A Model Predictive Control Strategy for Performance Improvement of Hybrid Energy Storage Systems in DC Microgrids

This paper proposes a model predictive control (MPC) strategy that works in tandem with a high-pass filter to perform the current assignment between the battery and SC. This approach automatically restores the SoC of SC after sudden load changes and limits its SoC variation in a predefined range, so that ensure the continuous operation of SC. As a result, the proposed FB-MPC method indirectly enables the MG’s proportional-integral (PI) voltage controller to operate with higher gain values leading to better transient response and voltage quality. The performance of the proposed approach is then validated by simulating the system in MATLAB/Simulink.

Keywords: Filtration-based power/current allocation systems, battery/super capacitor hybrid energy storage systems, model predictive control, stability analysis, state of charge recovery.