A New Method for HVDC Grounding Electrode Line Protection Based on Multi-Band Voltage Amplitude Integration

In order to improve the fault monitoring performance of grounding electrode lines in high voltage DC (HVDC) transmission systems, a new grounding electrode line protection based on multi-band voltage amplitude integration is proposed in this paper. Firstly, the voltage spectrum under normal operation and fault were analyzed. It was found that the voltage under different frequency bands will change greatly after fault occurred in grounding electrode line. Based on this, a new fault identification criterion using the voltage amplitude integration is proposed in this paper. A large number of simulation experiments based on PSCAD/EMTDC show that this method can effectively identify various faults on the grounding electrode line, which is less affected by the fault resistance and has a good application prospect.