CN110635491A - Active power filtering system and control method thereof and related equipment - Google Patents

Active power filtering system and control method thereof and related equipment Download PDF

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CN110635491A
CN110635491A CN201910916982.1A CN201910916982A CN110635491A CN 110635491 A CN110635491 A CN 110635491A CN 201910916982 A CN201910916982 A CN 201910916982A CN 110635491 A CN110635491 A CN 110635491A
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current
power supply
circuit
control circuit
load
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邓珊
彭龙
张永旺
党三磊
招景明
欧振国
黄博伟
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Guangdong Power Grid Co Ltd
Metrology Center of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Metrology Center of Guangdong Power Grid 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The embodiment of the application discloses an active power filter system, a control method thereof and related equipment, wherein the active power filter system comprises a power supply current control circuit and a load current control circuit; the power supply current control circuit comprises a power supply side and a power supply impedance; the load current control circuit comprises a HPF, an APF and a load side; the APF comprises an instruction current operation circuit, a current tracking control circuit, a driving circuit and a main circuit which are sequentially connected in series from a load side to a power supply side; the power supply side is electrically connected with the instruction current arithmetic circuit. The system has the advantages that the power supply current control circuit and the load current control circuit share the instruction current operation circuit, the current tracking control circuit, the driving circuit and the main circuit, so that the APF can track the change of the load harmonic current quickly, the influence of the power grid frequency and the power supply harmonic voltage fluctuation is inhibited, the problem of abnormal work of electrical equipment caused by the harmonic voltage fluctuation is solved, the working performance of the hybrid active filter is effectively improved, and the reliability is high.

Description

Active power filtering system and control method thereof and related equipment
Technical Field
The present application relates to the field of active power filtering technologies, and in particular, to an active power filtering system, a control method thereof, and a related device.
Background
With the continuous development of economy, various power electronic devices/loads are continuously put into a power system, so that a large number of harmonics are generated, and the power supply quality of the power system is influenced; on the other hand, more and more precision instruments and digital equipment put higher demands on the power supply quality of the power grid. Therefore, the method has important significance for accurate detection and effective treatment of harmonic waves.
In an ideal situation, the power supply should always provide a perfect sinusoidal voltage for each customer. However, for several reasons, it is difficult for the power supply enterprise to maintain this ideal condition, and the actual voltage and current waveforms always deviate from the standard sine wave. In recent years, with rapid development of economy, various power electronic loads are increasing, and harmonic pollution in a power grid is also becoming more serious.
Therefore, suppressing harmonics and improving power factor have become an important issue in the field of power electronics and power system research.
Disclosure of Invention
The embodiment of the application provides an active power filter system, a control method thereof and related equipment, and solves the problem that electrical equipment does not work normally due to harmonic voltage fluctuation.
In view of the above, a first aspect of the present application provides an active power filter system, including a power supply current control circuit and a load current control circuit;
the power supply current control circuit comprises a power supply side and a power supply impedance;
the load current control circuit comprises a HPF, an APF and a load side;
the APF comprises an instruction current operation circuit, a current tracking control circuit, a driving circuit and a main circuit which are sequentially connected in series from a load side to a power supply side;
the power supply side is electrically connected to the command current arithmetic circuit.
A second aspect of the present application provides a control method for an active power filter system, which is applied to the power filter device of the first aspect, and takes the sum of a load-side current and a current generated by an APF as a current source;
the method comprises the following steps:
formulating a single-phase equivalent circuit reflecting the HPF and the power supply impedance;
calculating a transfer function between the current at the power supply side and the current source according to the single-phase equivalent circuit;
and selecting a power supply current control circuit or a load current control circuit for current compensation according to the transfer function.
Preferably, the single-phase equivalent circuit comprises a power supply side, a power supply resistor, a power supply inductor and the HPF which are connected in sequence to form a closed loop; the HPF is connected in parallel with the current source.
Preferably, the HPF includes a filter resistance, a filter inductance, and a filter capacitance;
and the filter resistor is connected with the filter inductor in parallel and then connected with the filter capacitor in series.
Preferably, the calculating a transfer function between the power supply side current and the current source according to the single-phase equivalent circuit specifically includes:
calculating the power supply impedance in the single-phase equivalent circuit:
ZS＝RS+sLS；
wherein R isSIs a power supply resistor, LSIs a power supply inductor;
calculating according to a first formula to obtain a transfer function;
wherein the first formula is:
Figure BDA0002216389220000021
wherein icL(s) is a current source, iL(s) is the load side current, ic(s) is the current from APF, iS(s) is the power supply side current, GZ(s) is a transfer function, GA(s) is the transfer function of the compensating current generator, GI(s) is the transfer function of the command current arithmetic circuit.
