave of multiple inverter drive, this control device includes: a main driver, a signal processor and at least one active filter; the signal processor comprises a signal acquisition unit, a filtering unit, a control unit and a modulation unit, wherein the signal acquisition unit is used for acquiring a current signal; the filtering unit is used for filtering interference signals in the current signals and acquiring waveforms of the current signals or generating feedback signals according to the current signals; the control unit performs data processing on waveforms of current signals before and after the input filter unit to obtain fundamental current frequency and phase of the current signals, and determines a given value required by a target harmonic according to the adjustment requirement of the target harmonic; the modulation unit is used for outputting a voltage switching signal to the active filter. Through the arrangement, the target harmonic wave customization is realized, the harmonic wave content in the current signal is reduced, or the current harmonic wave of a certain order is directionally enhanced, the high-performance control of the motor is met, and meanwhile, the cost is lower.
Description
Technical Field
The invention relates to the field of power electronic conversion, in particular to a control device for power supply harmonic waves of an alternating current motor driven by multiple inverters.
Background
With the continuous advancement of industrial electrification, more motors with higher power, higher frequency and the like meeting the requirements of high-performance control are increasingly required. Under such conditions, conventional inverter power capability and conventional single inverter drive approaches are increasingly plagued.
In motors requiring high performance current control, there is a high hardware requirement on the inverter, as in the case of a high current content, high current frequency or lower carrier ratio resulting from high performance control.
Taking a high-speed motor as an example, because of the high-frequency current characteristic of the high-speed motor, a device capable of being switched on and off at high frequency is needed to control the high-speed motor, and under the condition of traditional single-inverter driving control, the high-speed motor brings very large voltage modulation pressure to an inverter. In high-power traction transmission systems such as compressors and turbine systems, the highest switching frequency of an inverter is generally limited by factors such as heat dissipation conditions, besides the switching frequency of power electronics, and cannot be increased along with the motor speed. Under the condition, as the motor rotation speed is continuously increased, the motor angular frequency is gradually caused to be close to the switching frequency of the power device of the inverter, and the carrier wave is relatively low when the control voltage waveform output by the inverter is modulated, so that a large amount of low-order harmonics are contained in the motor armature winding current.
In the related art, the main stream improvement direction is basically improvement based on a single inverter, and comprises the step of adding a passive filter device on a motor three-phase bus, or adopting a multi-level technology to design the inverter, or replacing the inverter with a device with higher turn-off speed and better heat dissipation performance.
However, the filtering effect is not obvious enough in the above solution, and harmonic current in the system can be suppressed only to a certain extent. Or more power electronic devices are needed, the reliability requirement is high, the cost is high, and the operation and maintenance are difficult. There is no harmonic customization scheme available at present, which can have low cost and better filtering effect.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a control device for power supply harmonic waves of an alternating current motor driven by multiple inverters, which has lower hardware cost and better filtering effect.
The application provides a control device of ac motor power supply harmonic wave of many inverters drive, its characterized in that, control device includes:
the main driver is used for providing power current for driving the motor to work, is connected with the alternating current bus in a parallel connection mode and is electrically connected with the motor through the alternating current bus;
at least one active filter connected in parallel with the ac busbar, the active filter and the main driver together forming an armature current for driving the motor; the active filter is used for outputting harmonic custom-made current so as to adjust the harmonic content in the armature current of the motor and improve the armature current of the motor to the expected waveform;
a signal processor, comprising:
the signal acquisition unit is used for acquiring a current signal, and the current signal at least comprises the power current of the main driver, the harmonic custom-made current of the active filter and the armature current of the driving motor;
the filtering unit is used for filtering interference signals in the current signals and acquiring waveforms of the current signals, or generating feedback signals for controlling the active filter according to the current signals;
the control unit is used for carrying out data processing on waveforms of current signals before and after the input filtering unit so as to obtain fundamental current frequency and phase of the current signals, and determining a given value required by a target harmonic according to the adjustment requirement of the target harmonic; the control unit outputs a given value to the active filter, and controls the active filter to execute corresponding current control according to the given value and the feedback signal;
and the modulating unit is used for modulating the pulse width of the voltage switching signal output to the active filter according to the output result of the current control.
