A Fault-tolerant parallel inverter applied to micro-grid

A topology structure of the fault-tolerant parallel inverter applied to micro-grid has been proposed in this paper. In normal operation state, two parallel inverters run stably. The structure of the fault-tolerant inverter is reconstructed after failure. The reconfiguration of the fault-tolerant inverter results in the phase voltage deviation and the circulating current between the two parallel inverters. The circulating current between the parallel inverters is reduced greatly by increasing the inverter filter capacitor value to support the DC side voltage. Simulation results verify the validity and effectiveness of the proposed topology structure.