CN105633969B - A kind of active filter supply harmonic compensation system and method - Google Patents
A kind of active filter supply harmonic compensation system and method Download PDFInfo
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- CN105633969B CN105633969B CN201610191185.8A CN201610191185A CN105633969B CN 105633969 B CN105633969 B CN 105633969B CN 201610191185 A CN201610191185 A CN 201610191185A CN 105633969 B CN105633969 B CN 105633969B
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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
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- 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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Abstract
The invention discloses a kind of active filter supply harmonic compensation system, including filter unit, voltage harmonic detection unit, harmonic impedance computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit, the filter unit connect power network output end；The voltage harmonic detection unit connects power network output end；The harmonic impedance computing unit connects the filter unit output end；The voltage harmonic compensation calculation unit connects the voltage harmonic detection unit and the harmonic impedance computing unit；Load current harmonic detecting unit is connected by current transformer and loaded；The comprehensive compensation unit connects the voltage harmonic compensation calculation unit, the load current harmonic detecting unit.A kind of active filter supply harmonic compensation system of the present invention is calculated by the harmonic current introduced to wave filter itself, and integrated load side harmonic current compensates to circuit so that power-supply filter filtering performance improves.
Description
Technical field
The present invention relates to wave filter power supply, more particularly to a kind of active filter supply harmonic compensation system and method.
Background technology
Active Power Filter-APF main function is the harmonic current of compensation electrical load, passes through the electric current installed in load-side
The harmonic current of transformer detection load exports reverse harmonic current as instruction control wave filter, and then makes grid side electric current
Without harmonic wave.
It is general to use in order to reduce the high frequency ripple that wave filter exports in itself when carrying out Design of Active Power Filter
LCL exports filtering mode.Due to capacitor filtering C introducing, certain low frequency capacitive reactance characteristic will be presented in electrical network access point, in electricity
During net on-load voltage, it will cause the inflow of reactive current, when particularly line voltage has harmonic distortion, it will introduce certain
Harmonic current, deepen the distortion of power network current.In current most industry spot, because band load is heavier, site environment voltage is abnormal
Become also more serious, Active Power Filter-APF can compensate for the harmonic current of load；That is, power-supply filter be filtered when
Waiting itself can also produce harmonic current, but the harmonic current that prior art does not introduce to wave filter itself compensates, and makes
It is poor to obtain power-supply filter filtering performance.
The content of the invention
The invention reside in the above-mentioned deficiency for overcoming prior art, there is provided a kind of harmonic wave electricity that can be introduced to wave filter itself
Stream compensates so that the active filter supply harmonic compensation system and method that power-supply filter filtering performance improves.
In order to realize foregoing invention purpose, the technical solution adopted by the present invention is：
A kind of active filter supply harmonic compensation system, including filter unit, voltage harmonic detection unit, harmonic impedance
Computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit,
The filter unit connects power network output end, for being filtered to the voltage that power network inputs；
The voltage harmonic detection unit connects power network output end, and the voltage for power network to be inputted is decomposed, obtained
Fundamental voltage and n times harmonic voltage；
The harmonic impedance computing unit connects the filter unit output end, for calculating the filter unit in harmonic wave
Impedance when number is N；
The voltage harmonic compensation calculation unit connects the voltage harmonic detection unit and calculates list with the harmonic impedance
Member, for according to the fundamental voltage and n times harmonic voltage, the impedance when overtone order is N, n times corresponding to calculating
Harmonic current, and the individual harmonic current of the corresponding n times harmonic current is synthesized into wave filter harmonic current；
Load current harmonic detecting unit is connected by current transformer and loaded, the n times harmonic wave for detection stream overload
Electric current, the individual harmonic current of n times harmonic current caused by the load is synthesized into load harmonic current；
The comprehensive compensation unit connects the voltage harmonic compensation calculation unit, the load current harmonic detecting list
Member, for being overlapped to the wave filter harmonic current, the load harmonic current, obtain integrating harmonic current, and according to
The comprehensive harmonic current compensates to load；
Wherein N is the positive integer more than 1.
