CN1905339A - Compensating method for active power filter inverter harmonic domain dead zone effect - Google Patents
Compensating method for active power filter inverter harmonic domain dead zone effect Download PDFInfo
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- CN1905339A CN1905339A CNA200610032033XA CN200610032033A CN1905339A CN 1905339 A CN1905339 A CN 1905339A CN A200610032033X A CNA200610032033X A CN A200610032033XA CN 200610032033 A CN200610032033 A CN 200610032033A CN 1905339 A CN1905339 A CN 1905339A
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- Y02E40/20—Active power filtering [APF]
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Abstract
The invention discloses an active power filter inverter harmonic domain dead zone effect compensating method, comprising the steps of: detecting harmonic current in compensated object, adopting improved regular sampling method to make PWM modulation, and obtaining pulse width data of PWM control signal; detecting inverter inputted harmonic current, advancing ON time of power switch tube corresponding to the inverter by a dead zone time according to the inverter outputted harmonic current for making corresponding compensation. And it can obtain desired output pulse signal at the output end, effectively reducing main harmonic components in the output harmonic current, and thus making amplitude and phase of the output harmonic current more approach to desired condition.
Description
Technical field
Patent of the present invention relates to a kind of compensation method of active power filter inverter harmonic domain dead zone effect.
Background technology
Along with modern industry development, electric load becomes increasingly complex, the capacity that has formed Harmonious Waves in Power Systems is big, the time characteristics that become.Traditional LC passive filter more and more can not satisfy the requirement of modern industry application and electric power system, along with the appearance of Active Power Filter-APF (APF), for power network harmonic wave management provides a kind of important mode.Active Power Filter-APF is offset the harmonic current that load produces by inject certain offset current to electrical network, its application has overcome some shortcomings of traditional harmonic suppressing method such as LC filter, but it is the high order harmonic component of compensating non-linear load generation both, can adapt to the quick variation of electric network impedance and frequency automatically again, and have high controllability and fast-response.
Ideally, the IGBT of single brachium pontis of inverter turn-on and turn-off complementally always.It is longer than ON time that but IGBT exists certain turn-on and turn-off time, especially turn-off time, if in the process that IGBT turn-offs, another IGBT conducting immediately on the same brachium pontis then must make DC bus-bar voltage straight-through, damages IGBT.Therefore, in actual applications, the turn-on and turn-off of the IGBT up and down of same brachium pontis are staggered the regular hour, i.e. Dead Time T
d, always close afterwards earlier with the IGBT up and down that guarantees same brachium pontis and to lead to.The mode of injection Dead Time has multiple, as modes such as symmetric mode, hybrid mode, turn on delay or shutoffs in advance.Generally speaking, time-delay conducting injection dead band mode is used comparatively extensive, is about to IGBT time-delay T
dTime is conducting again.
The existence of Dead Time will cause output current waveform distortion, output voltage all can produce tangible deviation with expectation voltage, not only fundamental voltage output of voltage is exerted an influence, and can produce new additional harmonic wave, the first-harmonic frequency domain exist 6i ± 1 (i=1,2 ...) subharmonic.Carrier wave ratio N is high more, Dead Time T
dBig more, distortion is just severe more, even can cause system oscillation.And the existence of Dead Time makes the offset current of output produce deviation on amplitude and phase place, causes filtering performance to descend, and has seriously influenced the service behaviour of Active Power Filter-APF.Therefore, must carry out corresponding compensation to the harmonic domain dead zone time.
Summary of the invention
For the existence that solves Dead Time causes the technical problem of output current waveform distortion, the invention provides a kind of compensation method of Active Power Filter-APF active power filter inverter harmonic domain dead zone effect.This compensation method has reduced the main harmonic components that exists in the output harmonic wave electric current effectively, makes output harmonic wave current amplitude and phase place more near ideal state.
The technical scheme that the present invention solves the problems of the technologies described above may further comprise the steps:
The harmonic current that exists in the sampling target compensation utilizes the triangular modulation method to carry out the PWM modulation, and the positive and negative pulse-width data that obtains pwm control signal is respectively t
1, t
2
Detect the direction of inverter output harmonic wave current i, when output harmonic wave current i＞0, brachium pontis IGBT opens and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces on single-phase inverter; When output harmonic wave current i＜0, brachium pontis IGBT opens and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces under single-phase inverter.
Beneficial effect of the present invention: the present invention opens at single-phase inverter brachium pontis IGBT according to the direction of harmonic current and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces, make the offset current of output diminish in the amplitude and the phase place upper deviation, more near ideal state, reduced the main harmonic components that exists in the output harmonic wave electric current effectively, eliminate dead time effect to the negative influence that output produces, improved the filtering performance of Active Power Filter-APF.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is inverter PWM modulation principle figure.
