一种Buck型变换器的滑模变结构PID控制器设计

摘要

A sliding mode variable structure PID controller was proposed for Buck converter combing the initial construction, which combines sliding mode variable structure theory and traditional PID control algorithm. Both problems of overshoot resulted from integrating actions in PID control and chattering in sliding mode control algorithm, and the compound control strategy were convenient to implement and possessing good robustness. Simulation results showed that the control approach could achieve excellent results with short rising time ( about 50 ms) on start stage and small overshoot on sliding mode,which has better transient stability than traditional control algorithm.%针对Buck变换器电路的内部关系,应用滑模变结构理论与常规PID控制的复合控制策略,设计了一种滑模变结构PID控制器.避免了传统PID控制积分引起的超调和滑模控制存在的固有抖振问题,易于工程实现且鲁棒性强.仿真结果表明:与传统的控制技术相比,滑模PID控制器能保证在趋近运动阶段有较短的上升时间(约50 ms),在滑动模态阶段有较小的超调量,提高了系统的暂态稳定性.