Study on the overvoltage and insulation coordination of flexible DC power distribution network

Flexible DC power distribution network is a new direction of flexible HVDC technology, it is now at the research stage. The advantages and technical difficulties of flexible DC distribution network are analyzed in this paper, and the flexible DC distribution demonstration project prepared to build in Shenzhen is briefly introduced. The overvoltage and insulation coordination is one of the key technologies in the implementation of flexible HVDC projects. By introducing the research status of overvoltage and insulation coordination of flexible HVDC and the problems existing in these researches, and analyzing the differences between the flexible DC power distribution network and the flexible HVDC, the problems need noting in the research of overvoltage and insulation coordination for flexible DC power distribution network are pointed out.