Fig. 2 is the compensation principle figure of i＞0 harmonic domain dead zone effect.
Fig. 3 is the compensation principle figure of i＜0 harmonic domain dead zone effect.
Embodiment
Referring to Fig. 1, Fig. 1 is inverter PWM modulation principle figure.Adopt the improvement regular sampling to carry out the PWM modulation, if triangle wave period be T, at adjacent two triangular wave negative peaks moment ti and ti+T the modulation signal sampling is obtained C point and D point, cross that C point and D point are made a straight line and triangular wave meets at A point and B point respectively, the break-make of the moment t2 power controlling switching device of ordering at moment t1 that A is ordered and B.The sampling instant ti in each cycle, the period T of triangular wave and amplitude K determine, establishes the value that modulation signal orders at C point and D and be respectively S1 and S2, and then the equation of line segment CD is
(t-ti)/(s-s1)＝T/(s2-s1) (1)
The equation of triangular wave two waists is respectively
(t-ti)/(s+k)＝T/4k (2)
(t-ti-T)/(s+k)＝-T/4k (3)
Difference simultaneous equations (1), (2) and (1), (3) can solve A point moment t1 and B point moment t2 is respectively
t1＝T(k+s1)/(4k+s1-s2)+ti (4)
t2＝T(3k-s1)/(4k+s2-s1)+ti (5)
Like this, under the situation of ideal output, the positive and negative pulse-width data of the pwm control signal that obtains should be respectively t1 and t2.
Obviously, when carrying out the PWM modulation, not only need constantly sample, equally also need constantly sample at the triangular wave positive peak to the output harmonic wave current i at triangular wave positive peak and negative peak to modulation signal, thereby to judge the pulse-width data of positive and negative definite reality.
Fig. 2 is the compensation principle figure of i＞0 time-harmonic wave domain dead zone effect.When current i＞0, electric current flow through on the single-phase inverter brachium pontis IGBT or the fly-wheel diode of brachium pontis IGBT down, following brachium pontis IGBT not conducting all the time, therefore the pulse signal of brachium pontis can be ignored down, only needs to guarantee the pulse duration and desirable consistent the getting final product of pulse duration of the last brachium pontis IGBT after compensation.(a) is the impulse waveform of desirable output among Fig. 2, and the real pulse shape when being uncompensated (b) (c) is the reference pulse waveform that adds compensation, (d) is the actual output pulse waveform behind the dead area compensation.Become the Dead Time T that will lag behind of positive time through dead time effect actual pulse output
dIn order to compensate this error, brachium pontis IGBT opens and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces on single-phase inverter, like this, just can obtain the output pulse signal identical with the ideal pulse signal at output behind dead area compensation, promptly (d) is equivalent to (a).
Fig. 3 is the compensation principle figure of i＜0 time-harmonic wave domain dead zone effect.When current i＜0, flow through brachium pontis IGBT under the single-phase inverter or go up the fly-wheel diode of brachium pontis IGBT of electric current, last brachium pontis IGBT not conducting all the time, therefore the pulse signal of going up brachium pontis can be ignored, as long as guarantee that the pulse duration of the following brachium pontis IGBT after compensation is consistent with desirable pulse duration.(a) is the impulse waveform of desirable output among Fig. 3, and the real pulse shape when being uncompensated (b) (c) is the reference pulse waveform that adds compensation, (d) is the actual output pulse waveform behind the dead area compensation.Become the Dead Time T that will lag behind of negative time by dead time effect actual pulse output
dIn order to compensate this error, brachium pontis IGBT opens and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces under single-phase inverter, like this, just can obtain the output pulse signal identical with the ideal pulse signal at output behind dead area compensation, promptly (d) is equivalent to (a).
Claims (2)
1, a kind of compensation method of active power filter inverter harmonic domain dead zone effect may further comprise the steps:
The sampling harmonic current in compensated object utilizes the triangular modulation method to carry out the PWM modulation, and the positive and negative pulse-width data that obtains pwm control signal is respectively t
1, t
2
Detect the direction of inverter output harmonic wave current i, when output harmonic wave current i＞0, brachium pontis IGBT opens and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces on single-phase inverter; When output harmonic wave current i＜0, brachium pontis IGBT opens and gives the ideal pulse signal additional one and the equal compensated pulse amount of error pulse width before the dead band produces under single-phase inverter.
2, according to the compensation method of the described active power filter inverter harmonic domain dead zone effect of claim 1, described triangular modulation method is for improving regular sampling.
