Publication

Abstract : This research paper presents comparative analysis between Z-source converter and boost converter suitable for charging 48 V battery system. Renewable sources like solar, wind and hydro are an alternative to conventional sources in the aspect of producing pollution free electrical energy. Photovoltaic cell is utilized as input source for this system as it has benefits of high reliability and long life as compared to hydro and wind energy sources. Maximum power is extracted from the panel using perturb and observe MPPT technique for charging the battery. Lead-Acid battery is preferred for it’s low installation cost and maintenance-free operation. The battery charging involves three stages namely bulk stage, absorption stage, float stage and proper charging ensures longer life-time. The charging control algorithm presented is based on current regulation technique ensuring over-charge protection. This paper focuses on operating the boost converter with low duty ratio and safely charging the Lead-Acid battery for solar lighting application. The dc-dc converter is designed to boost from 12 V input to 48 V output. The system is modelled and analyzed using MATLAB/Simulink® for various irradiance conditions.