Bidirectional Converter Optimal Control for Battery Charge/Discharge System

The bidirectional converter is essential to battery charge/discharge system. However, stabilizing output voltage and current of this converter is a complex task due to nonlinear system behaviour, changing load demands, and the battery’s dynamic characteristics. This paper proposes an optimal control method for a bidirectional converter employed in battery charge/discharge system. The control method utilizes a proportional-integral (PI) scheme, in which the parameters are fine-tuned using the sequential quadratic programming (SQP). The proposed method is simulated and validated using MATLAB/Simulink. Simulation results show that the SQP-tuned PI method greatly enhances the control accuracy and stability, compared to classical fixed-gain PI controllers. The combination of classical control with modern optimization reveals a promising method to enhance energy management in DC microgrid and energy storage applications.