A Single Current Regulator Method with Wider Operation Range for PMSM Operating under Six-Step Mode

Single current regulator (SCR) methods are popular for rail transit traction permanent magnetic synchronous motor (PMSM) operating under six-step mode, for the advantages of maintaining constant voltage amplitude and providing good dynamic performance. The applicability for SCR methods, which depends on the regulator structures, are different. The existing SCR methods cannot use one set of regulator in the whole range, which would lead to system instability when system operates near the transition points. This paper proposes a SCR method that can maintain regulator structure constant in the whole operation range, which is applicable for infinite speed PMSM drive system.