基于指数趋近律的双有源桥变换器滑模控制策略

Sliding mode control strategy for dual active bridge converter based on exponential approach law

为提升双有源桥(DAB)变换器的动态性能,提出了一种基于指数趋近律的滑模控制策略。首先,通过降阶模型法推导出DAB变换器的数学模型作为等效部分;其次,选取指数趋近律作为切换部分,使两部分共同作用组合成滑模控制器,调节DAB变换器的输出电压;最后,利用Lyapunov稳定性理论证明了该控制方法的稳定性。仿真实验结果显示,设计的滑模控制器有效减小了抖振,对扰动的响应速度更快,比传统比例积分控制器具有更好的动态性能。

To improve the dynamic performance of the dual active bridge(DAB)converter,a sliding mode control strategy based on the exponential reaching law is proposed.The mathematical model of the DAB converter is derived using the reduced-order modeling method as the equivalent part,and the exponential approach law is selected as the switching part.The two parts are combined to form a sliding mode controller to regulate the output voltage of the DAB converter.The stability of the control method is proven by the Lyapunov stability theory.The simulation results show that the designed sliding mode controller effectively reduces chattering,has a faster response speed to disturbances,and has better dynamic performance than the traditional proportional-integral controller.