Effect of Inverter-type Distributed Power Supply Access on the Zero Sequence Current Distribution of AC Lines

For the Inverter-Interfaced Distributed Generator (IIDG) access system, a ground fault occurred on the 110 kV contact line, and the zero-sequence current distribution on both sides of the line was analyzed by combining the characteristics of the controlled current source of the IIDG after the fault, the relationship between the sequence quantities, the neutral grounding method of the transformer and the access capacity of the IIDG. Factors. The analysis points out that the IIDG access side transformer neutral grounding mode determines the zero sequences current distribution on both sides of the line; when the system side circuit breaker is disconnected, the IIDG access capacity mainly affects the zero sequences current distribution, and the local load power level has a small effect on the zero sequence current distribution. The correctness of the theoretical analysis is verified by PSCAD/EMTDC software simulation.