基于直接反馈线性化的异步电动机非线性控制

NONLINEAR CONTROL OF INDUCTION MOTORS BASED ON DIRECT FEEDBACK LINEARIZATION

异步电动机是一个存在复杂耦合的非线性系统。该文应用直接反馈线性化理论,通过对输出方程的简单求导,得到所需的坐标变换和非线性状态反馈,实现了异步电动机系统的输入输出线性化。对于反馈线性化中重要的零动态问题进行了详细研究,保证了控制系统的稳定性。同时,系统分解成转速和磁链两个独立的最简线性子系统,实现了二者的动态完全解耦。仿真结果表明该文提出的方法具有优良的控制性能。

Induction motor is a nonlinear system with significant coupling. This paper applies the direct feedback linearization (DFL) theory. The appropriate coordinate transformation and nonlinear state feedback are obtained through deriving the output equations, with which the induction motor system is input-output linearized. Furthermore, as an essential problem in DFL, the zero dynamics is researched in detail so that the stability of the control system is guaranteed. Simultaneously, the system is decoupled into two independent subsystems, flux and rotor speed, which realizes the completely dynamic decoupling. The simulation results show that the method proposed in this paper has satisfying performances.