Fault-Tolerant Topologies and Switching Function Algorithms for Three-Phase Matrix Converter based AC Motor Drives Against Open and Short Phase Failures

Abstract

A study of fault-tolerant matrix converter is presented for remedial topological structures and control techniques against both open-faults and short-faults occurring in the ac-ac matrix converter drives. Topologies of the matrix converter drives have been proposed to allow the matrix converter based drives for tolerating both open and short phase failures. Switching function algorithms with closed form expressions, based on switching matrices, have been developed to provide the matrix converter drives with continuous and disturbance-free operation after opened phase faults and shorted phase failures. The developed switching function matrices, containing symmetric and antisymmetric mode matrices with appropriate sequences of input voltages, allow to synthesize redefined output waveforms under the open-phase and short- phase faults. In addition, the matrix converter topology and the switching scheme are proposed to produce three-phase balanced sinusoidal output currents even after short-phase failures. Simulation and experimental results shows the feasibility of the proposed topologies and the developed switching function techniques in case of both the open-phase and short-phase faults.