滞后削弱器控制系统的设计

Design of Decreasing Delay-time Control System

将大滞后的对象演变成小滞后的对象,按平方误差积分准则设定点最优整定算法整定比例积分微分(PID)控制器参数.采用Simulink对不同Lm时的滞后削弱器控制系统的阶跃响应进行仿真,结果表明,系统加入滞后削弱器后,只能把等效对象的纯滞后时间变小,但不能消除纯滞后时间.滞后削弱器对大滞后系统的控制效果很好,且优于经典PID控制系统,利用滞后削弱器可以用PID控制器来控制大滞后系统.

The method of decreasing delay-time controller is presented. Firstly, the large delay-time plant is remodeled into small delay-time plant. And then the parameters of optimal proportional-integral derivative （PID） controller are tuned by integral of square error （ISE） criterion. The relationship between the step responses of decreasing delay-time control system and the parameter Lm is simulated by Simulink. The simulation results show that the decreasing delay-time con troller only can decrease delay time, but can＇t cancel delay time. The effect of decreasing delay-time control system is very good. Using decreasing delay-time controller, the large delay-time system can be controlled by PID controller.