电流滞环控制PWM逆变器异步电动机的非线性解耦控制系统

本文针对电流滞环控制PWM逆变器异步电动机系统这一非线性、多变量、强耦合的控 制对象,采用非线性变换和非线性反馈,实现了系统的动态解耦和全局线性化.其中关键问 题是对合性条件的满足,从而分解成线性化的转速子系统和转子磁链子系统,两个子系统的 调节器可按古典线性理论设计.最后,用8096十六位单片机实现非线性解耦控制算法,组成 了交流变频调速系统,并给出实验结果.

Nonlinear Decoupling Control of Hysteresisband Current-Controlled Induction Motor Drive Fed by Pwm Inverter

The dynamical model of induction motor fed by hysteresis-band currentcontrolled PWM inverter is a nonlinear multivariable system with strong coupling. In this paper, the theory of feedback linearization for nonlinear systems is applied to realize linearized decoupling control for such a motor. for this controlled object, In this case the key problem is to satisfy involutive condition, Considering time deley of hysteresis band, a set of fifth-order nonlinear state equations which satisfies the involutive condition of feedback linearization is obtained, so that the lineariztaion and dynamical decoupling of rotor speed and rotor flux linkage systems are fulfilled, The regul ators of these two linear subsystems can be designed with classical linear theory, Final ly, an AC variable frequency speed-regulating system is formed with the nonlinear decoupling algorithm realized in 8096 single-chip microcomputer, Experimental results of the system are presented.