用于时滞不确定系统的自适应Smith预估器

An Adaptive Smith Predictor Used in Systems with Uncertain Time-Delay

Smith预估器对模型的依赖性制约了它在实际中的应用 ,文中提出一种改进型Smith预估器 ,能在线地跟踪时滞不确定对象的时滞时间常数的变化引起的系统输出的变化 ,调节模型输出使得闭环系统稳定 ;而且 ,模型中不含有时滞环节 ,控制器只有一个调节参数 ,易于实现 ;对一大惯性、大时滞系统的仿真结果表明 ,改进算法较好地解决了Smith预估器的稳定性对模型时滞时间常数的依赖性问题 。

The dependence on models has severely limited the practical application of Smith Predictors. A modified Smith Predictor is presented in this paper that can follow the change of the output of the system caused by the change of time delay parameter in an uncertain time delay system on line and adaptively adjust the output of the model to enhance the stability of the system. Moreover, there is no time delay part in the model,but only one adjustable parameter, which makes the predictor very easy to operate. The simulation result shows that the stability of the system is satisfactory. This algorithm can better solve the problem brought by the dependence of the Smith Predictor on the model,and will be widely used.