Hybrid DC-DC Converter for DC Microgrid Applications

Abstract

This article, presents a hybrid converter for micro-grid application is proposed. It consists of a Solar PV as a DC source, and a storage battery to power a local DC load. The proposed converter is a simple circuit that integrated a bidirectional half-bridge DC-DC converter and a boost converter to perform charging, discharging of storage battery, and MPPT control respectively. The MPPT control for solar PV is achieved using Perturb and Observe method. A closed-loop control system is developed using PI control to charge and Discharge the battery. This DC micro-grid is integrated with the grid system and the performance of the converter is evaluated using MATLAB/Simulink software. In comparison to existing converters, the proposed converter has a lower number of power components and achieved an efficiency of 95.7%.