基于模型前馈的双有源桥变换器优化控制

Optimal control of dual active bridge converter based on model feedforward

双有源桥直流变换器功能上是一个有效可靠的电压源,在输出负载变化的情况下提供快速的动态响应是非常重要的。为了提升变换器的稳定性和动态性能,提出一种基于模型前馈的优化控制策略。首先,推导了变换器的降阶平均模型并对模型的精度进行了验证;其次,通过变换器的小信号模型及传递函数分析了控制器参数对系统稳定性的影响;然后,采用模型前馈与反馈的控制方法对系统的动态性能进行优化,结果表明基于模型前馈的控制策略能有效提升负载变化时的动态响应速度;最后,通过仿真和实验验证了所提策略的有效性和可行性。

The dual active bridge DC converter is an effective and reliable voltage source,and a fast dynamic response is crucial when the output load changes.In order to improve the stability and dynamic performance of the converter,an optimized control strategy based on model feedforward was proposed.Firstly,the reduced order average model of the converter was derived and the accuracy of the model was verified.Secondly,the influence of controller parameters on system stability was analyzed through the Small-signal model and transfer function of the converter.Then,the dynamic performance of the system was optimized using model feedforward and feedback control methods.The results show that the control strategy based on model feedforward can effectively improve the dynamic response speed when load changes.Finally,the effectiveness and correctness of the proposed control strategy are verified through simulation and experiments.