异步电动机定子磁链与电磁转矩的逆系统解耦控制方法

Stator Flux and Torque Decoupling Control of Induction Motor Using Inverse System Method

为了实现脉宽调制电压源型逆变器供电的异步电动机调速系统定子磁链和电磁转矩的动态解耦控制,基于逆系统理论提出了一种新型的解耦控制策略。根据异步电动机调速系统的动态数学模型,证明了其逆系统的存在性,在此基础上得到了逆系统的输入输出方程。把得到的逆系统和异步电动机调速系统相级联,从而将多变量、非线性、强耦合的控制对象解耦成了两个一阶线性子系统,分别称为转矩子系统和磁链子系统,利用线性控制理论对各个调节器进行了设计,实现了定子磁链和电磁转矩对各自参考值的全局渐进跟踪。使用Matlab软件进行了仿真实验,实验结果验证了控制方案的可行性。

In order to implement stator flux and torque deeoupling control of the pulsewidth modulation voltage inverter-fed induction motor drive system, a novel inverse control strategy is proposed based on the inverse system method. Using the dynamic model of the induction motor drive system , the inverse system＇s existence is proved, and the input-output equation of the inverse system is presented. Cascading the inverse system with the induction motor drive system, the drive systems is decoupled into two independent first-order linear subsystems, so as to design the closed-loop linear regulators using linear system theory. The proposed control method guarantees global asymptotic tracking of speed and flux reference signals. The digital simulations have been carried out with Matlab. Simulation results are presented, proving the validity of the inverse system control strategy.