Control Strategy of Power Conversion System under Unbalanced Grid Voltage

doi:10.11930/j.issn.1004-9649.202110012

Electric Power ›› 2022, Vol. 55 ›› Issue (7): 93-101.DOI: 10.11930/j.issn.1004-9649.202110012

• Power System • Previous Articles Next Articles

Control Strategy of Power Conversion System under Unbalanced Grid Voltage

OU Mingyong^1,2, WANG Yichao^1,2, LIU Wenjun^1,2, XIA Xiangyang^2,3, CHEN Lingbin^2,3, LENG Yang^1,2, ZHENG Chuyu^1,2

1. Economical & Technical Research Institute of State Grid Hunan Electric Power Co., Ltd., Changsha 410004, China;
2. Hunan Engineering Research Center of Large-scale Battery Energy Storage Application Technology, Changsha 410004, China;
3. School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China

Received:2021-10-10 Revised:2022-04-20 Online:2022-07-28 Published:2022-07-20
Supported by:
This work is supported by Science and Technology Project of State Grid Hunan Electric Power Corporation Limited (Research on Key Technologies of Battery Safety Operation and Grid Connection Commissioning of Large-Scale Energy Storage Power Station, No.5216A220000X), and Science-Technology Innovation Platform and Talents Program of Hunan Province (No.2019TP1053).

Abstract

Abstract: Unbalanced grid voltage will cause voltage fluctuations on the DC side and active power fluctuations on the grid side, which seriously affects the safety and energy conversion efficiency of the energy storage battery system. Aiming at the above problems, this paper proposes a coordinated control strategy of DC side voltage and grid side active power. Firstly, by considering the active power fluctuation absorbed by the filter inductor on the AC side of the power conversion system, the suppression of the voltage fluctuation on the DC side is realized; Then, the weighted idea is used to coordinately control the voltage on the DC side and the active power on the grid side, and the fluctuation amplitude of the two is well reduced; Finally, the effectiveness and superiority of the proposed method are verified in the simulation.

Key words: power conversion system, unbalanced grid voltage, dc side voltage fluctuation, grid side active power fluctuation, coordinate control, energy storage system safety

OU Mingyong, WANG Yichao, LIU Wenjun, XIA Xiangyang, CHEN Lingbin, LENG Yang, ZHENG Chuyu. Control Strategy of Power Conversion System under Unbalanced Grid Voltage[J]. Electric Power, 2022, 55(7): 93-101.

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Control Strategy of Power Conversion System under Unbalanced Grid Voltage

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