The DC microgrid is a crucial development direction for future power systems.To expedite fault recovery and minimize power outage durations,fault location technology in DC microgrids is of great significance.This paper presents a single-terminal fault location method for DC microgrids based on current waveform fitting.Based on the high-frequency equivalent model of DC microgrids,the time-domain expression of fault current related to fault distance and resistance is derived.The unknown parameters in the time-domain expression are estimated by fitting the measured fault current waveform,enabling accurate estimation of fault distance.Finally,the feasibility and effectiveness of the proposed fault location method are thoroughly verified in the simulation environment of three-terminal circular DC microgrid based on MATLAB/Simulink and the hardware test environment.The results demonstrate that the proposed method offers high accuracy,speed,and noise robustness in fault location.
关键词
直流微电网/保护/故障定位/参数估计/粒子群优化
Key words
DC microgrids/protection/fault location/parameter estimation/particle swarm optimization
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