Further, the filter unit includes the first inductance, the second inductance, electric capacity, first inductance and described the
Two inductance are connected, and first inductance is also connected with power network output end, and the electric capacity is in parallel and first inductance is in described second
Between inductance.
Further, the filter unit also includes resistance, and the resistance is connected with the electric capacity, the harmonic impedance meter
Unit is calculated to be used to calculate the impedance of first inductance, the electric capacity, the circuit of inductance composition when overtone order is N.
Present invention simultaneously provides a kind of active filter supply harmonic compensation method, comprise the following steps：
The individual harmonic current of the electric current of detection stream overload, and to the individual harmonic current of the electric current for flowing through load
Superposition, obtains load harmonic current；
Individual harmonic current caused by filter circuit is calculated, and individual harmonic current caused by the filter circuit is folded
Add, obtain filter circuit harmonic current；
The load harmonic current is added to obtain with the wave filter harmonic current and integrates harmonic current, according to described comprehensive
Harmonic current is closed to compensate load.
Further, individual harmonic current caused by the calculating filter circuit includes：
Detect each harmonic voltage of the filter circuit input；
Detect impedance corresponding to each harmonic voltage of the filter circuit；
According to impedance computation filter circuit each harmonic corresponding to each harmonic voltage and each harmonic voltage
Corresponding electric current.
Further, stating filter circuit includes the first inductance, the second inductance, electric capacity, first inductance and described second
Inductance is connected, and first inductance is also connected with power network output end, and the electric capacity is in parallel electric in described second with first inductance
Between sense.
Further, the filter circuit also includes resistance, and the resistance is connected with the electric capacity, detects the filtered electrical
Impedance corresponding to each harmonic voltage on road is to detect first inductance, the electric capacity, the circuit of inductance composition humorous
Impedance when ripple number is N.
Further, each harmonic voltage is calculated with the individual harmonic current using fft algorithm, harmonic wave resistance
Anti- calculation formula is：
Wherein L1For the inductance value of first inductance, C is the capacitance of the electric capacity, R
For the resistance value of the resistance, w is each harmonic angular frequency.
Further, as R=0, the calculation formula of the harmonic impedance is used to calculate impedance of fundamental frequency, and according to fundamental wave electricity
Pressure calculates fundamental reactive current with the impedance of fundamental frequency, and load is compensated.
Compared with prior art, beneficial effects of the present invention
A kind of active filter supply harmonic compensation system of the present invention passes through the harmonic current that is introduced to wave filter itself
Calculated, and integrated load side harmonic current compensates to circuit so that power-supply filter filtering performance improves.
Brief description of the drawings
It is a kind of active filter supply harmonic compensation system module frame chart of the present invention shown in Fig. 1.
It is a kind of active filter supply harmonic compensation system structure chart of the present invention shown in Fig. 2.
It is a kind of active filter supply harmonic compensation method FB(flow block) of the present invention shown in Fig. 3.
It is the single harmonic component voltage decomposition in a specific embodiment of the invention and harmonic impedance calculating signal shown in Fig. 4
Figure.
Embodiment
With reference to embodiment, the present invention is described in further detail.But this should not be interpreted as to the present invention
The scope of above-mentioned theme is only limitted to following embodiment, all models that the present invention is belonged to based on the technology that present invention is realized
Enclose.
