Hybrid control method to suppress neutral-point voltage fluctuation for three-phase three-level VIENNA rectifier

Song Weizhang; Dai Zhihao; Sun Xiangdong; Yan Hua; Wu Fengjun; Gao Daqing; Wang Youyun

doi:10.11884/HPLPB201931.180386

Volume 31 Issue 4

Apr. 2019

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Article Navigation > High Power Laser and Particle Beams > 2019 > 31(4): 040016

Song Weizhang, Dai Zhihao, Sun Xiangdong, et al. Hybrid control method to suppress neutral-point voltage fluctuation for three-phase three-level VIENNA rectifier[J]. High Power Laser and Particle Beams, 2019, 31: 040016. doi: 10.11884/HPLPB201931.180386

Citation:

Song Weizhang, Dai Zhihao, Sun Xiangdong, et al. Hybrid control method to suppress neutral-point voltage fluctuation for three-phase three-level VIENNA rectifier[J]. High Power Laser and Particle Beams, 2019, 31: 040016. doi: 10.11884/HPLPB201931.180386

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Hybrid control method to suppress neutral-point voltage fluctuation for three-phase three-level VIENNA rectifier

doi: 10.11884/HPLPB201931.180386

1.
School of Automation and Information Engineering, Xi'an University of Technology, Xi'an 710048, China
2.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
3.
State Key Laboratory of Large Electric Drive System and Equipment, Tianshui 741000, China

Received Date: 2018-12-29
Rev Recd Date: 2019-03-12
Publish Date: 2019-04-15

Abstract

Abstract

Aiming at the problem of the third fundamental frequency fluctuation of the midpoint potential of VIENNA rectifier, the mathematical model of the midpoint current is established. The midpoint fluctuation form is analyzed, and the mathematical reason of midpoint fluctuation is pointed out by analysing the midpoint current mathematical model. To overcome the limitation of the traditional fixed adjustment factor control method to suppress neutral-point voltage fluctuation, a hybrid suppression method combining dynamic adjustment factor and capacitance deviation adjustment is proposed. This method realizes the automatic suppression of the midpoint potential fluctuation through looking for the tables for the deviation adjustment and the dynamic adjustment factor expression within the six sectors which is injected into the three-phase modulation waves, and further modified hybrid suppression method can effectively suppress the large fluctuation hybrid of the midpoint caused by asymmetry of the capacitance parameter and the unbalanced load. The experimental results verify the feasibility and validity of the strategy.
- three phase three level VIENNA rectifier,
- neutral-point voltage fluctuation,
- hybrid control method,
- dynamic adjustment factor

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References(11)

References

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