基于一类时滞对象控制方法的探讨

鉴于过程控制中普遍存在时滞现象,探讨了smith预估器和各种控制算法之间的联系,仿真了模型失配、时滞变化及干扰等因素。仿真结果表明:Dahlin-smith控制器和Inner Model Control-smith(IMC-smith)控制器具有响应速度快、超调量小的特点。特别是在模型失配情况下,鲁棒性和抗干扰能力表现突出。模型失配改进型smith结构给系统带来了良好的控制质量,具有对模型参数敏感度小的特点。

Analysis for Control Methods Based on Time-delay Object

As a result of the universal existence of time-delay phenomenon in process control,the relations between Smith predictor and each control algorithm were discussed,and the mismatch of model,the change of delay time and the disturbance were simulated.Simulation results show that Dahlin-smith controller and Inner model control-smith（IMC） controller have advantages of fast response and low overshoot.Especially in the case of the mismatch of model,they have better robustness and stronger anti-interference ability.The improved Smith predictor brings a good quality,which has little sensitivity to the model parameters.