Further, the active filter includes at least one current controller, and the active filter controls a corresponding number of harmonic customized currents through the current controller, and the current controller is used for compensating invalid or harmful current harmonics output by the main driver or injecting valid current harmonics which cannot be output by the main driver.
Further, the current controller is a proportional resonance type controller, the current controller can be optimized into a second-order band-pass filter, the passband of the second-order band-pass filter is determined according to the frequency of the target harmonic, and the open-loop transfer function of the current controller meets the following relation:
；
wherein,representing the resonance coefficient of the current controller for the k-th harmonic,/for the current controller>Scale factor representing current controller for k harmonics,/->The angular frequency of the fundamental current is represented.
Further, under the condition that pole-zero elimination is satisfied, the closed loop transfer function of the current controller can be optimized into a second-order band-pass filter, according to the transfer function of the second-order band-pass filter, the frequency of the target harmonic is ensured to fall within the passband of the second-order band-pass filter, and the transfer function of the second-order band-pass filter satisfies the following relation:
；
wherein,is the k-th harmonic current of the active filter output,/->Is given to the k harmonic current of the current controller, and L is the inductance value of the three-phase inductor in the active filter controlled by the current controller.
Further, in the case that the active filter compensates the corresponding harmonic wave through different current controllers, the different current controllers are overlapped with each other, and pass bands of the current controllers after the zero poles of the current controllers are eliminated are not in a state of being overlapped with each other, and the current controllers are overlapped with each other to satisfy the following relation:
；
wherein,represented as the frequency of the harmonics.
Further, the bus voltage on the dc side of the active filter is equal to or greater than the bus voltage on the dc side of the main driver and equal to or less than 2 times the bus voltage on the dc side of the main driver.
Further, the hardware connection topologies of different active filters are identical.
Further, the main driver comprises a three-phase full-control bridge inverter, the direct current side of the three-phase full-control bridge inverter is connected with a direct current power supply, and the alternating current side of the three-phase full-control bridge inverter is connected to an alternating current bus in parallel through a three-phase bus inductor; the direct current side of the three-phase full-control bridge inverter is provided with a high-capacity direct current filter capacitor.
Further, the control unit determines the waveform of the fundamental current of the current signal according to the difference value of the waveforms of the current signals before and after the input filtering unit, determines the frequency and the phase of the fundamental current according to the waveform of the fundamental current, and determines a given waveform according to the requirement of a target harmonic;
the control unit is specifically configured to obtain a first deviation value by making a difference between a given waveform and a harmonic current in a power current of the main driver, and is also configured to obtain a second deviation value by making a difference between the given waveform and the harmonic current in an armature current of the motor, and determine a given value according to a sum of the first deviation value and the second deviation value.
Further, the modulation unit modulates the output result of the current control by the SVPWM method to form a voltage PWM switching signal, and transmits the PWM switching signal to the active filter.
The main driver of the control device is connected with at least one active filter in parallel, the power current output by the main driver and the harmonic wave customizing current output by the active filter jointly form an armature current for driving the motor, the active filter is adjusted to output target harmonic wave according to a given value determined by the signal processor, thereby realizing target harmonic wave customizing, reducing the harmonic wave content in a current signal, or directionally enhancing the current harmonic wave of a certain order, and the control device has better filtering effect and lower cost.
Drawings
Fig. 1 is a schematic diagram of hardware connection of a control device for power supply harmonics of a multi-inverter driven ac motor in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a signal processor in an embodiment of the present application.
Fig. 3 is a flowchart of the operation of the control device for the power supply harmonics of the ac motor driven by multiple inverters according to the embodiment of the present application.
Fig. 4 is a schematic design diagram of a plurality of current controllers of an active filter according to an embodiment of the present application.