Be shown in Fig. 1 the present invention a kind of active filter supply harmonic compensation system module frame chart, including filter unit,
Voltage harmonic detection unit, harmonic impedance computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit,
Comprehensive compensation unit,
The filter unit connects power network output end, for being filtered to the voltage that power network inputs；
The voltage harmonic detection unit connects power network output end, and the voltage for power network to be inputted is decomposed, obtained
Fundamental voltage and n times harmonic voltage；
The harmonic impedance computing unit connects the filter unit output end, for calculating the filter unit in harmonic wave
Impedance when number is N；
The voltage harmonic compensation calculation unit connects the voltage harmonic detection unit and calculates list with the harmonic impedance
Member, for according to the fundamental voltage and n times harmonic voltage, the impedance when overtone order is N, n times corresponding to calculating
Harmonic current, and the individual harmonic current of the corresponding n times harmonic current is synthesized into wave filter harmonic current；
Load current harmonic detecting unit is connected by current transformer and loaded, the n times harmonic wave for detection stream overload
Electric current, the individual harmonic current of n times harmonic current caused by the load is synthesized into load harmonic current；
The comprehensive compensation unit connects the voltage harmonic compensation calculation unit, the load current harmonic detecting list
Member, for being overlapped to the wave filter harmonic current, the load harmonic current, obtain integrating harmonic current, and according to
The comprehensive harmonic current compensates to load；
Wherein N is the positive integer more than 1.
A kind of active filter supply harmonic compensation system of the present invention passes through the harmonic current that is introduced to wave filter itself
Calculated, and integrated load side harmonic current compensates to circuit so that power-supply filter filtering performance improves.
In a specific embodiment referring to Fig. 2, the filter unit includes the first inductance, the second inductance, electric capacity, described
First inductance is connected with second inductance, and first inductance is also connected with power network output end, and the electric capacity is in parallel with described the
One inductance is between second inductance.
The filter unit also includes resistance, and the resistance is connected with the electric capacity, and the harmonic impedance computing unit is used
In impedance of the circuit that calculating first inductance, the electric capacity, the inductance form when overtone order is N.
Active Power Filter-APF uses LCL filtering modes, will not be because of industry spot electricity after importing system power bus
The distortion of net voltage and introduce harmonic current, compensation effect is more preferable.
Present invention simultaneously provides a kind of active filter supply harmonic compensation method, comprise the following steps：
The individual harmonic current of the electric current of detection stream overload, and to the individual harmonic current of the electric current for flowing through load
Superposition, obtains load harmonic current；
Individual harmonic current caused by filter circuit is calculated, and individual harmonic current caused by the filter circuit is folded
Add, obtain filter circuit harmonic current；
The load harmonic current is added to obtain with the wave filter harmonic current and integrates harmonic current, according to described comprehensive
Harmonic current is closed to compensate load.
Further, individual harmonic current caused by the calculating filter circuit includes：
Detect each harmonic voltage of the filter circuit input；
Detect impedance corresponding to each harmonic voltage of the filter circuit；
According to impedance computation filter circuit each harmonic corresponding to each harmonic voltage and each harmonic voltage
Corresponding electric current.
Further, stating filter circuit includes the first inductance, the second inductance, electric capacity, first inductance and described second
Inductance is connected, and first inductance is also connected with power network output end, and the electric capacity is in parallel electric in described second with first inductance
Between sense.
Further, the filter circuit also includes resistance, and the resistance is connected with the electric capacity, detects the filtered electrical
Impedance corresponding to each harmonic voltage on road is to detect first inductance, the electric capacity, the circuit of inductance composition humorous
Impedance when ripple number is N.
Further, each harmonic voltage is calculated with the individual harmonic current using fft algorithm, harmonic wave resistance
Anti- calculation formula is：
Wherein L1For the inductance value of first inductance, C is the capacitance of the electric capacity, and R is
The resistance value of the resistance, w are each harmonic angular frequency.
Further, as R=0, the calculation formula of the harmonic impedance is used to calculate impedance of fundamental frequency, and according to fundamental wave electricity
Pressure calculates fundamental reactive current with the impedance of fundamental frequency, and load is compensated.
Embodiment 1：
Present embodiment illustrates the power network for 50Hz frequencies, 5 subharmonic currents that Active Power Filter-APF is introduced into
Calculate, specifically referring to Fig. 4, Fig. 4 is the fundamental voltage V1n=1 and quintuple harmonics voltage decomposited
V2n=5.Harmonic impedance loop is made up of L1, C and R, and its impedance isFor active electrical
For force filter, L1, C and R are fixed design parameters, are used directly for calculating its impedance parameter for every subharmonic
Value.W is each harmonic angular frequency, therefore w=2 π f, f are harmonic frequency.
