Design, Control and Analysis of Bi-directional DC-DC Converter with Battery Management System for Low Voltage Applications

Abstract

A Nanogrid is a model version of a smart grid with the ability to function as separate power generator. This feature allows for this grid to power single loads and apply for special applications. The DC Nanogrid comprises of a bi-directional converters along with Battery Management system (BMS). It draws powers from the grid in the absence of renewable energy sources and BMS to meet the load demand. The BMS generally uses bidirectional DC-DC converter for charging and discharging of the battery at regular interval. In this work detailed analysis of bidirectional DC-DC converter is presented and the simulation has been carried out using MATLAB. PI controller is designed and PWM scheme is planned, from step down to step up and step up to step down mode automatically based on source voltage. The constructed control logic offers bidirectional voltage regulation. The battery charging and discharging characteristics are realized.