Weighted Min—Max Zero-Sequence Component Injection-Based Power Control for Single-Stage Dual-Port Inverter-Fed Motor Drives

Abstract

The single-stage dual-port inverter (SSDPI)-fed motor drive is a high-efficiency configuration for hybrid electric vehicles (EVs). However, the modulation design for the SSDPI is a challenging task since the flexible power distribution between dc-port sources and the desired motor control on the ac side should be realized simultaneously under the unbalanced dc links. Given this, a weighted min-max zero-sequence component (WMMZSC) injection-based power control strategy is proposed in this article to realize flexible power distribution while ensuring the desired motor control with the unbalanced dc links. In the proposed scheme, the WMMZSC is put forward, and the power distribution between sources can be implemented by directly adjusting the weighting factor of the WMMZSC. Furthermore, a modified carrier-based pulsewidth modulation (CBPWM) strategy is proposed to generate a satisfactory output current for the motor under unbalanced dc links, which avoids synthesizing the reference vector in an asymmetrical space voltage vector diagram and simplifies the modulation design. With the proposed scheme, the flexible power distribution between sources in the SSDPI-fed motor drives can be achieved without affecting the motor control. Finally, experiments on a permanent magnet synchronous motor (PMSM)-based laboratory prototype are carried out to validate the effectiveness of the proposed scheme.