A Novel Control Method of Grid-Connected Inverter during Multiple-Phase Disconnection of Double Circuit Transmission Line after Multiple-Phase Fault in a Weak Grid

The escalating penetration of renewable energy into power systems enforces the grid operators to impose more stringent criterion of fault ride through capability. Nevertheless, the interconnection topology and the transmission line auto-reclosing operation after the fault clearance are rarely considered in extant research of grid-connected inverter control. This paper proposes a novel positive-sequence current control method on the basis of phase and zero-sequence voltage decomposition, and symmetrical current injection and rapid transition of normal operation, single or multiple phase fault and disconnection are realized. The effectiveness of proposed method is verified by simulation.