CN113629712A - Common mode rejection and characteristic improvement method of active power filter - Google Patents

Common mode rejection and characteristic improvement method of active power filter Download PDF

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Publication number
CN113629712A
CN113629712A CN202110902983.8A CN202110902983A CN113629712A CN 113629712 A CN113629712 A CN 113629712A CN 202110902983 A CN202110902983 A CN 202110902983A CN 113629712 A CN113629712 A CN 113629712A
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active power
power filter
phase
common
zero
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Inventor
吴宗兵
孔令峰
方荣
刘洋洋
董冉昊
周亚
吴成勇
戴研
吴岚
岳诚
黄衍源
杨兵
李志鹏
李志伟
胡文明
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State Grid Corp of China SGCC
Chuzhou Power Supply Co of State Grid Anhui Electric Power Co Ltd
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State Grid Corp of China SGCC
Chuzhou Power Supply Co of State Grid Anhui Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—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
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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
    • Y02E40/20—Active power filtering [APF]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a common-mode rejection and characteristic improvement method of an active power filter, which injects a zero-sequence component into a final modulating wave generation link of the active power filter by adopting a zero-sequence injection mode, thereby greatly reducing the common-mode interference of the active power filter, inhibiting the power frequency 3-time fluctuation of a bus and greatly improving the performance of the active power filter. The invention can effectively inhibit the common-mode interference of the T-shaped three-level active power filter, enables the low-frequency fluctuation of the direct-current bus to be 0, greatly improves the performance of the active power filter, reduces the difficulty of engineering design and enhances the reliability and stability of a control system of the active power filter.

