基于扰动跟踪的Smith预估器

Smith Predictor Based on Disturbance Tracking

在讨论了Smith预估器优缺点的基础上 ,提出了一种修正的Smith预估器 .该预估器引入闭环反馈控制 ,结构简单 ,且能跟踪扰动 .对含有积分环节的对象 ,进行了仿真 .仿真结果表明 ,模型匹配时具有同Smith预估器同样的效果 ;当模型不完全匹配时通过校正 。

The advantages and disadvantages of Smith predictors were discussed, by means of which a modified Smith predictor was proposed. The closed-loop feedback control scheme was applied to the modified predictor, thus making the predictor be of a simple structure and be capable of tracing the process disturbance. Processes with integral action were then simulated. The results indicate that the modified predictor is of the similar performance as conventional Smith predictors when the models match well, and is of a better stability than the conventional ones when the dismatching models were corrected.