Multi-Battery Management Considering Cell Degradation and Economic Constraints

Microgrids and active distribution networks are persistently facing new challenges as technologies for renewable energy sources and storage are evolving. Battery energy storage systems (BESS) have numerous applications and already are an essential asset to microgrid planning and operation. As some BESS technologies still have high capital costs, a control system that searches the optimal solution, avoiding cell degrading conditions while looking for the lowest grid operation costs, is desired. This paper addresses this matter considering a centralized control of distributed energy storage resources in a microgrid. Two weighting factors representing the negative effects of low state-of-charge and high discharge rates are discussed. Simulations in MATLAB Simulink are developed and the result is a procedure that indicates the best power-sharing ratio between available storage systems, capable of considering simultaneously multiple BESS of different sizes and technologies.