Off-line Fault Location for VSC-DC Distribution Network

DC power distribution network has caused widespread concern of scholars and become one of the most important technologies for the future development of the power system in the world, because of its intelligent, flexible and efficient features, and the enormous potential in improving the power quality. However, the power electronic component in DC distribution network can't withstand high current, so the protection requires fast action to isolate the fault current, which causes the lack of fault data used for positioning. The existing positioning method called single ended transient current measurement can't accurately positioning with high fault resistance and noise. Considering the fault has occurred, and DC circuit breaker breaks off quickly, in the condition of loss of power system, this paper uses a detection device, which can accurately locate the fault location, with a certain ability of fault resistance and noise tolerance.