Switched Capacitor Converter-Based PWM Plus Phase-Shift Control Multiport Converter with Differential Power Processing Capability for Photovoltaic Systems

Photovoltaic (PV) systems consist of multiple dc-dc converters, such as a front-end converter for PV panel control and bidirectional converter for battery regulation. In addition, a differential power processing (DPP) converter is desirably installed to preclude partial shading issues of the significant reduction in energy yield and occurrence of multiple maximum power points. To simplify such PV systems by reducing the converter count, this paper proposes a novel multiport converter (MPC) based on a switched capacitor converter (SCC) with DPP capability. The proposed MPC can be derived by integrating a noninverting PWM buck-boost converter, SCC, and phase-shift (PS) SCC with sharing switches, realizing the simplified system and circuit. The proposed MPC can regulate the load and battery by PWM and PS controls, respectively, while precluding the partial-shading issues by its DPP capability. The experimental verification using a 150-W prototype demonstrated the load and battery could be independently regulated with preventing the partial shading issues.