CN100486074C - Control method for the mixing compensation system of the active power filter and parallel capacitor - Google Patents
Control method for the mixing compensation system of the active power filter and parallel capacitor Download PDFInfo
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- CN100486074C CN100486074C CNB2006101052028A CN200610105202A CN100486074C CN 100486074 C CN100486074 C CN 100486074C CN B2006101052028 A CNB2006101052028 A CN B2006101052028A CN 200610105202 A CN200610105202 A CN 200610105202A CN 100486074 C CN100486074 C CN 100486074C
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
This invention relates to one parallel source filter and its mixture compensation system control method, wherein, when the filter testes load current, the filter tests the electrical network voltage and load current resonance component; the test load current is to control source power filter needed resonance wave; the test network voltage controls the source power filter into one resonance resistance with resonance wave value as set.
Description
Technical field
The invention belongs to the application category of power quality controlling, be specifically related to the control method of the mixed type bucking-out system of a kind of parallel connection type active electric filter and shunt capacitor composition.
Background technology
Along with the raising that the development of power electronic technology and people require the quality of power supply, parallel connection type active electric filter gets more and more people's extensive concerning with its superior power quality controlling performance, and progressively moves towards practicability.Generally all adopt shunt capacitor to carry out reactive power compensation in China's low-voltage distribution system simultaneously.In the real system, because idle capacitor installation group number is more, and the position disperses flexibly, after parallel connection type active electric filter is used for system, when parallel connection type active electric filter uses the control method that detects load current, its detected load current will inevitably comprise the electric current of shunt capacitor, and this moment, there was the contradiction between stability and the harmonic suppression effect in mixing compensation system.According to the data-searching that the applicant carried out, up to now, at also not proposing comparatively practical and reliable method in this situation prior art, basic just the subtracting each other by the detected current phasor of many covers instrument transformer of research at present draws the electric current that active filter should send, and the occasion that the method is more at capacitor group number and the installation site disperses and inapplicable.
Below provide the pertinent literature of retrieval:
[1] Qin Jie, Wang Dawei, active filter operation technique in parallel, electrical technology, 2006 the 8th phases with reactive power compensator.
Summary of the invention
The objective of the invention is to, provide the control method of the mixed type bucking-out system that a kind of parallel connection type active electric filter and shunt capacitor form, to improve the stability of a system and the compensation effect of the mixing compensation system that parallel connection type active electric filter and shunt capacitor form.
In order to realize above-mentioned task, the present invention takes following technical solution:
The control method of the mixed type bucking-out system that a kind of parallel connection type active electric filter and shunt capacitor are formed, it is characterized in that: when comprising the electric current of shunt capacitor in the load current that parallel connection type active electric filter detected, the harmonic components in parallel connection type active electric filter while detection of grid voltage and the load current; Detect load current and be used to control the harmonic wave that Active Power Filter-APF is exported required compensation; Harmonic components in the detection of grid voltage, control the corresponding electric current of Active Power Filter-APF output as one of active electric power filter to output current controlled quentity controlled variable, resistance is the infinitely-great resistance of resistance on the definite value first-harmonic on the Active Power Filter-APF harmonic wave frequency range in parallel in order to give in equivalence, thereby the inhibition system resonance improves the stability of a system; With load current harmonic components corresponding instruction component and the output of the corresponding instruction of Voltage Harmonic composition component stack back control Active Power Filter-APF, improve the stability of a system and compensation effect.
Method of the present invention can detect load current and line voltage simultaneously, and is simple and reliable and need not increase extra hardware cost, can make stable that system becomes, and have perfect compensation effect.
Method of the present invention is with respect to traditional parallel connection type active electric filter control method, and this method has only increased Voltage Harmonic and detected link.Owing to just need detect line voltage in the phase-locked link of device itself, so this method do not need to increase any hardware, need add the Voltage Harmonic detection algorithm in software to get final product.The present invention will promote the practicalization of active power filtering technology greatly.
Description of drawings
Fig. 1 is a system construction drawing of the present invention;
Fig. 2 parallel connection type active electric filter new type of control method schematic diagram;
Fig. 3 control system structure chart;
Fig. 4 detects and adopts system emulation waveform under traditional control method when electric current comprises condenser current;
Fig. 5 adopts system emulation waveform under the control method that the present invention proposes when detecting electric current and comprising condenser current;
Fig. 6 detects and adopts system experimentation waveform under traditional control method when electric current comprises condenser current;
Fig. 7 adopts system experimentation waveform under the control method that the present invention proposes when detecting electric current and comprising condenser current;
The present invention is described in further detail below in conjunction with example that accompanying drawing and inventor provide.
Embodiment
The control method of the mixed type bucking-out system that parallel connection type active electric filter and shunt capacitor are formed, when comprising the electric current of shunt capacitor in the load current that parallel connection type active electric filter detected, parallel connection type active electric filter is detection of grid voltage and load current (comprising or do not comprise condenser current all is suitable for) simultaneously, detects load current and is used to control the harmonic wave that Active Power Filter-APF is exported required compensation; Detection of grid voltage can be the Active Power Filter-APF equivalent control harmonic wave resistance (resistance is a certain value on the harmonic wave frequency range, resistance infinity on first-harmonic), thereby plays the effect that suppresses system resonance, improves the stability of a system.Two parts are instructed superimposed, can realize improving the purpose of the stability of a system and compensation effect.
