CN1665118A - Control method for three-phase four-arm converter - Google Patents

Control method for three-phase four-arm converter Download PDF

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Publication number
CN1665118A
CN1665118A CN2005100384500A CN200510038450A CN1665118A CN 1665118 A CN1665118 A CN 1665118A CN 2005100384500 A CN2005100384500 A CN 2005100384500A CN 200510038450 A CN200510038450 A CN 200510038450A CN 1665118 A CN1665118 A CN 1665118A
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China
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brachium pontis
phase
harmonic
control
converter
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CN100373759C (en
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张方华
王慧贞
陈新
龚春英
丁勇
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention relates to a method for controlling three-phase four-leg converter, belonging to the field of power electronics converter. The method is that: the idea of generating switch tube control pulses of the four legs is that: the front three of the four legs adopt SPWM control or harmonic filtering technique to eliminate the 6k+/-1th harmonics (wherein, k is a natural number 1, 2, 3, 4, and the like), the control pulse for the fourth leg eliminates the phase voltage zero-sequence harmonics generated by the front three ones, by the SPWM control or harmonic filtering technique, i.e. by the mutually or approximately counteraction of the 3kth harmonics generated by the fourth leg and the 3kth harmonics generated by the front three ones. The invention eliminates all the low-order harmonics to ensure the quality of the output waveforms of the converter, applied to the application occasions of medium-high frequency output. The method makes the converter possess the advantages of low switching frequency, small total harmonic distortion (THD) of output voltage, etc.

