Novel Fault Protection Method for Flexible DC Power Systems

Genqi Chen, Qing Duan, Caihong Zhao (), Haoqing Wang (), Guanglin Sha, Jian Gao, Yong Li and Shuiliang Zhou
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Genqi Chen: Shaoxing Power Supply Company, State Grid Zhejiang Electric Power Company, Shaoxing 312000, China
Qing Duan: Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China
Caihong Zhao: Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China
Haoqing Wang: Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China
Guanglin Sha: Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China
Jian Gao: Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China
Yong Li: Shaoxing Power Supply Company, State Grid Zhejiang Electric Power Company, Shaoxing 312000, China
Shuiliang Zhou: Shaoxing Power Supply Company, State Grid Zhejiang Electric Power Company, Shaoxing 312000, China

Energies, 2024, vol. 17, issue 14, 1-15

Abstract: A fault protection method is proposed for flexible direct-current (DC) power systems based on the cosine similarity of currents in current-limiting reactors. The typical characteristics of external and internal faults in a flexible DC power system were analyzed. The principles of cosine similarity and the fault current characteristics of current-limiting reactors were used to distinguish between internal and external faults. The ratio of the average positive and negative voltages of the current-limiting reactor was then used to distinguish the fault types and fault line. Finally, a simulation model of a circular flexible DC power system was constructed using MATLAB/Simulink software (2018b). The simulation results show that the proposed protection scheme can quickly and accurately identify the location and type of faults, and has a strong ability to withstand fault resistance and is less affected by distributed capacitance, noise, and communication delay.

Keywords: flexible DC power systems; current-limiting reactor; cosine similarity; external fault; internal fault (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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