Research on Fault Identification of Hybrid Multi-Feed High-Voltage Direct Current System Based on Line Commutated Converter and Voltage Source Converter

Ting Wang (), Kun Chen, Long’en Zhang, Xingyang Hu, Hengxuan Li and Pangqi Ye
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Ting Wang: State Grid Hubei Electric Power Research Institute, 227 Xu Dong Street, Wuhan 430077, China
Kun Chen: State Grid Hubei Electric Power Research Institute, 227 Xu Dong Street, Wuhan 430077, China
Long’en Zhang: State Grid Hubei Electric Power Research Institute, 227 Xu Dong Street, Wuhan 430077, China
Xingyang Hu: State Grid Hubei Electric Power Research Institute, 227 Xu Dong Street, Wuhan 430077, China
Hengxuan Li: State Grid Hubei Electric Power Research Institute, 227 Xu Dong Street, Wuhan 430077, China
Pangqi Ye: State Grid Hubei Electric Power Research Institute, 227 Xu Dong Street, Wuhan 430077, China

Energies, 2024, vol. 17, issue 9, 1-17

Abstract: With the rapid development of voltage source converter (VSC) and line commutated converter (LCC) technology and the relative concentration of power and load, the inverter station of the flexible DC system is fed into the same AC bus with the conventional DC rectifier station, and the high-voltage direct current (HVDC) parallel hybrid feed system is formed in structure. As the electrical distance between the converter stations is very close, when a fault occurs in the near area, the current on the AC wiring on the VSC side will fluctuate greatly, resulting in the misoperation of the AC wiring protection. For this reason, this paper proposes a fault identification method based on VSC/LCC hybrid multi-fed HVDC system, which discriminates the fault and outputs the protection signal according to the protection criterion, and logically judges the combination of the output protection signal to identify the fault type. The simulation results show that the method can identify all kinds of faults of hybrid multi-feed DC system and solve the problem of protection misoperation of the hybrid multi-feed DC system.

Keywords: LCC HVDC; VSC HVDC; hybrid multi-feed HVDC system; fault identification; PSCAD/EMTDC system simulation (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: 2024
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