长初级直线感应电动机时延补偿控制策略

摘要

长初级双边直线感应电动机采用电流内环与位置外环相结合的双闭环控制策略时,内外反馈环引入的时间延迟恶化了控制系统的性能.针对电流内环具有确定性时延,采用了传递函数有理化的分析方法,同时针对位置外环网络传输时延的不确定性,设计了基于网络状态估计的PID参数增益调度方法对时延进行补偿.利用Matlab/SIMULINK建立了长初级双边直线感应电动机模型来分析上述时延补偿策略,仿真表明该方法是可行的.实验结果显示,采用该方法位置偏差小于0.12％,速度误差小于0.3％,进一步验证了理论分析的正确性.%When current feedback as the inner feedback-loop and position feedback as the outer feedback-loop are adopted in long primary double-sided linear induction motor control system, the system performance is deteriorated by the time delay both the inner and outer feedback-loop introduced. For the inner current feedback loop whose time-delay is transparent, the method of rational approximation of transformation functions is adopted. While for the outer position feedback loop whose time-delay is stochastic, the algorithm of PID parameter gain schedule based on network state estimate is proposed. Then, the model of long primary double-sided linear induction motor was established in Matlab/Simulink to analyze the time-delay compensation algorithm, whose feasibility was proved by the simulation. The experiment result shows that when the time-delay compensation algorithm is applied in the control system, the position excursion is less than 0. 12% and velocity excursion is less than 0. 3% , which further indicates the validity of the method.