CN103368375A - Common-mode voltage eliminating method for inverters in parallel connection - Google Patents
Common-mode voltage eliminating method for inverters in parallel connection Download PDFInfo
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- CN103368375A CN103368375A CN 201210099134 CN201210099134A CN103368375A CN 103368375 A CN103368375 A CN 103368375A CN 201210099134 CN201210099134 CN 201210099134 CN 201210099134 A CN201210099134 A CN 201210099134A CN 103368375 A CN103368375 A CN 103368375A
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- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000011161 development Methods 0.000 description 1
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Abstract
The invention provides a method for eliminating common-mode voltage. One of the inverters in parallel connection is selected as a host inverter, and other inverters are used as slave inverters.
Description
Technical field
When the invention relates to inverter parallel, how to eliminate common-mode voltage to the method for the impact of system.
Background technology
Three-phase PWM (pulse width modulation) inverter is the common a kind of topological structure of field of power electronics.Although modulating wave is the voltage waveform of the three-phase symmetrical of standard, because the restriction of power device switching frequency, in fact the three-phase voltage waveform that modulation obtains is not complete equipilibrium.Have a residual voltage between the three-phase modulations voltage wave, its size is the three-phase voltage sum, is called common-mode voltage.Common-mode voltage is applied between neutral point O and the ground, and main frequency range is positioned near the switching frequency.Common-mode voltage is the main cause that device interior produces electromagnetic compatibility (EMC) problem.The impact of eliminating common-mode voltage mainly contains two kinds of methods: a kind of is amplitude-frequency characteristic according to common-mode voltage, takes cut-off frequency less than the low pass filter of switching frequency; Another kind method is to detect common-mode voltage, artificially produces a common-mode voltage waveform, and its size is identical with the common-mode voltage of inverter output, and single spin-echo is to offset the impact of common-mode voltage.
At present, power electronic equipment power is just towards large scale development.Yet, because the restriction of device for power switching capacity in order to obtain very large equipment capacity, often needs many inverters are carried out parallel connection, as shown in Figure 1.After the parallel connection, the common-mode voltage of neutral point is the common-mode voltage sum of inverter, and the EMC performance of system has been proposed larger challenge.The present invention is directed to the characteristics of parallel system, proposed a kind of carrier signal phase shift strategy based on feedback, the method for the impact of common-mode voltage when being used for eliminating inverter parallel.
Summary of the invention
For above purpose, the present invention proposes a kind of method of eliminating common-mode voltage.Select one as main frame from shunt chopper, other are as slave, and concrete grammar is described below:
(1) utilizes voltage between resistance measurement neutral point and the ground;
(2) with the hardware plate of this signal leading to slave, this signal is carried out rectification process, obtain the mean value of signal;
(3) with this mean value as feedback signal, take zero as reference signal, the phase place of carrier wave or the phase place that drives signal consist of a closed-loop control system as controlled quentity controlled variable.Design suitable controller so that system stability.Because the frequency of common-mode voltage is very high, this control system needs all to adopt hardware to realize;
(4) in order to guarantee control performance, need to carry out amplitude limit to the phase deviation of slave carrier wave or driving signal;
(5) in the situation of many inverter parallels, after wherein a slave reaches the amplitude limit of phase place, can utilize other slave to continue this common-mode voltage of compensation;
(6) by the online adjuster of phase place amplitude limit on the main frame, adjust the amplitude limit value of reponse system on the slave, avoid the situation of phase deviation maldistribution between each slave;
(7) when control system is stable, the voltage between expression neutral point and the ground has been zero, thereby has eliminated the impact of common-mode voltage.
Good effect of the present invention is as follows:
(a) utilize inverter itself rather than EMC filter to eliminate the impact of common-mode voltage, weakened interference source from the source, reduced the cost of EMC design;
(b) realize simply only needing the carrier signal of slave is carried out the impact that phase shift just can be eliminated common-mode voltage.
