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Error-voltage based open-switch fault diagnosis strategy for matrix converters with model predictive control method

This paper proposes an error-voltage based open-switch fault diagnosis strategy for matrix converter (MC). First, finite control set-model predictive control (FCS-MPC) method is used to operate the MC. Meanwhile, based on the analysis of the operating state under fault condition, the fault model of MC is established. Second, the fault diagnosis strategy is implemented in three steps: to begin with, the occurrence of fault is detected by monitoring the measured load currents. Then, the faulty phase is identified considering the output line-to-line voltage error. After that, by using the switching state of the faulty phase, the faulty switch is located. The fault diagnosis method can accurately and quickly locate the faulty switch without additional voltage sensors. Finally, simulation results are presented to demonstrate the feasibility and effectiveness of the proposed strategy.