Fig. 5 is a diagram showing experimental simulation results of a control device for power supply harmonics of an ac motor driven by multiple inverters in an embodiment of the present application.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the technical solutions in the specific embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
The present application provides a control device 100 for multi-inverter driven ac motor supply harmonics as shown in fig. 1, the control device 100 comprising a main driver 11 and at least one active filter 12. The main drive 11 is connected in parallel with an ac bus 13, and the main drive 11 is connected to a motor 14 via the ac bus 13. The main driver 11 is specifically configured to supply a driving current for driving the motor 14.
The motor 14 is suitable for the following application scenarios, for example:
a motor 14 having a higher armature current so that the switching frequency of semiconductor devices (e.g., MOS switches) controlling the motor 14 is low, so that the motor 14 is easily in a low carrier ratio modulation environment when driven.
A motor 14 having a higher current frequency such that the current frequency is close to the switching frequency of the semiconductor device, such that the motor 14 is easily in a low carrier ratio modulation environment when driven.
The motor 14 satisfying high performance control requires a modulation environment with a higher carrier ratio to achieve accurate control of the motor 14, thereby avoiding the situation of insufficient carrier ratio in the modulation environment.
Illustratively, the main drive 11 comprises a three-phase fully controlled bridge inverter (hereinafter inverter), the dc side of the inverter of the main drive 11 being connected to a dc power source, the ac side of the inverter of the main drive 11 being connected in parallel to an ac bus 13 by a three-phase bus inductance (hereinafter inductance). Referring to fig. 1, the inductance of the main driver 11 is denoted as L0, and the resistance is R0.
Optionally, a large-capacity direct current filter capacitor can be additionally arranged on the direct current side of the inverter of the main driver 11 according to actual requirements.
Further, the active filter 12 is connected in parallel with the ac busbar 13, and the active filter 12 and the main driver 11 together form an armature current for driving the motor 14. The active filter 12 is specifically configured to output a harmonic customized current of a target order to adjust the harmonic content of the armature current to thereby improve the armature current to a desired waveform.
Since the active filter 12 is only responsible for improving the harmonic content in the armature current of the motor 14, the frequency of the current output from the active filter 12 is high, and the power of the active filter 12 is low relative to the main driver 11. Specifically, the structure of the active filter 12 is substantially identical to that of the main driver 11, and the active filter 12 includes an inverter and an inductor of the same structure as those in the main driver 11. Referring to fig. 1, the inductance of the active filter 12 is denoted as Ln, and the resistance is Rn (n=1, 2,3, …).
Because the hardware design of the active filter 12 is related to the algorithm parameter design, when there are a plurality of target order harmonics to be regulated, a plurality of active filters 12 with different sub-tubes and different frequencies can be connected in parallel on the ac bus 13, and the plurality of active filters 12 are identical in hardware connection topology.
For example, referring to fig. 1, the control device 100 includes an active filter 1, an active filter 2, … …, and an active filter n. The active filter 1 customizes the invalid or harmful current harmonics output by the main driver 11 according to the given value required by the target order harmonics, and the active filter 2 injects the valid current harmonics which cannot be output by the main driver 11 according to the given value required by the target order harmonics. Thereby achieving the effect of customizing the current, thereby adjusting the harmonic content in the armature current, and thereby improving the armature current to the desired waveform. The above arrangement has low hardware requirements for power electronics and is convenient to maintain.
In order to solve the problem of the direct current side voltage in the main driver 11 and the active filter 12, the voltage of the direct current bus of the main driver 11 is selected according to the voltage class of the motor 14 design, and the active filter 12 requires the voltage of the direct current bus of the active filter 12 to be equal to or higher than the voltage of the direct current bus of the main driver 11 and equal to or lower than 2 times the voltage of the direct current bus of the main driver 11 in order to ensure that the current can be injected into the armature of the motor 14 at any time.
As shown in fig. 1, further, the control device 100 further includes a signal processor 15, the signal processor 15 is connected to the ac bus 13 through the motor 14, and the signal processor 15 is connected to the main driver 11 and the active filter 12 in parallel, respectively. The signal processor 15 is capable of determining a given value required for the target harmonic from the armature current of the motor 14, the power current of the main driver 11, and outputting the given value to the active filter 12 so that the active filter generates a harmonic-customized current for adjusting the target harmonic from the given value.
