Study on DC Breaker Fault Current and Its Limiting Method of Multiterminal Flexible DC Distribution System

Jinghan Zhang, Yuqun Gao, Fanglei Xiao, Fang Guo, Xinwei Li, Yongxia Han and Licheng Li
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Jinghan Zhang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yuqun Gao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Fanglei Xiao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Fang Guo: China Energy Engineering Group Guangdong Electric Power Design Institute, Guangzhou 510670, China
Xinwei Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yongxia Han: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Licheng Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2019, vol. 12, issue 5, 1-15

Abstract: The multiterminal flexible DC (MTDC) distribution system has become a hot research topic for its advantages such as new energy load accessibility and high reliability of power supply. However, the fault current during short-circuit faults will be more complicated and serious because of the multiple operating modes and specific converter structure in MTDC distribution system. The high fault current will affect the safety of equipment and system operation. As a result, it is necessary to study the fault current generation mechanism and current limiting method of the DC distribution system. In this paper, the generation mechanism, transient characteristics, and the influencing factors of the fault current in the DC breaker during the short-circuit faults are analyzed by theoretical analysis and simulations separately based on a ±10 kV three-terminal flexible DC distribution system. The current limiting devices are analyzed, and its configuration position and parameter calculation method are proposed. On this basis, the parameters of the current limiting reactor and its effects on each position are analyzed by electromagnetic transient simulations. The current limiting scheme is proposed and its reliability is verified. The study results can provide some reference for overcurrent analysis and current limiting measures of the multiterminal DC distribution system.

Keywords: multiterminal DC system; DC distribution network; fault current limiting; PSCAD (Power System Computer Aided Design) (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: 2019
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