基于系统辨识的控制系统设计

Design of control system based on system identification

系统辨识在现代控制理论的迅速发展中,已经成功运用于多种工程应用领域。通过系统辨识研究如何确定系统的数学模型及其参数,它的理论日趋成熟,其实际应用已遍及许多领域。工业过程控制中95%以上的控制系统都具有PID控制器,并且许多高级控制都是以PID控制为基础的。本文介绍了最小二乘法和递推最小二乘法分别对二阶系统进行辨识,并分析比较辨识效果,对辨识出的系统用不同PID参数整定方法确定最优参数,使系统有较理想控制效果。

In the rapid development of modern control theory,system identification has been successfully applied to various engineering fields. Through system identification searching how to determine the mathematical models and its parameters,the theory has become increasingly mature,and its practical application has spread in many areas. As the control theory and technology developing rapidly,PID controllers has been widely used in industrial control. More than 95% of the controlled system has a PID controller and many of the advanced control systems are based on PID controllers.This paper introduces the method of least square method and the recursive least square method respectively to identify a second-order system,comparing the results of different identification methods with the true value.With different controller-setting methods to adjust the PID parameters that are optimal to make the system have an ideal control effect.