By the arrangement, the harmonic current in the armature current can be effectively customized, and/or the effective current harmonic which cannot be output by the main driver 11 is injected, and under the condition that the switching frequency of the semiconductor device of the main driver 11 is low, the harmonic content in the armature current can be obviously reduced by connecting the active filter 12, and meanwhile, the control device 100 is low in cost and high in reliability.
As shown in fig. 2, as one implementation, the signal processor 15 includes a signal acquisition unit 151, a filtering unit 152, a control unit 153, and a modulation unit 154.
Specifically, the signal acquisition unit 151 is configured to acquire a current signal, where the current signal includes at least a power current output by the main driver 11, a harmonic custom current output by the active filter 12, and an armature current of the driving motor 14. The signal acquisition unit 151 acquires the power current of the main driver 11And armature current->Conversion into synchronous coordinate system, thereby obtaining the power current +.>And the converted armature current +.>And converts the power current of the main driver 11And armature current->To the filtering unit 152.
Further, the filtering unit 152 is configured to filter the interference signal in the current signal, and obtain a waveform of the current signal;
optionally, the filtering unit 152 generates a feedback signal for controlling the active filter 12 according to the current signal, wherein the filtering unit 152 is a second order filter.
In this embodiment, the control unit 153 is configured to perform data processing on waveforms of the current signals before and after the input filtering unit 152, obtain the fundamental current frequency and phase of the current signals, and determine a given value required for the target harmonic according to the adjustment requirement of the target harmonic.
Illustratively, the control unit 153 determines the waveform of the fundamental current of the current signal from the difference in waveforms of the current signals before and after the input filtering unit 152, the control unit 153 determines the frequency and phase of the fundamental current from the waveform of the fundamental current, and determines a given waveform from the requirement of the target harmonic.
Further, the control unit 153 converts the given waveform and the converted power current of the main driver 11The harmonic currents in (a) are differenced to obtain a first deviation value +.>The control unit 153 also compares the given waveform with the converted armature current>The harmonic currents in (a) are differenced to obtain a second deviation value +.>For the first deviation value->And a second deviation value->Summing the desired set value +.>。
More specifically, the control unit 153 acquires the output current of the active filter 12 through the signal acquisition unit 151, and outputs the output current and a given value to the active filter 12 according to a preset tuning frequencyData processing is carried out, and the data processing result is limited to enable the data processing result to haveThe source filter 12 outputs a corresponding harmonic custom current.
The control unit 153 obtains the output current of the active filter 12And outputs the current +.>The harmonic custom current under the synchronous coordinate system is obtained by converting the coordinate transformation into the synchronous coordinate system>Thereby obtaining a given value->Harmonic custom current in synchronous coordinate system>Is a deviation value of (a). The deviation value is data-processed according to a preset tuning frequency by integrating a current controller provided on the active filter 12, and the data processing result is input to the modulation unit 154 after being limited. Wherein the tuning frequency is a target harmonic frequency, which can be obtained by detecting the electrical frequency of the motor 14 or the rotational frequency of the motor 14 and multiplying the same by a corresponding multiple.
Further, the modulation unit 154 modulates the output result of the current control by the SVPWM method to form a voltage PWM switching signal, and supplies the PWM switching signal to the active filter. Thereby achieving harmonic custom current output.
In the related art, the direct cause of the poor operation of the motor 14 is due to the hardware limitation of the main driver 11 and the excessively high harmonic content in the armature current of the motor 14, and the root cause is that the power electronics of the main driver 11 cannot accommodate the large torque (large armature current), high frequency (high electrical frequency) of the motor 14.
The simulation experiment result shown in fig. 5 is provided, after the armature current harmonic wave of the motor 14 is reduced, the torque pulsation of the motor 14 is reduced, the heating is reduced, the noise is reduced, and the motor 14 is more beneficial to long-time efficient operation.