The parallel connection type active electric filter system configuration of using the inventive method as shown in Figure 1, parallel connection type active electric filter comprises main circuit and control circuit two parts.Wherein, the current transformer that is made of synchrotrans (400/5), inlet wire reactor, IGBT of main circuit and other auxiliary equipment etc. are formed; Control circuit generates link, current tracking controlling unit and dc voltage governing loop etc. by current detecting link, instruction and forms.I among the figure
sThe expression power network current, z
sThe network impedance of expression electrical network, e
a, e
b, e
cThe line voltage of expression a, b, c three-phase, i
LExpression load current (comprising the compensation capacitors electric current), i
cThe output current of expression Active Power Filter-APF, L
rThe connection reactor of expression Active Power Filter-APF, i
fThe feedback current of expression Active Power Filter-APF, i
DcThe DC side electric current of expression Active Power Filter-APF, V
cExpression Active Power Filter-APF dc voltage, u
RefThe given reference value of expression Active Power Filter-APF dc voltage, i
Ch *The instruction of expression harmonic wave, i
Cf *Expression is used for the first-harmonic instruction of DC side control, i
c *Active Power Filter-APF instruction after expression is synthetic, e
PLLThe line voltage synchronizing signal that expression is obtained by phase-locked link.
The harmonic wave of line voltage detects with the harmonic wave detection implementation of load current identical, at first signal is sampled by A/D, the signal that in DSP sampling is obtained carries out the DFT analysis then, obtain 50Hz fundametal compoment wherein, by subtraction this fundametal compoment is rejected from the signal that sampling obtains then, can obtain the harmonic component in the signal, be translated into analog quantity as the harmonic wave operation part in the command signal of current tracking control by D/A at last.
The same with traditional parallel connection type active electric filter, Active Power Filter-APF is by connecting reactor L
rInsert electrical network in parallel; Synchrotrans (400/5) are used for detection of grid voltage, and its output signal can be used for the input that the harmonious wave voltage of phase-locked link detects link; Instruction generates link detected load current (electric current that comprises capacitor) and line voltage is analyzed, and extracts harmonic component wherein, and this part is realized by the DSP digital circuit; The dc voltage governing loop is used to regulate dc voltage, is generally pi regulator, and its input variable is the poor of dc voltage reference value and the dc voltage actual value that arrives by sensor, and this part is also realized by the DSP digital circuit; Instruction generation link and dc voltage governing loop institute call instruction sum are given as the current tracking controlling unit, after this given and value of feedback active electric power filter to output current are done difference, resultant signal compares with triangular wave and obtains pwm signal, and this part is realized by analog circuit.
The new type of control method schematic diagram that proposes among the present invention is seen Fig. 2.I among the figure
ClExpression detects the harmonic component in the load current that obtains, i
Cl *The instruction component of expression load harmonic current correspondence, u
ShExpression detects the harmonic component in the line voltage that obtains, i
Cv *Expression mains by harmonics voltage is right should instruct component, K
IdExpression current channel coefficient, K
vExpression voltage channel coefficient, i
c *Active Power Filter-APF instruction after expression is synthetic.
Detect the harmonic component i in the load current (comprising condenser current)
Cl, and control it as one of active electric power filter to output current controlled quentity controlled variable and export corresponding electric current
, this component is used for the compensation of system harmonics electric current; Harmonic component u in the detection of grid voltage
Sh, and control it as one of active electric power filter to output current controlled quentity controlled variable and export corresponding electric current
, this component can equivalence resistance is 1/K on harmonic wave frequency range of Active Power Filter-APF parallel connection in order to give
V, and the infinitely-great resistance of resistance on the first-harmonic, thereby changed system impedance, play the effect that suppresses system resonance, enhanced system stability.
Fig. 3 is the control system structure chart when having used new type of control method in the experimental system, i among the figure
1a, i
1b, i
1cThe load current of expression a, b, c three-phase, e
a, e
b, e
cThe line voltage of expression a, b, c three-phase, cos ω t, sin ω t are represented the line voltage synchronizing signal that obtained by phase-locked link, u
Cf, u
CrRepresent Active Power Filter-APF dc voltage value of feedback and set-point respectively, PI represents to be used for the pi regulator that dc voltage is regulated, i
Ac *, i
Bc *, i
Cc *Expression Active Power Filter-APF three-phase command signal, i
Ac, i
Bc, i
CcExpression Active Power Filter-APF three phase feedback signals.Wherein phase-locked loop is used to obtain the synchronizing signal with line voltage positive sequence component homophase; Harmonic wave detects I and detects link for the load harmonic current; It is mains by harmonics current detecting link that harmonic wave detects II; Low pass filter is used for the high fdrequency component that filtering is introduced in network voltage detection owing to the switching device action, and what adopt in the experimental system is 20 rank FIR filters of Digital Implementation, and corner frequency is 5kHz.In the experimental system, harmonic wave detects link and digital filter is realized by DSP, and current tracking control realizes by analog circuit.
