CN101651347B - Parallel-connection type active power filter - Google Patents

Parallel-connection type active power filter Download PDF

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Publication number
CN101651347B
CN101651347B CN2009101833651A CN200910183365A CN101651347B CN 101651347 B CN101651347 B CN 101651347B CN 2009101833651 A CN2009101833651 A CN 2009101833651A CN 200910183365 A CN200910183365 A CN 200910183365A CN 101651347 B CN101651347 B CN 101651347B
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phase
filter
current
connection type
type active
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CN101651347A (en
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胡海兵
石巍
邢岩
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • 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
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    • Y02E40/20—Active power filtering [APF]

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Abstract

The invention discloses a parallel-connection type active power filter which belongs to the field of power harmonic wave suppression technology. The parallel-connection type active power filter comprises a three-phase filter inductor (10), a three-phase six-switch inverter (20) and a three-phase rectifier filter circuit, wherein the three-phase six-switch inverter (20) comprises a compensation three-phase inductor (21), a three-phase inverter (22) and a capacitor (23). Three-phase voltage of an external power grid is input to one end of the three-phase filter inductor (10), while the other end of the three-phase filter inductor (10) is respectively connected with the three-phase six-switch inverter (20) and the three-phase rectifier filter circuit. The parallel-connection type active power filter can effectively reduce the inductance value of the compensation three-phase inductor (21), improve the trace ability of current, improve the compensation property of the filter and has wide application prospect in the aspect of power grid harmonic wave treatment.