The experiment simulates a high-load operation scene of the motor 14, and adopts a three-phase six-state BLDC driving mode, and at the moment, the switching frequency of a power electronic device in one electric period is the lowest, and the carrier ratio is the lowest. Under the worst condition that the carrier ratio of the main inverter is 1, the active filter 12 is utilized to compensate for 5 and 7 harmonics only, so that the target harmonic compensation rate can be more than 75%, the 5 harmonics are reduced from 20.3% to 4.43%, and the 7 harmonics are reduced from 15.8% to 4.39%.
As an implementation, the active filter 12 comprises at least one current controller, by which the active filter 12 controls a corresponding amount of harmonic current, the current controller being used to compensate for invalid or harmful current harmonics output by the main driver 11 or to inject valid current harmonics that the main driver 11 cannot output.
Illustratively, when at least two active filters 12 are both capable of achieving control over the same harmonic pair, at least two active filters 12 are required due to excessive harmonic current content that needs to be adjusted or other special circumstances that may arise, and any of the active filters 12 includes a current controller for that harmonic pair, thereby enabling both active filters 12 to achieve control over the same harmonic pair.
Specifically, the order of the target harmonic and the number of active filters 12 to be used are determined, a current controller is allocated to each active filter 12, and the chopping frequency employed by the inverter of the active filter 12 is confirmed.
And after the hardware is built, completing the parameter design of the current controller. On the premise that the current controller can be optimized into a second-order band-pass filter, confirming that the passband of the current controller is good according to the frequency of the target harmonic, wherein the open-loop transfer function of the current controller meets the following relation:
；
wherein, the requirements are satisfiedWherein R and L are respectively represented as a resistance value and an inductance value of the active filter 12, < ->Resonance coefficient and proportionality coefficient of current controller for k-th harmonic respectively, +.>The angular frequency of the fundamental current is represented.
After meeting the condition of pole-zero cancellation, the current controller closed loop transfer function may be optimized as a second order bandpass filter, ensuring that the frequency of the target harmonic falls within the passband of the second order bandpass filter according to the transfer function of the second order bandpass filter, the transfer function of the second order bandpass filter satisfying the following relationship:
；
wherein,is the k-th harmonic current output by the active filter 12,>is given to the k harmonic current of the current controller, and L is the inductance value of the three-phase inductor in the active filter controlled by the current controller.
As shown in fig. 4, after the harmonic current controllers for k harmonics are designed according to the above formula, if the same active filter 12 needs to perform current customization for different harmonics, each current controller is overlapped according to the following formula, and meanwhile, it is only necessary to ensure that pass bands after pole-zero elimination of each current controller are not overlapped with each other:
；
wherein,represented as the frequency of the harmonics.
By way of example, by means of the above-described solution, a harmonic customization of the armature current can be achieved, including an increase (injection) or a decrease (compensation) of the content of the target harmonic current in the armature current. Whereas if it is desired to switch the active filter 12 in the two different operating states described above, only the set point required to adjust the target harmonic needs to be adjusted, and no adjustments need to be made in hardware.
It can be seen that the control effect of the active filter 12 on the target harmonic is only determined by the given value, and the injection and compensation can be implemented using the same active filter 12, even the same current controller, only by reasonably setting the given value of the target harmonic, so as to facilitate the maintenance and adjustment of the control device 100 by the operator.
As shown in fig. 3, for example, when it is desired to compensate the harmonic current to eliminate the harmonic in the armature current, the set portion is given as 0, and then the actual harmonic content of the harmonic detection portion is given by 0 to be differenced, which in practice corresponds to injection of an equal-magnitude reverse compensation current. The armature current harmonic wave is usually 6n + -1 harmonic waves such as 5, 7, 11, 13, … … and the like when three phases are connected in Y-type, namely + -6 n order harmonic waves under a synchronous coordinate system, and the proportional resonance controller can control positive and negative order harmonic wave pairs simultaneously, so that the transfer function of a control part is tuned in a compensation working stateI.e. the transfer function is as follows:
；
when it is desired to inject the harmonic current to directionally increase a specific order harmonic in the armature current, it is necessary to confirm the phase and amplitude of the target harmonic in the synchronous coordinate system, and the phase and amplitude of the harmonic in the synchronous coordinate system with the same frequency but the reverse order, and the waveform is generated as a given after synthesis in the synchronous coordinate system, and the control unit 153 tunes the frequency of the target order harmonic pair, so that the rest processes are not different and are not repeated here.