Description

Common mode rejection and characteristic improvement method of active power filter
Technical Field
The invention relates to the technical field of power electronic control, in particular to a common-mode rejection and characteristic improvement method of an active power filter.
Background
With the development of the third generation semiconductor technology, a new solution is provided for solving the problem of power quality by using a high-voltage and high-current SiC MOSFET device, wherein a T-type three-level topology becomes the mainstream topology of a parallel active power filter with the advantages of high reliability, high efficiency and the like of the topology under the introduction of a Si MOSFET, however, the parallel active power filter is a special power electronic conversion device with high dynamic, high tracking accuracy and compensation rate requirements, and therefore, in the process of harmonic dynamic compensation, the problem of common mode interference is more obvious, and the stress of the MOSFET and the stable operation of the active power filter are seriously affected. Therefore, a modulation algorithm for the application scenario is needed to improve the common-mode interference characteristic of the T-type three-level topology active power filter by adjusting the working mode and state on the basis of not affecting the performance of the key index.
In a power conversion scene of a rectifier, a part of modulation algorithms for inhibiting the common-mode interference of the topology are kicked out, for example, an SVM (space vector modulation algorithm) is used in a scene requiring power frequency sinusoidal tracking to improve the common-mode characteristic, and due to the complexity of the characteristic of the three-level topology SVM, a method of overlapping a double-carrier SPWM and a zero-sequence component to simplify the algorithm is also proposed, and the two algorithms are equivalent in nature. Meanwhile, in order to further inhibit the common-mode interference characteristic, some algorithms for dynamically adjusting the vector distribution size by changing the injection mode of the zero-sequence component on the basis of the dual-carrier SPWM are proposed, but the optimization is difficult to achieve in the aspects of bus fluctuation, common-mode distribution, THD influence and the like.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a common mode rejection and characteristic improvement method for an active power filter, which enables theoretical common mode characteristics to be maximally rejected and a bus to have no low frequency fluctuation through an improved zero sequence component injection algorithm; the common mode characteristic is suppressed, the system performance is greatly improved, and other abnormity cannot be caused.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for suppressing common mode and improving characteristics of an active power filter injects a zero sequence component into a final modulating wave generation link of the active power filter by adopting a zero sequence injection mode, so that the common mode interference of the active power filter is greatly reduced, the power frequency 3-time fluctuation of a bus is suppressed, and the performance of the active power filter is greatly improved.
Further, the active power filter is a T-type three-level active power filter.
Further, when the active power filter is a T-type three-level active power filter, in the process of controlling the T-type three-level active power filter, firstly, phase locking is performed according to a power grid to obtain a phase of a power grid voltage, then, load current is collected, and Clarke conversion and Park conversion are performed, wherein the implementation manner of the conversion is as follows:
Figure BDA0003200654040000031
wherein the content of the first and second substances,
Figure BDA0003200654040000032
Figure BDA0003200654040000033
wherein the content of the first and second substances,
Figure BDA0003200654040000034
the method comprises the following steps that the product of conversion of load current and U is used as the given of reactive power, the product of conversion of output three-phase current of an active power filter and U is collected to be used as the feedback of closed-loop control, and a direct-current bus voltage loop is used as an outer loop to maintain the voltage stability of a bus of the active power filter; the power inner loop adopts a PI controller structure, and three-phase modulation waves are obtained through DQ-ABC inverse transformation after passing through the power inner loop; and (3) superposing a zero sequence component on the basis of the double-carrier SPWM by the three-phase modulation wave, and finally superposing the output of the inner-loop regulator and the constructed zero sequence component and then sending the superposed component into a double-carrier PWM (pulse width modulation) modulation device to generate a modulation signal.
Further, the calculation process of the zero sequence component is as follows:
Figure BDA0003200654040000035
Figure BDA0003200654040000036
wherein DTri0Representing zero sequence components to be injected, DutyA, DutyB and DutyC are three-phase modulation wave duty ratio of T-shaped three-level active power filter respectively, DtriA、DtriB、DtriCRespectively representing the current loop regulator outputs of the active power filters; i isA、IB、ICThree-phase output currents of the active power filter are respectively; iA|、|IB|、|ICAnd | respectively calculating absolute values of three-phase currents.
Has the advantages that: the invention can effectively inhibit the common-mode interference of the T-shaped three-level active power filter, enables the low-frequency fluctuation of the direct-current bus to be 0, greatly improves the performance of the active power filter, reduces the difficulty of engineering design and enhances the reliability and stability of a control system of the active power filter.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a topology diagram of a T-type three-level active power filter in a common-mode rejection and characteristic improvement method of the active power filter according to an embodiment of the invention;
fig. 2 is a schematic view of a configuration flow of a zero-sequence component of a common-mode rejection and characteristic improvement method of an active power filter according to an embodiment of the present invention;
FIG. 3 is a block diagram of a direct power control dual-carrier SPWM zero-sequence injection control system of a parallel active power filter based on T-type three-level;
fig. 4 is a waveform diagram of a classical conventional zero sequence component.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that, in the following description,the conventional zero-sequence component injection method is that three-phase modulation waves are set to be D respectivelyTriA、DTriB、DTriCA classical zero-sequence component injection method is as follows:
Dmax＝max(DTriA，DTriB，DTriC)
Dmin＝min(DTriA，DTriB，DTriC)
Figure BDA0003200654040000051
DutyA＝DTriA-DTri0
DutyB＝DTriB-DTri0
DutyC＝DTriC-DTri0
wherein, the max () and min () functions are used to calculate the maximum and minimum values of the instantaneous value of the duty ratio of the three-phase modulation wave. Fig. 4 is a waveform diagram of a classical conventional zero-sequence component, and thus it can be seen that the conventional zero-sequence component injection method cannot maximally suppress the common-mode characteristic.
Fig. 1 is a topological diagram of a T-type three-level active power filter, in which the classical SPWM, SVM (space vector) and other modulation algorithms all generate a certain regular common mode interference between ON points, the SVM is superior to SPWM, and N-fold fluctuations of power frequency (different depending ON the component of the harmonic current to be compensated) are generated between N and + Bus and N and-Bus.
Fig. 2 is a schematic diagram of a construction process of a zero-sequence component, and fig. 3 is a block diagram of a direct power control dual-carrier SPWM zero-sequence injection control system of a parallel active power filter based on T-type three-level.
In the embodiment, the zero sequence component is injected in the final modulating wave generation link of the active power filter by adopting a zero sequence injection mode, so that the common mode interference of the active power filter is greatly reduced, the power frequency 3-time fluctuation of a bus is restrained, and the performance of the active power filter is greatly improved.
Specifically, in the process of controlling the parallel active power filter, the embodiment first performs phase locking according to a power grid to obtain a phase of a power grid voltage, and then collects a load current and performs Clarke (Clarke) conversion and Park conversion, where an implementation manner of the conversion is as follows:
Figure BDA0003200654040000061
wherein the content of the first and second substances,
Figure BDA0003200654040000062
Figure BDA0003200654040000063
wherein the content of the first and second substances,
Figure BDA0003200654040000064
the product of the conversion of the load current and the U is used as the given reactive power (generally, the harmonic current power is considered to be reactive), the product of the conversion of the output three-phase current of the active power filter and the U is collected to be used as the feedback of closed-loop control, and the voltage loop of the direct-current bus is used as an outer loop to maintain the voltage stability of the bus of the active power filter (namely, to maintain the power consumption of the operation of the active power filter). Wherein the power inner loop adopts a PI controller structure. And after the three-phase modulation wave passes through the power inner loop, the three-phase modulation wave is obtained through DQ-ABC inverse transformation. The three-phase modulation wave superposes a zero sequence component on the basis of the double-carrier SPWM, wherein the construction method of the zero sequence component is as follows:
Figure BDA0003200654040000065
Figure BDA0003200654040000066
wherein DTri0Representing zero sequence components to be injected, DutyA, DutyB and DutyC are three-phase modulation wave duty ratio of T-shaped three-level active power filter respectively, DtriA、DtriB、DtriCRespectively representing the current loop regulator outputs of the active power filters; i isA、IB、ICThree-phase output currents of the active power filter are respectively; iA|、|IB|、|ICAnd | respectively calculating absolute values of three-phase currents.
And finally, overlapping the output of the inner ring regulator and the constructed zero sequence component, and sending the overlapped output to a double-carrier PWM (pulse-Width modulation) device to generate a modulation signal.
The mode suppression and characteristic improvement method of the active power filter in the embodiment enables the common mode characteristic of the T-type three-level topology to be suppressed in the control system, and the performance of the parallel active power filter is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (4)

