基于电容能量平衡的动态最优比例-积分控制

The low-frequency pulse load poses a new challenge to the reliability of the power supply system. To adapt to sudden changes in pulse frequency, higher requirements are imposed on the dynamic performance of the converter. The conventional proportional-integral (PI) control cannot simultaneously ensure both excellent dynamic and steady-state performance. The capacitor energy balance control method can achieve high dynamic performance. However, it requires additional output compensation for the converter’s active current, and its implementation complexity hinders widespread adoption. This article develops an optimized dynamic PI control strategy for three-port rectifiers to address low-frequency pulse load challenges, leveraging capacitor charge balance control (CBC) for enhanced performance. By analyzing the optimal transient trajectories of voltage and current during pulse frequency step changes, the corresponding dynamic controller parameters are prestored based on actual operating conditions. When the pulse frequency changes, rapid active current adjustment within a single pulse cycle is achieved by modifying the outer-loop parameters. This approach maintains the decoupling voltage recovery curve near its optimal trajectory without requiring additional compensation. A three-port rectifier prototype was developed, and experimental results validate both the effectiveness and feasibility of the proposed control method.