Through the arrangement, the harmonic current in the armature current of the motor 14 can be effectively customized, and after the harmonic wave of the armature current is reduced, the torque pulsation of the motor 14 is reduced, the heating is reduced, the noise is reduced, and the motor 14 is more beneficial to long-time efficient operation. Meanwhile, the cost of the power electronic device in the arrangement is lower, and the maintenance is more convenient.
Illustratively, assume the fundamental frequency isThe frequency of the target harmonic converted into synchronous coordinate system is +.>The current controller operates in a synchronous coordinate system and can be aimed at a frequency of +.>Is controlled simultaneously. The transfer function is as follows:
；
is satisfied thatUnder the constraint of (2), the principle of pole-zero elimination can be satisfied, and the obtained open loop transfer function is optimized as follows:
；
thereby degrading the closed loop transfer function of the system to a second order bandpass filter. Wherein R and L are the resistance and inductance of the three-phase inductor of the active filter respectively.
When the constraint requirements are met and the optimization design is carried out, the frequency of the target harmonic wave under the synchronous coordinate system needs to be enabled to fall at the center frequency of the band-pass filter as much as possible, so that the control responsiveness of the target harmonic wave of the controller is good, and meanwhile, the frequency range where other harmonic wave pairs are located in the pass band of the second-order band-pass filter needs to be avoided.
In addition, considering the bandpass characteristics of the optimized current controllers, if multiple target harmonics need to be adjusted and the frequencies are close, it is also possible to attempt to integrate multiple current controllers in one active filter 12, in order to satisfyOn the premise of optimizing conditions and under the condition that design pass bands of all harmonic current controllers are mutually independent, the current controllers aiming at different harmonic pairs are mutually overlapped, and control is carried out at the same time. Referring to fig. 4, a current controller structure for simultaneously customizing current harmonics of multiple pairs and injecting harmonics of a certain frequency in an active filter is shown. Assume a total required frequency of +.>Is controlled by the harmonics of the current controller as a whole after superposition:
；
furthermore, a second order filter is required for extracting the harmonic content, and the transfer function of the second order filter satisfies the following relation:
；
wherein the method comprises the steps ofIs the natural frequency of the second order filter and ζ is the damping coefficient. If the above second order filter is used to find that the damping effect is poor, it is possible to consider increasing the damping coefficient or to use a second order filter in addition to the output side of the filtering unit 152. Since the current controller has good frequency characteristics, the harmonic detector requirements as shown in fig. 4 are not strict.
By the technical scheme, harmonic customization of the armature current can be realized, and the content of the target harmonic current in the armature current is increased (injected) or decreased (compensated). Whereas if it is desired to switch the active filter 12 between the two different operating states, only the given set-up part of the flow shown in fig. 3 need be adjusted, and no adjustments need be made in hardware. Furthermore, it should be noted that the control effect of the active filter 12 on the target harmonic is only determined by a given value, and the injection and compensation can be implemented using the same active filter 12, even the same current controller, only by reasonably setting the given value of the target harmonic.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (10)
1. A control device for power supply harmonics of an ac motor driven by multiple inverters, the control device comprising:
the main driver is used for providing power current for driving the motor to work, is connected with an alternating current bus in a parallel mode and is electrically connected with the motor through the alternating current bus;
at least one active filter connected in parallel with the ac bus, the active filter and the main driver together forming an armature current for driving the motor; the active filter is used for outputting harmonic custom-made current so as to adjust harmonic content in armature current of the motor and improve the armature current of the motor to a desired waveform;
a signal processor, comprising:
the signal acquisition unit is used for acquiring a current signal, and the current signal at least comprises the power current of the main driver, the harmonic custom-made current of the active filter and the armature current for driving the motor;
the filtering unit is used for filtering interference signals in the current signals and acquiring waveforms of the current signals or generating feedback signals for controlling the active filter according to the current signals;
the control unit is used for carrying out data processing on waveforms of the current signals before and after being input into the filtering unit so as to obtain fundamental current frequency and phase of the current signals, and determining a given value required by the target harmonic according to the adjustment requirement of the target harmonic; the control unit outputs the given value to the active filter, and controls the active filter to execute corresponding current control according to the given value and the feedback signal;
and the modulating unit is used for modulating the pulse width of the voltage switching signal output to the active filter according to the output result of the current control.
