SoC Based Multi-Mode Battery Energy Management System for DC Microgrids

Renewable based DC microgrids are being widely deployed due to its increased efficiency compared to AC networks. An energy storage system helps to cater power flow imbalances due to the intermittent nature of renewable energy sources and varying load conditions. An adaptive Battery Energy Management System (BEMS) to ensure efficient operation of the battery storage system is proposed in this study. The state of charge (SoC) level management is of great importance for the prolong battery life, minimizing the capacity fade and avoiding over draining of the battery storage. Monitoring SoC level, DC bus voltage regulation and ability to provide backup power are the main considerations in designing the proposed BEMS. Performance of the proposed control algorithm was evaluated using PSCAD/EMTDC simulation results, and is presented in this paper.