Fault tolerant strategy for inverter stage in indirect matrix converter

This paper proposes an open circuit fault tolerant strategy with a fault detector for the inverter stage in indirect matrix converter (IMC). When an open switch fault occurs in IMC, the location of faulty switches in the inverter stage can be exactly identified by the fault detector which compares the output voltages of the analytical model with the measured output voltages. In order to keep the continuous operation without output voltage fluctuation, the fault tolerant strategy is developed to control indirect matrix converter based on the concept of four-leg matrix converter. The proposed fault tolerant strategy can maintain the same output performance during the faulty condition as the healthy condition. Simulation results are given to verify the effectiveness of the proposed method.