Current-Source Inverter Fed Five-Phase PMSM Drives With Pentagon Stator Winding Considering SVM Scheme, Resonance Damping, and Fault Tolerance

Abstract

Current-source inverter (CSI) is considered as a promising candidate in the permanent magnet synchronous machine (PMSM) drive system, for its higher reliability and mitigated electromagnetic interference (EMI). In this paper, the control scheme of CSI-fed five-phase machine drives with pentagon winding connection (PWC) is investigated. Filter capacitors are in parallel with each winding to bypass the pulsating current. The vector space distribution of PWC-CSI is presented which is different from that of star winding connection-CSI (SWC-CSI). A novel dual-plane space vector modulation (SVM) is proposed to actively control the third harmonic component. To address the parallel resonance issue, the dual-loop current controller is adopted. Inner voltage loop is for resonance damping, whereas outer current loop is for current regulation. A precise <i>s</i>-domain model of current controller is built for the stability evaluation and parameter tuning. A comparative analysis between five-phase PWC-CSI and SWC-CSI is carried out. The PWC configuration can enhance the harmonic suppression, and exhibits lower dc-link voltage than SWC under the same condition. To explore the fault tolerant capability of PWC-CSI, the inverter single-phase open-circuit fault is analyzed and the post-fault current forms of four remaining healthy phases are re-calculated. Experiments are performed to validate proposed schemes.