Short Circuit Fault Control Strategy for Flexible Direct Distribution Network Based on Fault Current Limiter

Aiming at the problem that fault current limiter does not distinguish between fault type and fault current in flexible DC distribution network, and it will be put into operation once fault occurs, this paper proposes a short-circuit fault control strategy for flexible DC distribution network based on fault current limiter. Firstly, a fast identification method of flexible DC distribution network based on traveling wave method is proposed, and then the current characteristics of single-stage grounding fault and inter pole fault are analyzed. According to this, the intelligent switching strategy of fault current limiter is proposed, which can intelligently select whether to put into operation according to the size of fault current and save cost. Finally, the correctness of this method is verified by building a four terminal medium voltage distribution network model in Matlab/Simulink.