Description

A kind of parallel connection type active electric filter
Technical field
The present invention relates to a kind of parallel connection type active electric filter, belong to the power harmonic suppression technical field, be specially adapted to the intermediate frequency network system, also be applicable to the common frequency power network system.
Background technology
Development along with power electronic technology, the application of electronic equipment is more and more extensive, harmonic wave, idle, uneven aliquot have produced very large impact to AC network, had a strong impact on power supply quality, have reduced service behaviour and the useful life of generating equipment, power consumption equipment.Therefore, administer harmonic pollution in electric power net and become problem in the urgent need to address with the raising power supply quality.Active Power Filter-APF is as one of effective means of harmonic wave control, thereby studied widely.At present, use the Active Power Filter-APF technology of comparative maturity mainly take the parallel connection type structure as main, its topological structure as shown in Figure 1, usually control rectifying circuit brings larger di/dt in order to suppress not, AC at control rectifying circuit not adds three-phase filter inductance (40), the electric current that flows through this inductance comprises fundamental current and harmonic current, and inductor loss is larger.In addition, the inductance value of compensation side three pole reactor (50) is chosen and is wanted comprehensive current ripples and current tracking ability to consider in the Active Power Filter-APF main circuit.Inductance value diminishes, large, tracking load variations ability enhancing that current ripples becomes.Otherwise current ripples diminishes, follow-up control weakens.So, on the basis of certain output current ripple size, reduce to compensate the side three pole reactor, to improve the current tracking ability significant to improving the Active Power Filter-APF performance.
Summary of the invention
Goal of the invention:
The object of the invention is to propose a kind of parallel connection type active electric filter, effectively reduces the size of compensation side three pole reactor and improves filter current tracking ability, has improved simultaneously the compensation performance of parallel connection type active electric filter.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
Parallel connection type active electric filter of the present invention comprises three-phase filter inductance, three-phase six switching inverters and three phase rectifier filter circuit; The external electrical network three-phase voltage inputs to the input of three-phase filter inductance, and the output of three-phase filter inductance is connected with three-phase six switching inverters, three phase rectifier filter circuit respectively.
Three-phase six switching inverters of parallel connection type active electric filter of the present invention are comprised of compensation side three pole reactor, three-phase bridge inverter and electric capacity, the input that wherein compensates the side three pole reactor is connected with the output of three-phase filter inductance, the output of compensation side three pole reactor is connected with the input of three-phase bridge inverter, and two buses of three-phase bridge inverter are connected with the two ends of electric capacity respectively.
Beneficial effect:
The present invention is at ac input end access three-phase filter inductance, the three-phase filter inductance other end links to each other with inverter AC three pole reactor respectively and is connected in simultaneously load circuit, can reduce the size of compensation side three pole reactor and improve filter current tracking ability, and can better administer harmonic pollution in electric power net and improve power supply quality.
Description of drawings
Fig. 1 is conventional parallel connection type active current filter schematic diagram;
Fig. 2 is the equivalent electric circuit of conventional parallel active filter;
Fig. 3 is for compensating the equivalent electric circuit of the conventional parallel active filter after the side inductance splits;
Fig. 4 is the equivalent electric circuit that only changes the parallel active filter of other circuit equivalents of compensation branch road;
Fig. 5 is the equivalent electric circuit of parallel active filter of the present invention;
Fig. 6 is parallel connection type active current filter schematic diagram of the present invention;
Fig. 7 is the load current simulation waveform of conventional active current filter in parallel;
Fig. 8 is the current on line side simulation waveform of conventional parallel connection type active current filter;
Fig. 9 is the current on line side simulation waveform of parallel connection type active current filter of the present invention;
Figure 10 is A phase line voltage, power network current and the offset current waveform that the present invention is applied to a 400Hz electrical network.
Designation among the figure:
10-input filter inductance;
20-three-phase six switching inverters;
30-parallel connection type active electric filter branch road of the present invention;
21-compensation side three pole reactor;
22-three-phase bridge inverter;
23-electric capacity;
U S-line voltage;
u Sa, u Sb, u Sc-electrical network ABC three-phase voltage;
I S-current on line side;
I Sa-A phase electrical network output current;
I L-load current;
I C,-offset current;
I Ca-A phase offset current;
Q 1To Q 6-be respectively the first power switch pipe to the six power switch pipes;
D 1To D 6-be respectively the first diode to the six diodes;
L Sa, L Sb, L Sc-be respectively net side or load front-end A, B, C three-phase filter inductance;
L S-net side (or load front end) filter inductance;
L Ca, L Cb, L Cc-be respectively inverter to export A, B, C three-phase filter inductance;
L C, L C1, L C2-be respectively inverter output inductor and two to split inductance;
Figure G2009101833651D00031
X S,
Figure G2009101833651D00032
-be respectively inductance L C1Harmonic impedance, inductance L SImpedance of fundamental frequency and harmonic impedance;
C-inverter direct-flow side electric capacity;
L f-rectifying and wave-filtering inductance;
C f-rectifying and wave-filtering electric capacity;
The R-load resistance;
The PWM-inverter A mutually PWM of lower pipe Q2 drives signal.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
As shown in Figure 1, be conventional parallel connection type active current filter schematic diagram, control rectifying circuit brings larger di/dt in order to suppress not, adds three-phase filter inductance 40 at the AC of control rectifying circuit not, the electric current that flows through this inductance comprises fundamental current and harmonic current, and inductor loss is larger.The present invention integrates the three-phase filter inductance 40 of conventional shunt active power filter and compensation side three pole reactor 50, consists of parallel connection type active electric filter of the present invention.
As shown in Figure 2, the desirable equivalent electric circuit of conventional shunt active power filter.Load equivalent is for containing fundamental current i SAnd harmonic current
Figure G2009101833651D00041
Current source I L, the offset current equivalence is for only containing harmonic current
Figure G2009101833651D00042
Current source, power supply U sOnly provide fundamental current i to load S
