A Novel AC/DC Magnetically Isolated Control Topology for Zero-Sequence Current Magnetized Memory Machine System

This paper proposes a novel AC/DC magnetically isolated circuit topology and the corresponding control strategy for zero-sequence current magnetized memory machine (ZSCM-MM). The physical separation of normal drive and magnetization manipulation for ZSCM-MM is truly realized by controlling switcher action in the proposed topology. As the zero-sequence loop (ZSL) is disabled in the normal drive operation, either the unintentional magnetization or demagnetization is avoided for the practical application of ZSCM-MM. While in the magnetization operation, the ZSL is activated so that the MS can be controlled autonomously. Compared with traditional open winding drive topology, the harmful effects caused by the suppression of zero-sequence current (ZSC) for the machine system can be avoided in the proposed topology. One control strategy which consists of both drive and magnetization control is proposed for the proposed topology. The validity of the proposed control topology as well as strategy has been demonstrated by simulation.