Description of drawings
In claims of present patent application, pointed out particularly theme of the present invention, and clearly it has been proposed patent protection.Yet with reference to following detailed description and accompanying drawing, the related structure that can better understand the present invention and implementation method with and purpose, Characteristics and advantages.
Fig. 1 is the topological structure of inverter parallel, two inverter neutral points altogether, Z is the resistance of measuring common-mode voltage.
Fig. 2 is in the inverter parallel situation, eliminates the feedback control principle figure of common-mode voltage.
The above only is preferred technical scheme of the present invention, for those skilled in the art, without departing from the inventive concept of the premise, can also make some improvements and modifications, and these improve with retouching and also can be considered as within protection scope of the present invention.
Claims (4)
1. the common-mode voltage removing method of a shunt chopper, method comprises following part:
--the neutral point of shunt chopper is by single-point grounding;
--the ohmically voltage of earth point is as feedback signal, and slave driving signal is controlled quentity controlled variable with respect to the phase shift of main frame, by the common-mode voltage between the FEEDBACK CONTROL elimination inverter;
---the scheduler module of on the main frame phase place amplitude limit of slave being distributed.
2. a kind of common-mode voltage removing method of shunt chopper as claimed in claim 1 is characterized in that: by the feedback signal of common-mode voltage on the resistance of earth point, adjust slave and drive the phase place of signal to eliminate common-mode voltage.
3. such as the common-mode voltage removing method of a kind of shunt chopper as described in claim 1 and 2, it is characterized in that: the reponse system on the slave adopts hardware designs.
4. a kind of common-mode voltage removing method of shunt chopper as claimed in claim 1 is characterized in that: designed phase slicing algorithm on main frame, the amplitude limit that slave is driven the phase place of signal is adjusted and is distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210099134 CN103368375A (en) | 2012-04-06 | 2012-04-06 | Common-mode voltage eliminating method for inverters in parallel connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210099134 CN103368375A (en) | 2012-04-06 | 2012-04-06 | Common-mode voltage eliminating method for inverters in parallel connection |
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| Publication Number | Publication Date |
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| CN103368375A true CN103368375A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201210099134 Pending CN103368375A (en) | 2012-04-06 | 2012-04-06 | Common-mode voltage eliminating method for inverters in parallel connection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052320A (en) * | 2014-06-17 | 2014-09-17 | 华为技术有限公司 | PWM method and device |
| CN104538987A (en) * | 2014-12-31 | 2015-04-22 | 阳光电源股份有限公司 | Control method and system for parallel connection of alternating current sides of photovoltaic inverters |
| CN105656338B (en) * | 2014-11-14 | 2018-08-14 | 比亚迪股份有限公司 | The common-mode voltage suppressing method and inverter system of multiple inverters |
-
2012
- 2012-04-06 CN CN 201210099134 patent/CN103368375A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052320A (en) * | 2014-06-17 | 2014-09-17 | 华为技术有限公司 | PWM method and device |
| CN104052320B (en) * | 2014-06-17 | 2017-02-22 | 华为技术有限公司 | PWM method and device |
| CN105656338B (en) * | 2014-11-14 | 2018-08-14 | 比亚迪股份有限公司 | The common-mode voltage suppressing method and inverter system of multiple inverters |
| CN104538987A (en) * | 2014-12-31 | 2015-04-22 | 阳光电源股份有限公司 | Control method and system for parallel connection of alternating current sides of photovoltaic inverters |
| CN104538987B (en) * | 2014-12-31 | 2017-01-11 | 阳光电源股份有限公司 | Control method and system for parallel connection of alternating current sides of photovoltaic inverters |
| US10027125B2 (en) | 2014-12-31 | 2018-07-17 | Sungrow Power Supply Co., Ltd. | Control method and system for photovoltaic inverters whose AC sides are connected in parallel |
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Application publication date: 20131023 |