基于积分全局滑模控制的双闭环直流调速系统设计

Design of Double Closed-loop DC Speed Control System Based on Integral Global Sliding Mode Control

针对直流调速系统自身运行参数变化和外界干扰,造成系统性能降低,为了改善系统的跟随能力,采用积分全局滑模控制策略设计直流调速控制系统;为了消除到达阶段和缩短系统响应时间,在切换函数设计中,添加了一个收敛的指数时变因子项;在控制律中,将参考输入和系统误差状态变量纳入其中,使系统能根据外部输入和自身状态快速响应。仿真结果表明,所设计的积分全局滑模控制器对参数摄动和负载转矩干扰具有较强的鲁棒性,且跟随响应快。

According to operating parameter variations and external disturbances of DC speed control system, resulting in reducing the performance of the system, DC speed control system is designed using integral global sliding mode control strategy to improve the following ability of system. In order to eliminate the reaching phase and shorten the response time of system, a convergent exponential time - varying factor is added in the design of switching function. In the control law, the reference input and the system error state variables are included, which enable the system to quickly respond according to the external input and its state. The simulation results show that the designed integral global sliding mode controller has strong robustness for parameter perturbation and torque disturbance and its following response is faster.