A Reconfigurable Non-Isolated Three-Port Converter with Hybrid Quadrilateral Current Modulation for Wide-Range Soft-Switching in PV-Storage Systems

Addressing limitations in conventional non-isolated three-port converters (TPCs) for photovoltaic-energy storage (PV-ES) systems—such as restricted voltage range, high hard switching losses, and soft-switching performance dependent on load power, this paper proposes a reconfigurable, high power density, lossless non-isolated TPC. By integrating a dual-output architecture with the concept of power-path reconfiguration, single-stage wide-voltage-range energy conversion among the PV port, ES port, and load port is achieved. Combining an inductor series mechanism and switch parallel capacitor design, a hybrid reconfigurable quadrilateral modulation method for inductor current is proposed. This enables TPC to achieve full-load-range zero-voltage switching (ZVS) across a wide input voltage range of 29.43V to 80V, increasing the maximum power transfer capability to 512.99W. Furthermore, aiming to minimize the root-mean-square inductor current, the optimal duty cycle combinations for achieving full-load-range soft-switching in multiple operating modes are determined, significantly reducing switch conduction losses and inductor losses. Experimental results demonstrate that the proposed TPC achieves full-range ZVS in all three modes: single-input dual-output, dual-input single-output, and single-input single-output. It achieves a peak efficiency of 97.1% at rated power with voltage ripple below 0.71%. This work provides theoretical and technical support for efficient energy management in PV-ES systems.