5 subharmonic current computational methods are：
Harmonic impedanceBring into wave filter design L1,
C and R parameter will obtain 5 subharmonic impedance Zs 5, thus give the harmonic current that can calculate 5 timesBy this
Given 5 subharmonic currents with the detection of load-side current transformer of harmonic current integrate, after exactly adding Active Power Filter-APF
Whole 5 subharmonic currents of power system altogether.By that analogy, the individual harmonic current that Active Power Filter-APF introduces can
Calculate in this way and comprehensive.
By this compensation method, Active Power Filter-APF uses LCL filtering modes, will after importing system power bus
Harmonic current will not be introduced because of the distortion of industry spot line voltage, it is effective to solve active electrical during load-side current detecting
The compensation problem for the harmonic current that force filter power supply introduces, compensation effect is more preferable, and without any hardware cost of increase.
Not just for harmonic current, this method can also calculate the fundamental wave reactive power of Active Power Filter-APF introducing, due to
L1 and R are smaller during system design, therefore big capacitive reactance is mainly presented for fundamental wave for Active Power Filter-APF LCL loops, are entering
The negligible watt current flowed into when row fundamental wave calculates, that is, ignore R (R=0), thenPass through voltage
Harmonic detecting module, fundamental voltage is calculated using FFT, fundamental wave reactive power electricity is finally calculated by fundamental voltage and impedance of fundamental frequency Z1
I1 is flowed, gives fundamental reactive current i1 to the closed loop controller fundamental reactive current that compensation active electric power filter introduces.
The present invention can not only compensate the harmonic pollution of introducing, while can also compensate the capacitive reactive power electric current of absorption.
The embodiment of the present invention is described in detail above in conjunction with accompanying drawing, but the present invention is not restricted to
Embodiment is stated, in the case of the spirit and scope of claims hereof are not departed from, those skilled in the art can make
Go out various modifications or remodeling.
Claims (9)
1. a kind of active filter supply harmonic compensation system, it is characterised in that single including filter unit, voltage harmonic detection
Member, harmonic impedance computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit,
The filter unit connects power network output end, for being filtered to the voltage that power network inputs；
The voltage harmonic detection unit connects power network output end, and the voltage for power network to be inputted is decomposed, and obtains fundamental wave
Voltage and n times harmonic voltage；
The harmonic impedance computing unit connects the filter unit output end, for calculating the filter unit in overtone order
For N when impedance；
The voltage harmonic compensation calculation unit connects the voltage harmonic detection unit and the harmonic impedance computing unit, uses
According to the fundamental voltage and n times harmonic voltage, the impedance when overtone order is N, n times harmonic wave corresponding to calculating is electric
Stream, and the individual harmonic current of the corresponding n times harmonic current is synthesized into wave filter harmonic current；
Load current harmonic detecting unit is connected by current transformer and loaded, for the n times harmonic current of detection stream overload,
The individual harmonic current of n times harmonic current caused by the load is synthesized into load harmonic current；
The comprehensive compensation unit connects the voltage harmonic compensation calculation unit, the load current harmonic detecting unit, uses
It is overlapped in the wave filter harmonic current, the load harmonic current, obtains integrating harmonic current, and according to described comprehensive
Harmonic current is closed to compensate load；
Wherein N is the positive integer more than 1.
A kind of 2. active filter supply harmonic compensation system according to claim 1, it is characterised in that the filter unit
Including the first inductance, the second inductance, electric capacity, first inductance is connected with second inductance, and first inductance is also connected with
Power network output end, the electric capacity are parallel between first inductance and second inductance.
A kind of 3. active filter supply harmonic compensation system according to claim 2, it is characterised in that the filter unit
Also include resistance, the resistance is connected with the electric capacity, and the harmonic impedance computing unit is used to calculate first inductance, institute
State the impedance of electric capacity, the circuit of resistance composition when overtone order is N.