1. A common-mode rejection and characteristic improvement method of an active power filter is characterized in that a zero-sequence component is injected in a final modulating wave generation link of the active power filter by adopting a zero-sequence injection mode, so that the common-mode interference of the active power filter is greatly reduced, the power frequency 3-time fluctuation of a bus is restrained, and the performance of the active power filter is greatly improved.
2. The method according to claim 1, wherein the active power filter is a T-type three-level active power filter.
3. The common-mode rejection and characteristic improvement method of the active power filter according to claim 2, wherein when the active power filter is a T-type three-level active power filter, in a process of controlling the T-type three-level active power filter, firstly, a phase of a grid voltage is obtained according to a grid in a phase-locked manner, then, a load current is collected, and Clarke transformation and Park transformation are performed, wherein an implementation manner of the transformation is as follows:
Figure FDA0003200654030000011
wherein the content of the first and second substances,
Figure FDA0003200654030000012
Figure FDA0003200654030000013
wherein the content of the first and second substances,
Figure FDA0003200654030000014
the method comprises the following steps that the product of conversion of load current and U is used as the given of reactive power, the product of conversion of output three-phase current of an active power filter and U is collected to be used as the feedback of closed-loop control, and a direct-current bus voltage loop is used as an outer loop to maintain the voltage stability of a bus of the active power filter; the power inner loop adopts a PI controller structure, and three-phase modulation waves are obtained through DQ-ABC inverse transformation after passing through the power inner loop; and (3) superposing a zero sequence component on the basis of the double-carrier SPWM by the three-phase modulation wave, and finally superposing the output of the inner-loop regulator and the constructed zero sequence component and then sending the superposed component into a double-carrier PWM (pulse width modulation) modulation device to generate a modulation signal.
4. The method according to claim 3, wherein the zero sequence component is calculated by:
Figure FDA0003200654030000021
Figure FDA0003200654030000022
wherein DTri0Representing zero sequence components to be injected, DutyA, DutyB and DutyC are three-phase modulation wave duty ratio of T-shaped three-level active power filter respectively, DtriA、DtriB、DtriCRespectively representing the current loop regulator outputs of the active power filters; i isA、IB、ICThree-phase output currents of the active power filter are respectively; iA|、|IB|、|ICAnd | respectively calculating absolute values of three-phase currents.
CN202110902983.8A 2021-08-06 2021-08-06 Common mode rejection and characteristic improvement method of active power filter Pending CN113629712A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116545237A (en) * 2023-07-05 2023-08-04 深圳市首航新能源股份有限公司 Resonance suppression method, electronic equipment and computer storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116545237A (en) * 2023-07-05 2023-08-04 深圳市首航新能源股份有限公司 Resonance suppression method, electronic equipment and computer storage medium
CN116545237B (en) * 2023-07-05 2024-04-09 深圳市首航新能源股份有限公司 Resonance suppression method, electronic equipment and computer storage medium

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