Analysis of action of 50 Hz component protection for 500 kV converter station

To analyze two accidents occurred in±500 kV DC Gezhouba-Shanghai transmission system on Jun.29 and Jul.5 of 2003, the filter model of DC 50 Hz component protection was establish using MATLAB and was proved by waveform attained in the system test on Jul.7. Through the model the correctness of the 50 Hz component protection operation of the above two accidents was analyzed.the failure analysis carried out using MATLAB showed that the signal processing technique represented by MATLAB can play a great role in power system fault analysis and the simulation of control system.