基于动态矩阵控制的DAB变换器电流应力与回流功率优化方法

Optimization Method of Current Stress and Backflow Power of DAB Converter Based on Dynamic Matrix Control

针对双重移相控制的双有源桥(DAB)变换器存在的电流应力和回流功率问题,建立了电流应力和回流功率的权重优化函数,其设计原则为保证电流应力抑制效果并同时减小回流功率。分析了权重因子的优化选取过程,从而获取2种工作模式下DAB变换器的内、外移相比。为了改善DAB变换器输出电压的动态响应性能,提高负载适应性和鲁棒性,提出了基于动态矩阵控制的电压预测控制方法。最后,结合StarSim实时仿真机和DSP芯片搭建了DAB变换器的半实物实验平台,实验结果验证了所提控制策略在提高DAB变换器电压动态响应性能、抑制电流应力和减小回流功率方面的有效性和正确性。

Aiming at the current stress and the backflow power problems of dual active bridge(DAB)converters with dual-phaseshift control,this paper establishes the weight optimization function of the current stress and the backflow power.Its design principle is to ensure the current stress suppression effect and reduce the backflow power at the same time.The optimization selection process of the weighting factor is analyzed to obtain the inner and outer phase-shift ratio of the DAB converter in two working modes.In order to improve the dynamic response performance of the output voltage of the DAB converter and improve the load adaptability and robustness,this paper proposes a voltage predictive control method based on dynamic matrix control(DMC).Finally,by combining the StarSim real-time simulator and DSP chip,a half-physical experimental platform for the DAB converter is built.The experimental results verify the effectiveness and correctness of the proposed control strategy in improving the dynamic response performance of the DAB converter voltage,suppressing the current stress and reducing the backflow power.