A third aspect of the present application provides a control device of an active power filter system, which is applied to the power filter device of the first aspect, and which takes the sum of a load-side current and a current generated by an APF as a current source, including:
the formulating unit is used for formulating a single-phase equivalent circuit reflecting the HPF and the power supply impedance;
the calculation unit is used for calculating a transfer function between the power supply side current and the current source according to the single-phase equivalent circuit;
and the compensation unit is used for selecting the power supply current control circuit or the load current control circuit to perform current compensation according to the transfer function.
Preferably, the single-phase equivalent circuit comprises a power supply side, a power supply resistor, a power supply inductor and the HPF which are connected in sequence to form a closed loop; the HPF is connected in parallel with the current source, the calculation unit comprising:
the first calculating subunit is used for calculating the power supply impedance in the single-phase equivalent circuit;
the second calculation subunit is used for calculating a transfer function according to the first formula;
wherein the first formula is:
Figure BDA0002216389220000031
wherein icL(s) is a current source, iL(s) is the load side current, ic(s) is the current from APF, iS(s) is the power supply side current, GZ(s) is a transfer function, GA(s) is the transfer function of the compensating current generator, GI(s) isThe transfer function of the instruction current arithmetic circuit.
A fourth aspect of the present application provides a control device of an active power filter system, the device including a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of the active power filter system according to the second aspect according to instructions in the program code.
A fifth aspect of the present application provides a computer-readable storage medium for storing program code for executing the control method of the active power filter system according to the second aspect.
A sixth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of controlling an active power filter system according to the second aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
in an embodiment of the present application, an active power filter system is provided, which includes a power supply current control circuit and a load current control circuit; the power supply current control circuit comprises a power supply side and a power supply impedance; the load current control circuit includes a HPF (high pass filter), an APF (active filter), and a load side; the APF comprises an instruction current operation circuit, a current tracking control circuit, a driving circuit and a main circuit which are sequentially connected in series from a load side to a power supply side; the power supply side is electrically connected with the instruction current arithmetic circuit.
Load side current iLAs the input signal of the instruction current arithmetic circuit, namely the input signal of the instruction current arithmetic circuit is directly taken from the load side, therefore, the compensation current to be sent can quickly follow the instruction signalHowever, some higher harmonics are generated during the high frequency switching of the main circuit components, and pass throughA high-pass filter (HPF) is arranged in the active power filter system and can effectively filter the higher harmonics. Meanwhile, the main task and final purpose of the active filter (APF) is to make the current on the power supply side as close to a sine wave as possible, so that the current on the power supply side can be directly detected as the starting point of the scheme, and the current i on the power supply side is firstly calculatedSThen multiplying the harmonic by-1 to be used as a command signal
Figure BDA0002216389220000042
And controlling a following tracking module to improve the filtering quality.
The active power filter system provided by the embodiment of the application has the advantages that the power supply current control circuit and the load current control circuit share the instruction current operation circuit, the current tracking control circuit, the driving circuit and the main circuit, so that an APF (active power filter) can track the change of load harmonic current quickly, the influence of power grid frequency and power supply harmonic voltage fluctuation is inhibited, the problem of abnormal work of electrical equipment caused by harmonic voltage fluctuation is solved, the working performance of a hybrid active power filter is effectively improved, and the reliability is high.
Drawings
Fig. 1 is a schematic structural diagram of an active power filter system according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a method of controlling an active power filter system according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a single-phase equivalent circuit provided in an embodiment of the present application;
fig. 4 is a schematic diagram of an operation of a compensation current generating circuit according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a load current control circuit according to an embodiment of the present disclosure;
fig. 6 is a block diagram of a power supply current control circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a control device of an active power filter system according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A first aspect of the present application provides an active power filter system.
For easy understanding, please refer to fig. 1, fig. 1 is a schematic structural diagram of an active power filter system in an embodiment of the present application, and as shown in fig. 1, the schematic structural diagram specifically includes:
the power supply comprises a power supply current control circuit and a load current control circuit; the power supply current control circuit comprises a power supply side and a power supply impedance; the load current control circuit includes a HPF (high pass filter), an APF (active filter), and a load side; the APF comprises an instruction current operation circuit, a current tracking control circuit, a driving circuit and a main circuit which are sequentially connected in series from a load side to a power supply side; the power supply side is electrically connected with the instruction current arithmetic circuit.
