CONTROL OF BI-DIRECTIONAL DC-DC CONVERTER FOR MICROGRID APPLICATION

Abstract

This paper describes the battery charging and discharging controller for a battery connected with the micro grid. Some instruments or devices connected in a micro grid need uninterruptable power supply so we need a backup power supply system for those devices. Backup supply always increases the power quality of a system by giving a continuous service. In islanding mode of operation battery supply the critical load connected with it and in grid connected condition the main supply operates the devices. The battery feeds some loads in the micro grid in case of any grid failure occurs. This paper describes the operation of a battery from charging to discharging operation smoothly without disturbing the other circuit and critical loads connected to it. Total battery operation divided into three parts charging condition, discharging condition and idle period. There is always a need of interfacing circuit while connecting a battery in the micro grid. This paper describes the interfacing circuit with the charging and discharging controller of battery. The paper describes the power control of a DC-DC bidirectional converter for interfacing battery in micro grid. The proposed controller and the bidirectional converter was designed and the operation verified by using MATLAB/Simulink.