基于改进幂次趋近律的Buck变换器滑模控制方法研究

为进一步提高Buck变换器输出电压的快速性和稳定性,在幂次趋近律和变速趋近律基础上,提出一种基于改进幂次趋近律的滑模控制方法.该控制方法不仅提高系统动态性能,而且可以根据系统状态自适应调节滑模抖振,直至收敛于平衡点.当系统受到有界外部扰动时,滑模面及其导数能够收敛至平衡点附近的邻域内.将该滑模控制方法应用于Buck变换...

Research on Sliding Mode Control Method of Buck Converter Based on Improved Power Reaching Law

In order to further improve the rapidity and stability of Buck converter output voltage,a sliding mode control method of improved power reaching law based on power reaching law and variable speed reaching law was proposed.The control method not only improved dynamic performance of the system,but also adaptively adjusted sliding mode buffeting according to the system state until it converged to the equilibrium point.When the system was subjected to bounded external disturbances,sliding surface and its derivatives could converge into neighborhood near the equilibrium point.The sliding mode control method was applied to third-order sliding mode controller of Buck converter,and selection range of the sliding surface parameters was given.The effectiveness of the sliding mode control method for Buck converter based on improved power reaching law was verified by simulation and experimental results.