As shown in Figure 3, compensation side three pole reactor L CMay be split into L C1And L C2Two inductance, then B point and the C current potential of ordering is respectively:
U · B = U · s - I · S X S - I ~ C X ~ S ,
U · C = U · s + I ~ C X ~ C ;
Wherein
Figure G2009101833651D00045
Load harmonic current,
Figure G2009101833651D00046
Be three-phase filter inductance L SHarmonic impedance,
Figure G2009101833651D00047
Be inductance L C1Harmonic impedance.
If harmonic impedance
Figure G2009101833651D00048
With Equate, can be by increasing harmonic voltage source at the harmonic compensation branch road
Figure G2009101833651D000410
With the fundamental voltage source So that B point and C point current potential are equal as shown in Figure 4, that is:
U · C = U · s + I ~ C X ~ C - I · S X S - 2 I ~ C X ~ C ,
Wherein U ~ C = - 2 I ~ C X ~ C , U · e = - I · S X S ;
Because the compensation branch road is current source, does not change the state of load-side and grid side by above-mentioned conversion, unique change be the both end voltage of compensating current element, and compensating current element is a controlled source, can be by the control break both end voltage.Thereby change the B point by above-mentioned equivalence and can directly link to each other because of equipotential with the C point, according to external circuit equivalence principle, offset current
Figure G2009101833651D000415
Directly move into the injection of B point in Fig. 4 square frame, the circuit in Fig. 4 square frame can equivalence be an inductance L S
As shown in Figure 5, Fig. 5 is the equivalent electric circuit of parallel connection type active current filter of the present invention.As seen, parallel connection type active current filter of the present invention has been compared following advantage with conventional parallel connection type active current filter:
1), the reducing of compensation side three pole reactor, filter current tracking ability is strengthened; The equivalent inductance value of compensation side three pole reactor increases, and the current ripples of net side is reduced; Therefore the present invention has better compensation effect.
2), the three-phase filter inductance is in load-side in the conventional topology, all load currents all flow through this inductance, and loss is larger; The three-phase filter inductance only flows through fundamental current component in the net side among the present invention, and loss reduces.
As shown in Figure 6, shunt active power filter circuit topological structure of the present invention is comprised of three-phase filter inductance 10, three-phase six switching inverters 20 and three phase rectifier filter circuit.Wherein: three-phase filter inductance 10 comprises A phase filter inductance L Sa, B phase filter inductance L Sb, C phase filter inductance L Sc, three-phase six switch inversions 20 comprise the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3, the 4th switching tube Q4, the 5th switching tube Q5, the 6th switching tube Q6, dc bus capacitor C, inverter AC A phase output inductor L Ca, inverter AC B phase output inductor L Cb, inverter AC C phase output inductor L CcThe three phase rectifier filter circuit is that three-phase diode is not controlled rectification+LC filter circuit.
A phase filter inductance L wherein SaAn end and A phase input voltage u SaConnect A phase filter inductance L SaThe other end respectively with inverter A phase output inductor L CaAn end, rectified load A phase input be connected B phase filter inductance L SbAn end be connected in B phase input voltage u Sb, B phase filter inductance L SbThe other end and inverter B phase output inductor L CbAn end link to each other and be connected in simultaneously rectified load B phase input, C phase filter inductance L ScAn end be connected in C phase input voltage u Sc, C phase filter inductance L ScThe other end and inverter C phase output inductor L CcAn end link to each other and be connected in simultaneously rectified load C phase input, inverter AC A phase output inductor L CaThe other end link to each other with the emitter of the first switching tube Q1 and be connected in simultaneously the collector electrode of second switch pipe Q2, inverter AC B phase output inductor L CbThe other end link to each other with the emitter of the 3rd switching tube Q3 and be connected in simultaneously the collector electrode of the 4th switching tube Q4, inverter C phase output inductor L CcThe other end link to each other with the emitter of the 5th switching tube Q1 and be connected in simultaneously the collector electrode of the 6th switching tube Q6, the collector electrode of the first switching tube Q1 links to each other with the collector electrode of the 3rd switching tube Q3 and is connected in simultaneously the collector electrode of the 5th switching tube Q5 and the anode of dc bus capacitor C, and the emitter of second switch pipe Q2 links to each other with the emitter of the 4th switching tube Q4 and is connected in simultaneously the emitter of the 6th switching tube Q6 and the negative terminal of dc bus capacitor C.
The present invention includes AC three-phase filter inductance, three-phase six switching inverters, three-phase and do not control rectification+LC filter circuit.Control system adopts the controller take DSP as core, electrical network three-phase voltage, load current and offset current and dc voltage signal are delivered to modulate circuit through voltage or current sensor sampling, signal input dsp controller after the processing, then dsp controller carries out computing to the signal that sampling obtains, produce pwm signal, through turning on and off of isolated drive circuit power ratio control pipe, thereby realize harmonic compensation.
The below carries out modeling and simulation to the Active Power Filter-APF of conventional Active Power Filter-APF and this paper invention under the MATLAB software environment.
Fig. 7 is the load current simulation waveform of conventional Shunt.Contain fundamental current and harmonic current in the load current, contain simultaneously this two current components in the three-phase filter inductance 40.
Fig. 8 is the current on line side simulation waveform of conventional Shunt.At this moment, compensation side three pole reactor is 0.15mH.Current on line side THD%=6.78% after the compensation.
Fig. 9 is the current on line side simulation waveform of the parallel connection type active electric filter invented of this paper.This moment, other parameter of circuit was the same with conventional topology, only compensated the side three pole reactor and was reduced to 0.05mH, the electric current THD%=4.37% after the compensation.As seen, compensation side three pole reactor size is minimized, the current tracking ability strengthens, and compensation performance is improved greatly.And the electric current that flows through three-phase filter inductance 10 only contains fundamental current basically.
Simulation comparison can draw, and the circuit topology of this paper invention has good harmonic suppression effect, compensates simultaneously that side three pole reactor size is reduced, the current tracking ability strengthens.
Figure 10 is the experimental waveform of the present invention's A phase line voltage, power network current and offset current when being applied to a 400Hz electrical network, and current on line side THD reaches 4.6%.
Draw from emulation and experimental result: the parallel connection type active electric filter of this paper invention can be realized power network harmonic wave management preferably, compensates simultaneously that side three pole reactor size is minimized, the current tracking ability strengthens.