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| CNB200610032033XA CN100466431C (en) | 2006-07-31 | 2006-07-31 | Compensating method for active power filter inverter harmonic domain dead zone effect |
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| CNB200610032033XA CN100466431C (en) | 2006-07-31 | 2006-07-31 | Compensating method for active power filter inverter harmonic domain dead zone effect |
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| CN1905339A true CN1905339A (en) | 2007-01-31 |
| CN100466431C CN100466431C (en) | 2009-03-04 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304172B (en) * | 2008-03-26 | 2010-06-23 | 湖南大学 | Method for real time pre-compensating harmonic wave field dead region |
| CN101917158A (en) * | 2010-06-09 | 2010-12-15 | 中国科学院电工研究所 | Dead-zone compensation method for voltage source inverter |
| CN101944838A (en) * | 2010-07-29 | 2011-01-12 | 浙江大学 | Current state judging and dead zone compensating method based on IGBT (Insulated Gate Bipolar Translator) drive chip short-circuit protection |
| CN102986128A (en) * | 2010-08-25 | 2013-03-20 | 富士电机株式会社 | Power converter |
| CN105119550A (en) * | 2015-09-24 | 2015-12-02 | 杨浩东 | Simple multiphase SVPWM modulation method realized by utilization of CPLD |
| CN106972514A (en) * | 2017-05-26 | 2017-07-21 | 云南电网有限责任公司电力科学研究院 | Three-phase and four-line imbalance abatement equipment dead-zone compensation method, apparatus and system |
| CN107834878A (en) * | 2017-11-30 | 2018-03-23 | 郑州云海信息技术有限公司 | A kind of Inverter Dead-time effect compensation method |
| CN110545033A (en) * | 2018-05-28 | 2019-12-06 | 株洲中车时代电气股份有限公司 | method and system for compensating dead zone in inverter |
| CN112511026A (en) * | 2020-11-05 | 2021-03-16 | 苏州海鹏科技有限公司 | H-bridge inverter system and dead zone compensation device thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0179872B1 (en) * | 1996-03-26 | 1999-05-15 | 이종수 | A dead time compensating method of an inverter for a motor drive |
-
2006
- 2006-07-31 CN CNB200610032033XA patent/CN100466431C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304172B (en) * | 2008-03-26 | 2010-06-23 | 湖南大学 | Method for real time pre-compensating harmonic wave field dead region |
| CN101917158A (en) * | 2010-06-09 | 2010-12-15 | 中国科学院电工研究所 | Dead-zone compensation method for voltage source inverter |
| CN101917158B (en) * | 2010-06-09 | 2012-10-24 | 中国科学院电工研究所 | Dead-zone compensation method for voltage source inverter |
| CN101944838A (en) * | 2010-07-29 | 2011-01-12 | 浙江大学 | Current state judging and dead zone compensating method based on IGBT (Insulated Gate Bipolar Translator) drive chip short-circuit protection |
| CN101944838B (en) * | 2010-07-29 | 2012-12-26 | 浙江大学 | Current state judging and dead zone compensating method based on IGBT (Insulated Gate Bipolar Translator) drive chip short-circuit protection |
| US9071166B2 (en) | 2010-08-25 | 2015-06-30 | Fuji Electric Co., Ltd. | Power converter with surge voltage suppression |
| CN102986128A (en) * | 2010-08-25 | 2013-03-20 | 富士电机株式会社 | Power converter |
| CN102986128B (en) * | 2010-08-25 | 2016-05-04 | 富士电机株式会社 | Power converter |
| CN105119550A (en) * | 2015-09-24 | 2015-12-02 | 杨浩东 | Simple multiphase SVPWM modulation method realized by utilization of CPLD |
| CN106972514A (en) * | 2017-05-26 | 2017-07-21 | 云南电网有限责任公司电力科学研究院 | Three-phase and four-line imbalance abatement equipment dead-zone compensation method, apparatus and system |
| CN106972514B (en) * | 2017-05-26 | 2019-11-01 | 云南电网有限责任公司电力科学研究院 | Three-phase and four-line imbalance abatement equipment dead-zone compensation method, apparatus and system |
| CN107834878A (en) * | 2017-11-30 | 2018-03-23 | 郑州云海信息技术有限公司 | A kind of Inverter Dead-time effect compensation method |
| CN110545033A (en) * | 2018-05-28 | 2019-12-06 | 株洲中车时代电气股份有限公司 | method and system for compensating dead zone in inverter |
| CN112511026A (en) * | 2020-11-05 | 2021-03-16 | 苏州海鹏科技有限公司 | H-bridge inverter system and dead zone compensation device thereof |
| CN112511026B (en) * | 2020-11-05 | 2022-07-15 | 苏州海鹏科技有限公司 | H-bridge inverter system and dead zone compensation device thereof |
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