双有源全桥DC-DC变换器的电流应力优化控制

Current Stress Optimization Control for Dual Active Full Bridge DC-DC Converter

针对双有源全桥DC-DC变换器的电流应力大、动态性能差问题,在三重移相控制的基础上,结合电流应力优化方案,提出了一种模型预测及负载电流前馈控制的方法。首先,通过电流应力优化方案对传输功率进行分区,并引入负载电流前馈控制优化内移相角;其次,通过变换器输出电压预测模型优化外移相角,使电流应力减小,提高变换器应对输入电压及负载突变的动态响应能力。仿真结果表明:与传统模型预测控制及电流应力优化控制相比,该优化方法在提高变换器动态性能,保持输出电压稳定的同时,显著降低了变换器的电流应力。

Aiming at the problems of high current stress and poor dynamic performance of dual active full bridge DC-DC converter,a model prediction and load current feedforward control method was proposed based on triple phase shift control and current stress optimization scheme.Firstly,the transmitted power was partitioned by the current stress optimization scheme,and the load current feedforward control was introduced to optimize the inward shift phase angle.Secondly,the output voltage prediction model of the converter is used to optimize the out-shift phase angle to reduce the current stress and improve the dynamic response of the converter to the input voltage and load mutation.The simulation results show that compared with the traditional model predictive control and current stress optimization control,the optimization method can improve the dynamic performance of the converter and keep the output voltage stable,while significantly reducing the current stress of the converter.