Load side current iLAs the input signal of the instruction current arithmetic circuit, namely the input signal of the instruction current arithmetic circuit is directly taken from the load side, therefore, the compensation current to be sent can quickly follow the instruction signal
Figure BDA0002216389220000051
However, some higher harmonics are generated during the high frequency on/off process of the main circuit element, and can be effectively filtered by providing a High Pass Filter (HPF) in the active power filter system. Meanwhile, the main task and final purpose of the active filter (APF) is to make the current on the power supply side as close to a sine wave as possible, so that the current on the power supply side can be directly detected as the starting point of the scheme, and the current i on the power supply side is firstly calculatedSThen multiplying the harmonic by-1 to be used as a command signal
Figure BDA0002216389220000052
And controlling a following tracking module to improve the filtering quality.
The active power filter system provided by the embodiment of the application has the advantages that the power supply current control circuit and the load current control circuit share the instruction current operation circuit, the current tracking control circuit, the driving circuit and the main circuit, so that an APF (active power filter) can track the change of load harmonic current quickly, the influence of power grid frequency and power supply harmonic voltage fluctuation is inhibited, the problem of abnormal work of electrical equipment caused by harmonic voltage fluctuation is solved, the working performance of a hybrid active power filter is effectively improved, and the reliability is high.
The second aspect of the present application provides a control method of an active power filter system.
For easy understanding, please refer to fig. 2, and fig. 2 is a flowchart illustrating a method of controlling an active power filter system according to an embodiment of the present disclosure.
In this embodiment, the control method of the active power filter system is applied to the power filter device provided in the first aspect, and the load-side current i is measured as shown in fig. 1LAnd the current i emitted by the APFcSum icLAs a current source.
The method comprises the following steps:
101. a single-phase equivalent circuit reflecting the HPF and the power supply impedance is established.
As shown in FIG. 3, a reflection HPF and a power supply impedance Z are establishedSThe single-phase equivalent circuit of (1). Specifically, the single-phase equivalent circuit comprises a power supply side and a power supply resistor R which are sequentially connected to form a closed loopSPower supply inductor LSAnd a HPF; the HPF is connected in parallel with a current source. The HPF comprises a filter resistor R, a filter inductor L and a filter capacitor C; the filter resistor R is connected with the filter inductor L in parallel and then connected with the filter capacitor C in series.
102. And calculating a transfer function between the current at the power supply side and the current source according to the single-phase equivalent circuit.
Calculating a transfer function G between the current at the power supply side and the current source according to the single-phase equivalent circuitZ(s) is specifically:
calculating the power supply impedance Z in a single-phase equivalent circuitS：ZS＝RS+sLS；
Calculating a transfer function according to the following first formula;
wherein the first formula is:
in the formula icL(s) is a current source, iL(s) is the load side current, ic(s) is the current from APF, iS(s) is the power supply side current, GZ(s) is a transfer function, GA(s) is the transfer function of the compensating current generating circuit, GI(s) is the transfer function of the command current arithmetic circuit. The operation schematic diagram of the compensation current generation circuit is shown in fig. 4.
The structural block diagram of the load current control circuit of the power filter obtained by using the above formula is shown in fig. 5, and the structural block diagram of the power supply current control circuit is shown in fig. 6.
And calculating to obtain:
Figure BDA0002216389220000062
in the formula, ZHPFImpedance of the high-pass filter HPF, a0＝b0，
Figure BDA0002216389220000063
Figure BDA0002216389220000064
103. And selecting a power supply current control circuit or a load current control circuit according to the transfer function for current compensation.
According to the calculated transfer function GZAnd(s) selecting the power supply current control circuit or the load current control circuit to perform current compensation and suppress filtering. Preferably, the current tracking control circuit control method is a PWM control method, and specifically, the PWM control method includes a comparison method and a triangular wave comparison method.
As shown in the figureA third aspect of the present application provides a control device of an active power filter system, which is applied to the power filter device provided in the first aspect, and is used for applying a load-side current i as shown in fig. 1LAnd the current i emitted by the APFcSum icLAs a current source. The method comprises the following steps:
the formulating unit 201 is used for formulating a single-phase equivalent circuit reflecting the HPF and the power supply impedance;
a calculating unit 202, configured to calculate a transfer function between the power source side current and the current source according to the single-phase equivalent circuit;
and a compensation unit 203 for selecting the power supply current control circuit or the load current control circuit according to the transfer function to perform current compensation.
Specifically, the single-phase equivalent circuit comprises a power supply side, a power supply resistor, a power supply inductor and a HPF which are sequentially connected to form a closed loop; the HPF is connected in parallel to the current source, and the calculating unit 201 specifically includes:
a first calculation subunit 2011, configured to calculate a power supply impedance in the single-phase equivalent circuit;
the second calculating subunit 2012 is configured to calculate a transfer function according to the first formula;
wherein the first formula is:
Figure BDA0002216389220000071
wherein icL(s) is a current source, iL(s) is the load side current, ic(s) is the current from APF, iS(s) is the power supply side current, GZ(s) is a transfer function, GA(s) is the transfer function of the compensating current generating circuit, GI(s) is the transfer function of the command current arithmetic circuit.
