A Simple Deadbeat Predictive Current Control for OW-PMSM Drives Based on Reference Voltage Redistribution

Zero-sequence current (ZSC), which inherently exists in the open-winding permanent magnet synchronous motor (OW-PMSM) with a common dc bus, would deteriorate the control performance of the system and add additional losses. Conventional proportional-integral (PI) controller involves the simultaneous adjustment of several parameters, which is an extremely time-consuming process. To solve these problems, this article proposes a simple deadbeat predictive current control (DPCC). First, a reference voltage weight factor is designed to redistribute the reference voltage of the dual-inverter, which makes the zero-sequence voltage generated by the nonzero voltage vector (VV) and the third harmonic back electromotive force cancel. Consequently, ZSC can be completely suppressed. Second, the zero VV u(7)(111) are excluded from the modulation, so the switching frequency of the dual-inverter and common mode voltage can be effectively reduced. Meanwhile, the effective modulation range is analyzed in this article, which reveals the relationship between the ratio of the third harmonic flux linkage and the modulation index. Finally, the effectiveness and advantages of the proposed method are verified on a 1.25-kW OW-PMSM experimental platform.