Research on fault recovery method of AC/DC hybrid distribution network with electric vehicle charging station

Abstract

It is very effective to realize fault recovery through the advantages of DC network after the fault occurs in the AC/DC hybrid distribution network. The power transfer can be realized in space and time, through the coordination of voltage source converter (VSC), network reconfiguration and electric vehicle charging station (EVCS). In order to realize the fault recovery of AC/DC hybrid distribution network, the faults are divided into five types according to the fault locations and the connection characteristics between outage areas and power supply. The selection principles of the corresponding VSC control mode set are summarized, and all feasible VSC control modes are obtained. A mixed integer programming model for fault recovery of AC/DC hybrid distribution network with EVCS is established, which takes the minimum weighted outage power of loads as the optimization objective. The power supply recovery is realized from two aspects of space and time, and the effect of fault recovery is greatly improved. The results show that the total weighted outage loads of the proposed strategy are 14.98% lower than only using VSCs and reconfiguration.