2. A control arrangement according to claim 1, wherein the active filter comprises at least one current controller by which the active filter controls harmonic tailored currents of respective orders, the current controller being arranged to compensate for non-effective or unwanted current harmonics output by the main driver or to inject effective current harmonics that cannot be output by the main driver.
3. The control device according to claim 2, characterized in that the current controller is a proportional resonance type controller, the current controller being capable of being optimized as a second order bandpass filter and determining the passband of the second order bandpass filter from the frequency of the target harmonic, the open loop transfer function of the current controller satisfying the following relation:
；
wherein,representing the resonance coefficient of the current controller for the k-th harmonic, < >>Representing the scaling factor of the current controller for the k-th harmonic, +.>The angular frequency of the fundamental current is represented.
4. A control arrangement according to claim 3, characterized in that the closed loop transfer function of the current controller can be optimized as a second order bandpass filter, in case pole-zero cancellation is fulfilled, according to which the frequency of the target harmonic is guaranteed to fall within the passband of the second order bandpass filter, the transfer function of which fulfils the following relation:
；
wherein,is the k-th harmonic current of the output of the active filter,>is the given value of the k-th harmonic current to the current controller, and L is the inductance value of the three-phase inductance in the active filter controlled by the current controller.
5. The control device according to claim 4, wherein, in the case where the active filters compensate for the corresponding harmonics by different current controllers, the different current controllers are superimposed on each other, and pass bands of the respective current controllers after pole-zero cancellation are not in a state of being superimposed on each other, the current controllers are superimposed on each other so as to satisfy the following relation:
；
wherein,represented as the frequency of the harmonics.
6. The control device according to claim 1, wherein a bus voltage on a direct current side of the active filter is equal to or greater than a bus voltage on a direct current side of the main driver and equal to or less than 2 times the bus voltage on the direct current side of the main driver.
7. The control device of claim 1, wherein hardware connection topologies of different active filters are identical.
8. The control device according to claim 1, wherein the main drive comprises a three-phase full-bridge inverter, a direct current side of which is connected to a direct current power supply, an alternating current side of which is connected in parallel to the alternating current bus by a three-phase bus inductance; the direct current side of the three-phase full-control bridge inverter is provided with a high-capacity direct current filter capacitor.
9. The control device according to claim 1, wherein the control unit determines a waveform of a fundamental current of the current signal from a difference of waveforms of the current signals before and after being input to the filter unit, the control unit determines a frequency and a phase of the fundamental current from the waveform of the fundamental current, and determines a given waveform from a requirement of the target harmonic;
the control unit is specifically configured to obtain a first deviation value by making a difference between the given waveform and a harmonic current in a power current of the main driver, and is further configured to obtain a second deviation value by making a difference between the given waveform and a harmonic current in an armature current of the motor, and determine the given value according to a sum of the first deviation value and the second deviation value.
10. The control apparatus according to claim 1, wherein the modulation unit modulates the output result of the current control by an SVPWM method to form a voltage PWM switching signal, and supplies the PWM switching signal to the active filter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311468829.XA CN117200648B (en) | 2023-11-07 | 2023-11-07 | Control device for harmonics in AC motor power supply driven by multiple inverters |
| JP2024042864A JP7546330B1 (en) | 2023-11-07 | 2024-03-18 | Harmonic control device for power supply of multi-inverter-driven AC motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311468829.XA CN117200648B (en) | 2023-11-07 | 2023-11-07 | Control device for harmonics in AC motor power supply driven by multiple inverters |
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| CN117200648A (en) | 2023-12-08 |
| JP2025077946A (en) | 2025-05-19 |
| JP7546330B1 (en) | 2024-09-06 |
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