4. a kind of active filter supply harmonic compensation method, it is characterised in that comprise the following steps：
The individual harmonic current of the electric current of detection stream overload, and the individual harmonic current of the electric current for flowing through load is folded
Add, obtain load harmonic current；
Individual harmonic current caused by filter circuit is calculated, and individual harmonic current caused by the filter circuit is superimposed, is obtained
To filter circuit harmonic current；
The load harmonic current is added to obtain with the wave filter harmonic current and integrates harmonic current, it is humorous according to the synthesis
Ripple electric current compensates to load.
5. a kind of active filter supply harmonic compensation method according to claim 4, it is characterised in that described to calculate filter
Individual harmonic current includes caused by wave circuit：
Detect each harmonic voltage of the filter circuit input；
Detect impedance corresponding to each harmonic voltage of the filter circuit；
It is corresponding according to impedance computation filter circuit each harmonic corresponding to each harmonic voltage and each harmonic voltage
Electric current.
6. a kind of active filter supply harmonic compensation method according to claim 5, it is characterised in that state filter circuit
Including the first inductance, the second inductance, electric capacity, first inductance is connected with second inductance, and first inductance is also connected with
Power network output end, the electric capacity are parallel between first inductance and second inductance.
A kind of 7. active filter supply harmonic compensation method according to claim 6, it is characterised in that the filter circuit
Also include resistance, the resistance is connected with the electric capacity；
Impedance corresponding to each harmonic voltage of the detection filter circuit be detect first inductance, the electric capacity,
Impedance of the circuit of the resistance composition when overtone order is N.
8. a kind of active filter supply harmonic compensation method according to claim 7, it is characterised in that described each time humorous
Wave voltage is calculated with the individual harmonic current using fft algorithm, and the calculation formula of harmonic impedance is：
Wherein L1For the inductance value of first inductance, C is the capacitance of the electric capacity, and R is described
The resistance value of resistance, w are each harmonic angular frequency.
A kind of 9. active filter supply harmonic compensation method according to claim 8, it is characterised in that as R=0,
The calculation formula of the harmonic impedance is used to calculate impedance of fundamental frequency, and according to fundamental voltage and the impedance of fundamental frequency calculate fundamental wave without
Work(electric current, load is compensated.
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| CN106992765A (en) * | 2017-04-18 | 2017-07-28 | 河北工业大学 | The method of the lower reduction inductive circuit impedance value of harmonic current excitation |
| CN108390386A (en) * | 2018-05-18 | 2018-08-10 | 江苏伊莱尔电力科技有限公司 | A kind of Active Power Filter-APF supply harmonic compensation system and method |
| CN116260191B (en) * | 2023-05-16 | 2023-07-28 | 北京金风科创风电设备有限公司 | Grid-connected control method, device, equipment and medium of wind generating set |
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| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN104600705A (en) * | 2015-02-06 | 2015-05-06 | 国家电网公司 | Active power filter based on inverter side current feedback and current control method of active power filter |
| CN205453129U (en) * | 2016-03-29 | 2016-08-10 | 四川英杰电气股份有限公司 | Active filter power harmonic compensation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3305420B2 (en) * | 1993-06-11 | 2002-07-22 | 富士電機株式会社 | Active filter |
| US5691626A (en) * | 1995-06-07 | 1997-11-25 | General Electric Company | Active damping control for active power filter |
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- 2016-03-29 CN CN201610191185.8A patent/CN105633969B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN104600705A (en) * | 2015-02-06 | 2015-05-06 | 国家电网公司 | Active power filter based on inverter side current feedback and current control method of active power filter |
| CN205453129U (en) * | 2016-03-29 | 2016-08-10 | 四川英杰电气股份有限公司 | Active filter power harmonic compensation system |
Non-Patent Citations (1)
| Title |
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| "Ddesign and Implementation of Compound Current Control Strategy for Improved LCL-based Shunt Active Power Filter";XiaoJian Zhong; Lei Hong; Xiao Chen; Guozhu Chen;《IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society》;20121231;pp.339-344 * |
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