The Traveling Wave Protection of HVDC Based on HHT Conversion

It is significant to the whole system or its connected network and to run safely and steadily by detecting and cutting out faults fast and accurately. In this paper, a new transient signal analysis method is got based on the Hilbert-Huang Transform conversion. It's original is that by making simulation on interior and external district of direct current through HVDC transmission model, and using MATLAB to analyze transient voltage signal on every fault, and then a protection project of high voltage direct transmission line is proposed based on HHT. The simulation results show that the scheme overcomes the inherent defects of the traditional algorithm, and makes up for the shortage that the protection is easily affected by the transition resistance and can not be accurately judged when the ground fault occurs, which effectively improves the detection accuracy and speed of the line protection.