Fig. 4 adopts system emulation waveform under traditional control method for detecting when electric current comprises condenser current, this moment, system was unstable as can be seen.
Fig. 5 is the simulation waveform when detecting the control method (detecting the controlling schemes that load current and supply voltage are controlled active electric power filter to output current simultaneously) that adopts the present invention's proposition when electric current comprises condenser current, adopt new controlling schemes can make the stable of system's change as seen from the figure, and desirable harmonic compensation effect is arranged.
Fig. 6 adopts system experimentation waveform under traditional control method for detecting when electric current comprises condenser current, among the figure, and U
S: 200V/div, I
S: 30A/div, I
L: 30A/div, I
C: 30A/div, t:10ms/div, wherein U
SThe expression line voltage, I
SThe expression power network current, I
LThe expression load current, I
CExpression active filter output current.Identical with simulation result as can be seen, this moment, system was unstable.
System experimentation waveform under the control method that employing the present invention proposed when Fig. 7 comprised condenser current for detecting electric current, among the figure, U
S: 200V/div, I
S: 30A/div, I
L: 30A/div, I
C: 30A/div, t:10ms/div adopts new controlling schemes can make original unsettled mixing compensation system become stable as can be seen, and good harmonic suppression effect is arranged simultaneously, and is consistent with simulation result.
By emulation and experimental result as can be known, adopt and detect the controlling schemes that load current and supply voltage are controlled active electric power filter to output current simultaneously, can realize improving the stability of a system of mixing compensation system and the purpose of compensation effect.
Claims (1)
1. the control method of the mixed type bucking-out system formed of parallel connection type active electric filter and shunt capacitor, it is characterized in that: when comprising the electric current of shunt capacitor in the load current that parallel connection type active electric filter detected, the harmonic components in parallel connection type active electric filter while detection of grid voltage and the load current; The harmonic components that detects in the load current is used to control the harmonic wave that Active Power Filter-APF is exported required compensation; Harmonic components in the detection of grid voltage, control the corresponding electric current of Active Power Filter-APF output as one of active electric power filter to output current controlled quentity controlled variable, resistance is the infinitely-great resistance of resistance on the definite value first-harmonic on the Active Power Filter-APF harmonic wave in parallel in order to give in equivalence, thereby the inhibition system resonance improves the stability of a system; With load current harmonic components corresponding instruction component and the output of the corresponding instruction of Voltage Harmonic composition component stack back control Active Power Filter-APF, improve the stability of a system and compensation effect.
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| CNB2006101052028A CN100486074C (en) | 2006-12-18 | 2006-12-18 | Control method for the mixing compensation system of the active power filter and parallel capacitor |
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| CNB2006101052028A CN100486074C (en) | 2006-12-18 | 2006-12-18 | Control method for the mixing compensation system of the active power filter and parallel capacitor |
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| CN100486074C true CN100486074C (en) | 2009-05-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101986497A (en) * | 2010-10-25 | 2011-03-16 | 上海磁浮交通发展有限公司 | Control compensation system and control method of quality of electric energy of magnetic suspension train |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924368B (en) * | 2010-09-08 | 2012-06-27 | 山东山大华天科技股份有限公司 | Active power filter device and control method thereof |
| CN103427419B (en) * | 2013-08-22 | 2016-04-20 | 陈锡忠 | Active power filter selective harmonic compensation control method |
| CN104393598B (en) * | 2014-11-24 | 2016-06-01 | 电子科技大学 | The frequency self-adaption modified version resonance control method of a kind of active power filtering device |
| CN105048463B (en) * | 2015-07-09 | 2017-04-19 | 泰州学院 | Capacitive current feedback-based HAPF resonant suppression method |
| CN106026094B (en) * | 2016-04-22 | 2018-08-31 | 南京亚派科技股份有限公司 | A kind of unbalance control algorithm applied to active filter |
| CN109149579B (en) * | 2018-09-25 | 2021-08-13 | 太原理工大学 | Control method for HAPF harmonic compensation and resonance suppression based on network side current sampling |
| CN111913040A (en) * | 2020-05-23 | 2020-11-10 | 青岛鼎信通讯股份有限公司 | Load switching and similarity-based line variation relation identification method for resonance points |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101986497A (en) * | 2010-10-25 | 2011-03-16 | 上海磁浮交通发展有限公司 | Control compensation system and control method of quality of electric energy of magnetic suspension train |
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Assignee: Jiangsu Zhongling Hi-Tech Development Co., Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2010320000511 Denomination of invention: Control method for the mixing compensation system of the active power filter and parallel capacitor Granted publication date: 20090506 License type: Exclusive License Open date: 20070711 Record date: 20100504 |
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Granted publication date: 20090506 Termination date: 20111218 |