A New Zero-sequence Current Suppression Control Strategy For Five-phase Open-winding Fault-tolerant Fractional-slot Concentrated Winding Ipm Motor Driving System

A New Zero-Sequence Current Suppression Control Strategy for Five-Phase Open-Winding fault_ tolerant Fractional-slot concentrated Winding IPM Motor Driving System

Abstract—

            In this paper, a new zero-sequence current suppression control strategy for five-phase open-winding fault-tolerant fractional-slot concentrated-winding interior permanent- magnet (FTFSCW-IPM) motor drive system with common DC bus is proposed. By unequal distribution of the zero voltage vector, the proposed method can well suppress the zero-sequence current caused by dead-time effect that the conventional eliminating method can’t be achieved. First, the Dead-time effect to the zero-sequence current is discussed. Then the zero-axis controller is deigned to obtain the reference common-mode voltage. Last, according to the principle of the unequal zero voltage vector distribution, the switching sequence of the two inverters can be calculated, and the maximum modulation index is also first deduced in detail. The proposed method is proved by the simulation results