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Post-fault operation for five-phase induction machines under single-phase open using symmetrical components

This paper presents a current optimization technique based on symmetrical components theory for a five-phase full-pitch induction machine (IM) under an open circuit phase fault condition. A controller is proposed to maximize the magnitude of positive sequence component and minimize the magnitude of negative sequence component of the fundamental and the third harmonic currents based on symmetrical components. Further, other than the positive sequence current, magnitudes of the sequences are less than those of a conventional controller by using the genetic algorism so as to reduce the couple degree between different harmonic subspaces. Its feasibility has been verified in experimental tests with a five-phase IM.