基于模糊滑模的Buck变换器控制算法研究

Fuzzy Sliding Mode Control Algorithm Based on Buck Converter

针对系统采用滑模指数趋近律时,Buck变换器具有超调大,鲁棒性不强等缺点。在三阶Buck变换器状态空间模型基础上,将模糊控制和滑模控制相结合,设计了一种基于模糊控制的指数趋近律,通过输入负载电压偏差和负载电压偏压的变化率,自适应调整指数趋近律的参数,进而调节系统输出的轨迹,有效提高了系统动态性能,增强了鲁棒性。构建Simulink模块,并通过Matlab/Simulink仿真,进一步验证了算法的有效性。

In view of the system using sliding mode exponential reaching law,the Buck converter has big overshoot,and robustness is not strong. Based on the third-order Buck converter space model,combining fuzzy control and sliding mode control,a new kind of fuzzy sliding mode exponential reaching law is designed. Through the input load voltage deviation and the change of load voltage bias rate,it adjusts the exponential reaching law adaptive parameters,and then adjusts the system output trajectory. It effectively improves the dynamic performance of system and enhances the robustness. The Simulink module is built,and through the Matlab/Simulink,the effectiveness of the algorithm is further verified.