Three-Port Fourth-Order Boost Converter for Renewable Energy Application

This paper presents a new three-port fourth-order two-switch boost converter that integrates renewable energy sources like photovoltaic (PV) panel with battery for managing varying load power demand irrespective of variation in the weather conditions. The converter operation is explained for various modes and a steady-state with time-domain analysis is carried out to evolve the high-gain feature of the converter. A small-signal multivariable dynamic model is mathematically derived to design the control loops using the relative gain array (RGA) approach. Simulation and experimental results are given for the 24/ 48 V, 50 W system.