Description

The control method of three-phase four-arm converter
Technical field
The present invention relates to the controlling party converters owned by France of three-phase four-arm converter.
Background technology
Traditional control method of three-phase four-arm converter has following three kinds:
1. three-dimensional space vectors control technology
16 switch vectors that this technology utilizes the on off state of four brachium pontis to form dynamically synthesize the three-phase output vector, and its movement locus is similar on a magnetic linkage circle.The defective of this technology is the switching frequency height, is unsuitable for the application scenario of medium-high frequency output.
2. voltage and current double closed-loop control technology
This technology has realized the adjustment of output voltage with load state by the dynamic tracking to output current, guarantees the waveform quality of output voltage.The defective of this technology is the switching frequency height, is unsuitable for the application scenario of medium-high frequency output.
3. positive sequence, negative phase-sequence, Zero-pharse harmonic compensation technique
This technology is decomposed by the harmonic wave of output voltage, electric current, follows the tracks of respectively and eliminates output voltage degree of unbalance and the bigger low-order harmonic of total harmonic distortion (THD) influence, realizes the control to output voltage.The defective of this technology has: 1) control circuit complexity; 2) be unsuitable for the application scenario that medium-high frequency is exported.
Summary of the invention
The objective of the invention is to the defective that exists at above-mentioned prior art, develop a kind of can overcome have defective now, switching frequency is low, output voltage total harmonic distortion (THD), converter that the phase voltage degree of unbalance is little.
The three-phase four-arm converter of realization above-mentioned purpose is made up of the main circuit and the control circuit of three-phase four-leg inverter.To forming four brachium pontis, 3 brachium pontis mid points connect the low pass filter of inductance L, capacitor C composition to main circuit by four switching tube arms, and three the star-like connections of electric capacity backs link to each other with another brachium pontis mid point.The production method of control impuls is in the control circuit:
1) three of four-leg inverter brachium pontis adopt the harmonic wave technology for eliminating to eliminate 6k ± 1 subharmonic (wherein k is natural numbers such as 1,2,3,4).By the repeatedly commutation of switching device in the inverter, the pwm voltage waveform of control inverter makes brachium pontis mid-point voltage waveform decompose the fundamental voltage that obtains according to fourier series and satisfies certain amplitude requirement that low-order harmonic is as far as possible little.In order to reduce harmonic wave, generally make waveform symmetry.At first make the positive half cycle and the negative half period of waveform be symmetrical in zero point, promptly f (ω t)=-f (ω t+ π), can eliminate even-order harmonic.Its less important waveform odd symmetry that makes, i.e. f (ω t)=f (π-ω t), the cosine term in can harmonic carcellation.In 1/4 cycle, choose 2k independent switch angle, can obtain an on off sequence.According to this on off sequence switch, the output voltage Fu Shi that can obtain the brachium pontis mid point is decomposed into
U 0 = Σ n U n sin nωt ( n = 1 , 3 , 5 K ) - - - ( 1 )
The amplitude of supposing input voltage is E, and then the amplitude of nth harmonic is
U n = 4 E nπ [ 1 + 2 Σ i = 1 2 k ( - 1 ) ′ cos nθi ( 1,3,5 · · · ) - - - ( 2 )
Make that the humorous wave amplitude of this time is zero as long as eliminate certain subharmonic in the output voltage.For three-phase bridge type converter, under balanced load, there is not zero-sequence component in the output line voltage, therefore as long as eliminate 6k ± 1 subharmonic.Control signal between the three-phase differs 120 °.
2) the control impuls frequency of the 4th brachium pontis is three times of first three brachium pontis control impuls frequency, and its control impuls production method is also taked the harmonic wave technology for eliminating.By controlling the on off sequence of the 4th brachium pontis, make it produce the harmonic wave consistent with the Zero-pharse harmonic of first three brachium pontis mid-point voltage, the phase voltage Zero-pharse harmonic in first three brachium pontis mid-point voltage is eliminated in control.Promptly
U4 n＝U 3k (3)
U4 wherein nBe the 4th brachium pontis mid point harmonic voltage (harmonic number is with respect to 3 times of inverter output voltage frequencies), n is 1,3,5,7......; U 3kBe first three brachium pontis brachium pontis mid point harmonic voltage, k is 1,3,5,7.......
Promptly the superposed signal and the triangular wave of the Zero-pharse harmonic by different amplitudes relatively produce the 4th brachium pontis control signal to adopt SPWM control to produce the 4th brachium pontis control impuls;
Adopt the control of harmonic wave technology for eliminating to produce the 4th brachium pontis control impuls and promptly obtain on off sequence, make the low order Zero-pharse harmonic of the 4th brachium pontis mid-point voltage and the low order Zero-pharse harmonic that first three brachium pontis produces offset or approximate the counteracting by the compute switch position.
The present invention has guaranteed the output waveform quality of converter, the application scenario of high-power medium-high frequency output in being applicable to by eliminating or approximate all low-order harmonics of eliminating.
The control method of three-phase four-arm converter of the present invention, following advantage is arranged: 1) switching frequency is low, and the application scenario of high-power medium-high frequency output has been improved system reliability and conversion efficiency, has been alleviated system bulk weight in being applicable to; 2) Zero-pharse harmonic that produces of the low-order harmonic that brings of the 4th brachium pontis and other three brachium pontis offsets, and does not bring additional low-order harmonic, and the output voltage total harmonic distortion (THD) of system is little; 3) Zero-pharse harmonic that exists for of the 4th brachium pontis provides path, and the imbalance of phase voltage only causes because of the internal impedance of converter that the phase voltage degree of unbalance is little under the unbalanced load, is applicable to the application scenario of asymmetric load; 4) input direct voltage utilance height has reduced the burden of converter device voltage stress and relevant input equipment.
Description of drawings
Fig. 1. the main circuit of three-phase four-arm converter.Fig. 1 (a) is the three-phase four-arm converter of line impedence in not having, and Fig. 1 (b) is for having the three-phase four-arm converter of middle line impedence.
Embodiment
Control technology of the present invention is for to be applicable to that the switching point of Fig. 1 (a) and Fig. 1 (b) presets the particular harmonic technology for eliminating.
By six switching tube S 1, S 2, S 3, S 4, S 5, S 6The switching time of three brachium pontis forming is by calculating, calculate principle and be that first-harmonic meets the demands, the low-order harmonic of 6k ± 1 time (wherein k is natural numbers such as 1,2,3,4) satisfies certain optimization principles, the switching pulse of one-period satisfies odd symmetry and half-wave even symmetry.Switching tube S 5, S 6The switching time of the brachium pontis of forming lags behind switching tube S 3, S 4The switching time of the brachium pontis of forming; Switching tube S 3, S 4The switching time of the brachium pontis of forming lags behind switching tube S 1, S 2The switching time of the brachium pontis of forming.
By switching tube S 7, S 8The control method of the brachium pontis of forming can be taked SPWM control or harmonic wave technology for eliminating.
If output voltage frequency is f oAdopt the 4th brachium pontis switching pulse of SPWM control to hand over a section generation by carrier wave and modulating wave.Carrier wave is generally triangular wave; Modulating wave is that frequency is 3f oSine wave, perhaps modulating wave is by 3f o, 9f o, 15f oBe formed by stacking according to certain weight coefficient Deng Zero-pharse harmonic.The 4th brachium pontis switching pulse that adopts harmonic Elimination Method to control constantly can be by calculating, and calculating principle is by switching tube S 7, S 8Subharmonic such as 1,3,5,7 in the fourier decomposition of the brachium pontis mid-point voltage of the brachium pontis of forming respectively with other three brachium pontis in Zero-pharse harmonics such as 3,9,15,21 offset or approximate the counteracting.By S 7, S 8The switching time of the brachium pontis of forming, its cycle is 3 times of output voltage cycle, i.e. 3f o, the switching pulse of one-period satisfies odd symmetry and half-wave even symmetry.

