Pilot Protection Based on Zero-Sequence Current Resistance-Capacitance Component for Large-Scale Inverter-Interfaced Power Stations

At present, zero-sequence current protection is generally used as the main for single-phase ground faults in resistance-grounded inverter power stations. However, limited by principle, it difficult to take into account selectivity and rapid action when neutral point resistance large, so there mismatch with inverter-type supply low voltage ride through leads risk of large-scale disconnection non-fault lines. Aiming at above problems, firstly, a fault analysis model station considering capacitance established study distribution characteristics resistive capacitive currents collection system, short circuit occurs on different types Then, based characteristic difference between components flowing two ends tie line case internal external faults, pilot algorithm formed. Compared traditional differential protection, proposed only transmits logic information without synchronous sampling, has significant economy. Finally, feasibility effectiveness are verified an engineering simulation example.