矢量控制系统是异步电动机非线性解耦控制的一类实现

Vector Control System-A Class of Realization of Nonlinear Decoupling Control of Induction Motors

本文首先论述,在任意旋转座标系中,通过非线性变换和非线性反馈,可以把非线性多变量的逆变器—异步电动机系统分解为转速、转子磁链幅值和转子磁链相位三个线性单变量的子系统,从而实现异步电机的解耦控制和精确线性化。经分析后证明,在静止两相座标系(αβο)下,非线性解耦控制就是磁链反馈型矢量控制;而在按磁场定向的旋转两相座标系(MT)下,就是转差型矢量控制。从而表明,矢量控制系统是异步电动机非线性解耦控制的一类实现。

An inverter fed induction motor system with nonlinear multivariable mathematical model repre-sented in rotating coordinates can be separated into three linear single variable subsystems, i. e. rotor speed,magnitude of rotor flux linkage and phase of rotor flux linkage systems, by means of nonlinear transformation of coordinates and nonlinear feedback. Decoupling and exact linearization of induction motor is realized thereby.Analytic results show that nonlinear decoupling control in static 2-phase coordinates is just the vector control system with rotor flux linkage feedback, and that in rotating 2-phase coordinates with field orientation is vector control system of slip frequency type. Therefore, vector control system is a class of realization of nonlinear de-coupling control of induction motors.