Cuk变换器指数趋近律滑模PI混合控制策略

The Exponential Approach Law Sliding Mode PI Hybrid Control Strategy of the Cuk Converter

Cuk变换器在发生参数突变和外部扰动时,传统比例积分(PI)控制不能得到满意的动态响应和抗扰性,且传统滑模控制多为电压单闭环设计,电压动态特性较双闭环控制差得多。为此,提出Cuk变换器的一种电压外环滑模控制、电流内环PI控制的控制策略。首先,在PI控制电流内环的基础上,外加滑模控制电压外环,设计基于指数趋近律的控制器,提高系统输出响应的动态性能。其次,给出所提控制器的稳定性分析和参数设计准则。最后,通过与传统双闭环PI控制进行仿真和实验对比,验证了所提控制器具有更好的动态性能和鲁棒性。

As there are parameters change and external disturbance in the Cuk converter,it cannot obtain satisfactory dynamic response and immunity using the traditional proportional integral(PI)control,and the traditional sliding mode control is mostly a voltage single closed-loop design,and the voltage dynamic characteristics are much worse than that of the double closed-loop control.Therefore,a control strategy of voltage outer loop sliding mode control and current inner loop PI control of Cuk converter is proposed.Firstly,on the basis of the PI control current inner loop,the sliding mode control voltage outer loop is added to design a controller based on exponential approach law to improve the dynamic performance of the system output response.Secondly,the stability analysis and parameter design criteria of the proposed controller are given.Finally,compared with the traditional double closed-loop PI control through simulation and experiment,it is verified that the proposed controller has better dynamic performance and robustness.