Optimization of Four-step Commutation Strategy of a Matrix Converter

Comparing with the AC-DC-AC converter,the commutation process of a matrix converter(MC)is more complicated due to having no natural free-wheeling paths.The commutation problem is one of the major reasons that there are few practical applications.In this paper,the mechanism involved in the commutation process was analyzed,and based on two line voltage synthesis,several methods for optimizing the commutation process were proposed,including to change the switching sequence,reduce the commutation times and modify the pulse width.The reliability and waveform quality were both enhanced.Simulation results demonstrate the correctness and availability of the methods.