Nonlinear Control of A Three-Port DC-DC Converter for Multi-Directional Energy Exchange

Renewable energy microgrids with solar photovoltaic sources and batteries are becoming more common in small-scale power systems. This paper analyzes an improves a recently proposed three-port DC-DC converter (TPC) for use in microgrids with a common DC bus. Based on the previous modeling analysis of the topology, a nonlinear controller is proposed in this paper to linearize the original circuit model. A system-level control scheme is provided to achieve the energy flow regulation. The simulation model is built in MATLAB/Simulink to validate power flow control and its response improvements.