Optimal Control based Charging/Discharging Strategy of Dual Battery Energy Storage System for Wind Power Dispatch

This paper proposes a control strategy for the dual-BESS system using optimal control. Previously designed one-step MPC (Model Predictive Control) based strategy is extended for a dual-BESS case. To this end, a two-stage optimal control problem is solved. Since the resulting algorithm for charging and discharging of dual BESS comes in the form of a simple if-then statement, it is easy to implement. The simulation results show that the proposed method makes the capacity firming successfully achieved, while the SoC (State of Charge) of the BESSs are maintained in rated intervals and the stored energy of each BESS is balanced.