Mechanical Switch Based Adaptive Fault Ride-through Strategy for Power Quality Improvement Device

Yu Shen, Wei Hu, Yaoyao Xiao, Ganghua Zhang, Mingyu Han, Fan Yang and Wenping Zuo
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Yu Shen: Electric Power Research Institute State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Wei Hu: Electric Power Research Institute State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Yaoyao Xiao: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Ganghua Zhang: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Mingyu Han: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Fan Yang: Electric Power Research Institute State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Wenping Zuo: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2021, vol. 14, issue 20, 1-19

Abstract: Cascaded H-bridge power quality improving device (PQID) has garnered extensive attention for its flexible electric energy conversion and fast voltage response. However, the failure rate of PQID is relatively high due to the use of large numbers of power electronic devices. This paper proposes a mechanical-switch based adaptive fault ride-through strategy for improving the operational stability and power supply reliability of PQID. According to the features of the topology and working principle of PQID, this paper summarized the types of internal faults and analyzed the characteristics of different types of faults. Based on the shortcomings of existing mechanical switches as a bypass method, corresponding adaptive fault ride-through strategies are proposed for different types of faults, and a comprehensive simulation test has been carried out. The results show that the proposed strategy can adaptively ride through unit faults and effectively improve the output waveform quality during the ride through time.

Keywords: cascaded H-bridge; power quality improvement device; operating stability and power supply reliability; adaptive fault ride-through strategy; mechanical switches (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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