Analysis of a three-port DC-DC converter for PV-battery system using DISO boost and SISO buck converters

Combining a storage device and renewable generation is one of the viable solutions to deal with the intermittency of renewable energy sources. Conventional methods of combining these components involve multistage and single-stage converters. However, there is a trade-off between efficiency and component count. A novel non-isolated three-port DC-DC converter which combines a dual-input single output (DISO) boost and a single-input single output (SISO) buck converters for a photovoltaic (PV) - battery-load system is proposed in this paper. There are five different operation modes to achieve different scenarios for maximum power point tracking, battery charging and load regulation requirements. Experiment results are given to confirm this proposed converter.