一种非线性系统自适应观测器的仿真研究方法

An Approach of Adaptive Observer for Nonlinear System

感应电机无速度传感器的控制系统是典型的非线性系统,非线性系统的控制和分析可采用自适应观测器的方法。但采用此方法在极点配置时会存在不稳定区域的问题。因此,应用Lyapunov稳定性原理,给出了观测器的速度辨识率,并建立一个全阶自适应状态观测器。同时,为提高非线性系统的鲁棒性,建立了一个在MAT-LAB6.5/SIMULINK环境下无速度传感器感应电机控制的仿真实验平台,提出了一种仿真研究方法。仿真结果表明,全阶自适应观测器方法在全速范围内具有很好的鲁棒性。

To deal with the unstable problem of the adaptive speed observer using pole-placement technique,a full-order adaptive state observer is created and a speed identification law is proposed based on the observer. By using the Lyapunov stability theory,the gain matrix of the observer is obtained by solving two bilinear matrix inequalities in Mat lab LMI tool box. The simulation scheme of speed control for a sensor less induction motor using direct torque control is built in the Matlab6.5/Simulink. Simulation results indicate that the proposed observer has robust less feasibility of the scheme.