A Dual-DC-Port Dual-Output Converter for PV-Battery Hybrid System and Its Flexible Power Management Strategy Based on Virtual SVPWM

The dual-dc-port dual-output converter for photovoltaic (PV)-battery hybrid system is proposed in this paper. Two dc ports, in which one is interfaced with the battery and other one is interfaced with PV, two outputs, in which can be interfaced with different ac loads, are provided simultaneously by the dual-dc-port dual-output converter, which presents high efficiency and low cost with single-stage power conversion. Firstly, the operating modes of PV and battery for the dual-dc-port dual-output converter are analyzed, and the effective switching states of two sets of outputs are analyzed. Then, to achieve the flexible power management between PV, battery and two sets of ac loads, the virtual space vector pulse width modulation (VSVPWM) is proposed. In order to reduce the voltage vector arrangement combinations between two sets of outputs, the idea of topological decoupling and switch driving signal splicing is proposed, which can greatly reduce computational complexity and program programming. Finally, the effectiveness of the proposed scheme is verified through experimental results.