Claims (2)

1. a parallel connection type active electric filter is characterized in that: comprise three-phase filter inductance (10), three-phase six switching inverters (20) and three phase rectifier filter circuit; The external electrical network three-phase voltage inputs to the input of three-phase filter inductance (10), and the output of three-phase filter inductance (10) is connected with three-phase six switching inverters (20), three phase rectifier filter circuit respectively.
2. parallel connection type active electric filter according to claim 1, it is characterized in that: three-phase six switching inverters (20) are by compensation side three pole reactor (21), three-phase bridge inverter (22) and electric capacity (23) form, the input that wherein compensates side three pole reactor (21) is connected with the output of three-phase filter inductance (10), the output of compensation side three pole reactor (21) is connected with the input of three-phase bridge inverter (22), and two buses of three-phase bridge inverter (22) are connected with the two ends of electric capacity (23) respectively.
CN2009101833651A 2009-09-18 2009-09-18 Parallel-connection type active power filter Expired - Fee Related CN101651347B (en)

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CN101917007B (en) * 2010-08-24 2013-03-27 济南大学 Method for determining inductance value at alternating side of shunt active power filter
EP2609663A4 (en) * 2010-08-24 2017-02-15 Merus Power Dynamics Oy Device and method for filtering in electrical power networks
CN103296907B (en) * 2012-03-02 2015-05-06 台达电子企业管理（上海）有限公司 Multilevel inverter and active power filter system
CN102983571A (en) * 2012-12-03 2013-03-20 江苏嘉钰新能源技术有限公司 Harmonic transfer type three-phase harmonic elimination circuit
CN103490416A (en) * 2013-09-12 2014-01-01 国家电网公司 Fundamental voltage sharing type medium-voltage active power filter
CN104467387A (en) * 2014-12-01 2015-03-25 沈阳工业大学 Active filter restraining common-mode voltage of frequency converter
CN107623450B (en) * 2017-05-22 2020-09-08 北方工业大学 Double-frequency single-phase PWM rectifier
CN108736751B (en) * 2018-07-23 2020-11-13 北方工业大学 Control method of double-frequency parallel three-phase grid-connected inverter

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Inventor after: Hu Haibing

Inventor after: Shi Wei

Inventor after: Huang Xiaobo

Inventor after: Xing Yan

Inventor before: Hu Haibing

Inventor before: Shi Wei

Inventor before: Xing Yan

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