Traveling wave signal extraction and fault identification for HVDC based on time-domain integration

The criterias of fault identification in HVDC fault location device is developed from the traveling wave protection. But the sampling frequency and signal band of the fault location device is higher, so that the fault location device is more seriously disturbed by clutter, especially the periodic narrow pulse interference. In order to solve the above problems, the paper proposes a novel criteria of fault identification which is based on the time domain integral of the orignal signal. Through the time-domain integration, the steady-state component can be restored and the fault component can be extracted, so as to improve the reliability of fault identification and constrain the influence of the narrow pulse interference. The effectiveness of the method is verified by the EMTDC simulation and the site data in paper.