无速度传感器矢量控制系统转子电阻在线辨识

On-line Identification of Rotor Resistance for Speed Sensorless Vector Control System

三相感应电动机无速度传感器矢量控制系统中,电机参数变化(特别是转子电阻)影响矢量控制性能和速度辨识精度;而稳态下,由于转子磁链是常数,转速和转子电阻不能解耦,两者很难实现同时辨识。基于无速度传感器直接矢量控制系统,设计了独立于全阶状态观测器的积分改进型转子磁链观测器,动态时结合自适应递推最小二乘法对转子电阻进行辨识,系统能够在动态过程中实现对转速和转子电阻的同时辨识,该方法通过了仿真和实验验证。

In the speed sensorless eontrol of the 3-phase induction motor, the machine parameters（especially rotor resistance） have a strong influence on the performance of vector control and precision of the speed estima- tion. In steady-state, it is known that the simultaneous estimation of the rotor speed and rotor resistance is im- possible because the rotor flux is constant and rotor speed and rotor resistance can＇t be decoupled. A method of estimating simultaneously the motor speed and rotor resistance in the transient state based on direct field orien- ted veetor control system without speed sensor was presented,and designed the modified integration of voltage flux observer which has no relationship with full-order observer and adaptive recursive least squares algorithm is used,and it is possible to estimate motor speed and rotor resistanee simultaneously. The validity of the pro- posed method is verified by simulink and experiment.