A fourth aspect of the present application provides a control device of an active power filter system, the device including a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is for controlling the active power filter system of the second aspect as described above according to instructions in the program code.
A fifth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is configured to store program codes for executing the control method of the active power filter system according to the second aspect.
A fifth aspect of the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the method of controlling an active power filter system as described above in the second aspect.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. An active power filter system, comprising a supply current control circuit and a load current control circuit;
the power supply current control circuit comprises a power supply side and a power supply impedance;
the load current control circuit comprises a HPF, an APF and a load side;
the APF comprises an instruction current operation circuit, a current tracking control circuit, a driving circuit and a main circuit which are sequentially connected in series from a load side to a power supply side;
the power supply side is electrically connected to the command current arithmetic circuit.
2. A control method of an active power filter system, which is applied to the power filter device of claim 1, and which takes the sum of a load-side current and a current generated by an APF as a current source;
the method comprises the following steps:
formulating a single-phase equivalent circuit reflecting the HPF and the power supply impedance;
calculating a transfer function between the current at the power supply side and the current source according to the single-phase equivalent circuit;
and selecting a power supply current control circuit or a load current control circuit for current compensation according to the transfer function.
3. The active power filter system control method of claim 2, wherein the single-phase equivalent circuit comprises a power supply side, a power supply resistor, a power supply inductor and the HPF which are connected in sequence to form a closed loop; the HPF is connected in parallel with the current source.
4. The active power filter system control method of claim 3, wherein the HPF comprises a filter resistance, a filter inductance, and a filter capacitance;
and the filter resistor is connected with the filter inductor in parallel and then connected with the filter capacitor in series.
5. The method according to claim 3, wherein the calculating a transfer function between the power supply side current and the current source according to the single-phase equivalent circuit is specifically:
calculating the power supply impedance in the single-phase equivalent circuit:
ZS＝RS+sLS；
wherein R isSIs a power supply resistor, LSIs a power supply inductor;
calculating according to a first formula to obtain a transfer function;
wherein the first formula is:
Figure FDA0002216389210000021
wherein icL(s) is a current source, iL(s) is the load sideCurrent, ic(s) is the current from APF, iS(s) is the power supply side current, GZ(s) is the transfer function between the current on the power supply side and the current source, GA(s) is the transfer function of the compensating current generator, GI(s) is the transfer function of the command current arithmetic circuit.
6. A control device of an active power filter system, applied to the power filter device according to claim 1, wherein the sum of a load-side current and a current generated by an APF is used as a current source, and the control device comprises:
the formulating unit is used for formulating a single-phase equivalent circuit reflecting the HPF and the power supply impedance;
the calculation unit is used for calculating a transfer function between the power supply side current and the current source according to the single-phase equivalent circuit;
and the compensation unit is used for selecting the power supply current control circuit or the load current control circuit to perform current compensation according to the transfer function.
7. The control device of the active power filter system according to claim 6, wherein the calculation unit includes:
the first calculating subunit is used for calculating the power supply impedance in the single-phase equivalent circuit;
the second calculation subunit is used for calculating a transfer function according to the first formula;
wherein the first formula is:
Figure FDA0002216389210000022
wherein icL(s) is a current source, iL(s) is the load side current, ic(s) is the current from APF, iS(s) is the power supply side current, GZ(s) is a transfer function, GA(s) is the transfer function of the compensating current generator, GI(s) is the transfer function of the command current arithmetic circuit.
8. A control device for an active power filter system, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of the active power filter system according to any one of claims 2 to 5 according to instructions in the program code.
9. A computer-readable storage medium for storing a program code for executing the control method of the active power filter system according to any one of claims 2 to 5.
10. A computer program product comprising instructions that, when run on a computer, cause the computer to perform the method of controlling an active power filter system of any of claims 2-5.
CN201910916982.1A 2019-09-26 2019-09-26 Active power filtering system and control method thereof and related equipment Pending CN110635491A (en)

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Publication number Priority date Publication date Assignee Title
JP2014175883A (en) * 2013-03-11 2014-09-22 Onkyo Corp Channel divider and sound reproduction system including the same
CN204179665U (en) * 2014-03-14 2015-02-25 安工电子技术(北京)有限公司 A kind of Active Power Filter-APF
CN106602558A (en) * 2016-12-02 2017-04-26 安徽波维电子科技有限公司 Parallel active filter control system

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Application publication date: 20191231