Claims (2)

1, a kind of control method of three-phase four-arm converter, it is characterized in that, wherein three brachium pontis of four brachium pontis adopt SPWM control or harmonic wave technology for eliminating, the 4th brachium pontis control impuls takes SPWM control or harmonic wave technology for eliminating to eliminate the phase voltage Zero-pharse harmonic that first three brachium pontis produces, and promptly offsets or approximate the counteracting by the 4th brachium pontis 3k subharmonic that produces and the 3k subharmonic that first three brachium pontis produces.
According to the control method of the described three-phase four-arm converter of claim 1, it is characterized in that 2, the 4th brachium pontis mid-point voltage that the control impuls of the 4th brachium pontis produces has the relation with corresponding low-order harmonic counteracting of first three brachium pontis mid-point voltage or partial offset.
CNB2005100384500A 2005-03-16 2005-03-16 Control method for three-phase four-arm converter Expired - Fee Related CN100373759C (en)

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CN101510736B (en) * 2009-03-11 2010-12-08 南京航空航天大学 Method for restraining mid-point potential excursion of three-phase four-bridge arm tri-level inverter
CN101436832B (en) * 2008-12-23 2011-01-12 南京航空航天大学 Combined running method for three-phase inverter
CN101976850A (en) * 2010-10-11 2011-02-16 江西省电力科学研究院 Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter
CN101501982B (en) * 2006-08-30 2011-10-19 Thk株式会社 Power supply device for permanent magnet field type linear motor
CN102570889A (en) * 2011-01-04 2012-07-11 西华大学 Three-phase four-bridge arm inverter and control method
CN103023358A (en) * 2012-12-17 2013-04-03 中国科学院电工研究所 Method for calculating current reference value of three-phase four-wire grid-connected voltage source type pulse-width modulation (PWM) rectifier
CN104967332A (en) * 2015-06-30 2015-10-07 南车株洲电力机车研究所有限公司 Method and device for realizing multifunctional current transformer module
CN106301053A (en) * 2016-10-08 2017-01-04 国家电网公司 Three-phase four-leg inverter control method under the conditions of imbalance, nonlinear load
CN106452136A (en) * 2016-06-20 2017-02-22 清华大学 Multi-port power electronic converter for energy internet
CN106505903A (en) * 2016-12-05 2017-03-15 阳光电源股份有限公司 A kind of three-phase four-arm inversion system
CN106685252A (en) * 2017-03-02 2017-05-17 江苏大学 Three-phase and four-arm inverter control method and system based on virtual synchronizer
CN107039991A (en) * 2017-04-24 2017-08-11 北京交通大学 A kind of light storage off-network independent power supply device and method based on MMC topologys
CN108156832A (en) * 2015-07-09 2018-06-12 Abb瑞士股份有限公司 The control of electric transducer based on optimization pulse pattern

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SE508934C2 (en) * 1997-03-24 1998-11-16 Asea Brown Boveri Device for reducing zero-sequence currents when converting direct voltage to three-phase alternating voltage by pulse width modulation
CN2563830Y (en) * 2002-07-31 2003-07-30 张承志 Full bridge shape changing buffering SPWM wave DC/AC reverse circuit
KR100629824B1 (en) * 2003-03-31 2006-09-29 설승기 A Carrier-Based SVPWM Method for Three-Phase Four-Leg Inverter and a Switching Signal Generator

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101501982B (en) * 2006-08-30 2011-10-19 Thk株式会社 Power supply device for permanent magnet field type linear motor
CN101079582B (en) * 2007-07-05 2010-05-19 东北大学 Control method of reverse system
CN101436832B (en) * 2008-12-23 2011-01-12 南京航空航天大学 Combined running method for three-phase inverter
CN101510736B (en) * 2009-03-11 2010-12-08 南京航空航天大学 Method for restraining mid-point potential excursion of three-phase four-bridge arm tri-level inverter
CN101976850A (en) * 2010-10-11 2011-02-16 江西省电力科学研究院 Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter
CN101976850B (en) * 2010-10-11 2012-09-26 江西省电力科学研究院 Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter
CN102570889A (en) * 2011-01-04 2012-07-11 西华大学 Three-phase four-bridge arm inverter and control method
CN103023358A (en) * 2012-12-17 2013-04-03 中国科学院电工研究所 Method for calculating current reference value of three-phase four-wire grid-connected voltage source type pulse-width modulation (PWM) rectifier
CN104967332A (en) * 2015-06-30 2015-10-07 南车株洲电力机车研究所有限公司 Method and device for realizing multifunctional current transformer module
CN108156832A (en) * 2015-07-09 2018-06-12 Abb瑞士股份有限公司 The control of electric transducer based on optimization pulse pattern
CN108156832B (en) * 2015-07-09 2020-05-08 Abb瑞士股份有限公司 Control of electrical converters based on optimized pulse patterns
CN106452136A (en) * 2016-06-20 2017-02-22 清华大学 Multi-port power electronic converter for energy internet
CN106452136B (en) * 2016-06-20 2019-04-02 清华大学 A kind of multiport converters for energy internet
CN106301053A (en) * 2016-10-08 2017-01-04 国家电网公司 Three-phase four-leg inverter control method under the conditions of imbalance, nonlinear load
CN106505903A (en) * 2016-12-05 2017-03-15 阳光电源股份有限公司 A kind of three-phase four-arm inversion system
CN106505903B (en) * 2016-12-05 2019-04-09 阳光电源股份有限公司 A kind of three-phase four-arm inversion system
CN106685252A (en) * 2017-03-02 2017-05-17 江苏大学 Three-phase and four-arm inverter control method and system based on virtual synchronizer
CN107039991A (en) * 2017-04-24 2017-08-11 北京交通大学 A kind of light storage off-network independent power supply device and method based on MMC topologys

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