An Islanded Microgrid with Novel Fault Tolerant Inverter

A novel fault-tolerant inverter applied in this islanded microgrid is proposed in this paper. Firstly, the topology structure and the working principle of the microgrid with the fault-tolerant inverter are provided. The fault-tolerant inverter allows the switching devices of different bridge arms to be reconstructed, which improves the fault-tolerant space. A fault-tolerant pulse signal algorithm is proposed, combined with the droop three-loop control to form a control method for the fault-tolerant inverter. It is no need to switch the control algorithms between the normal operating mode and the fault-tolerant mode. The reliability of the system is improved. The circulating currents eliminating method between the two inverters when the fault-tolerant inverter is in fault state are analyzed. Finally, the validity of the topology and the control strategy of the system is verified by simulation.

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