Bidirectional Multiport Converter for Hybrid Solar-Battery System

This paper presented a new bi-directional multiport DC–DC converter for hybrid solar-battery systems by offering efficient energy conversation between battery storage, photovoltaic panel, and DC grid or load. This three ports converter is developed from the differential converter concept by using the battery to boost the PV energy transmission. Thus, the effective boost ratio is further enhanced. Multiple modes are covered, including double-in-single-out, single-in-double-out, and single-in-single-out. It keeps a simple circuit structure and is easy to control. By controlling battery charging and discharging current amount, the power flow can flexibly meet the need of the fluctuating loads. The circuit operation, circuit analysis, and design requirements are discussed in detail. A 200W experimental platform has been built to verify the performance of the decentralized solar battery system. All the results are shown in good agreement with the theoretical knowledge.