Double-Modulation-Wave PWM-Based Power Flow Control of Single-Stage Dual-Port Inverters for Hybrid Electric Vehicles

The single-stage dual-port inverter (SSDPI) emerges as a high-efficiency power-electronic interface for hybrid electric vehicles (HEVs) due to the removal of dc-dc converters and the reduction of the power conversion stage. However, the modulation design of this configuration encounters challenges in power flow control, primarily due to the inherent coupling characteristics of SSDPIs and imbalanced dc-port voltages. In view of this, this article proposes a double-modulation-wave pulsewidth modulation (DMW-PWM) scheme to achieve power flow control under imbalanced dc-port voltages. By decomposing the original modulation wave, double-modulation waves with port-voltage-adaptive amplitudes are obtained and provide a degree of freedom for power flow control. Each modulation wave is used to manage one port, facilitating the derivation of the mathematical relation between port power and modulation wave amplitude. Based on this, power flow control is achieved by regulating modulation wave amplitude via the decomposition factor. Besides, zero-sequence component injections (ZCIs) are adopted to double-modulation waves for the power distribution range expansion. Experimental results validate that the proposed scheme realizes motor drive control and power flow control with the expanded power distribution range.