参数自校正异步电机状态观测器设计

Design of Asynchronous Induction Motor State Observer with Function of Parameters Auto-adapting

异步电机在运行中定子、转子电阻温升现象明显。仿真分析发现无参数校正状态观测器观测值与实际值偏差很大,不能用于对电机的精确控制。为此通过理论推导,得出了异步电机参数在线辨识方法,并用于修正状态观测器模型。仿真结果表明,参数辨识模型能较好地跟踪电机参数的变化,设计的观测器能较快地消除初始状态偏差、扰动误差及由于参数不准确产生的计算偏差。

The variation of asynchronous induction motor stator and rotor resistance caused by the floating temperature is phenomenal. The stimulation results show that the error between the observed value of non-adaptive state observer and the real one is big, and it can not be used to control the motor accurately. So the online parameters identification method is found through the theoretical deduction and it is used to rectify the state observer parameters. The simulation results show that the parameters identification models can follow the varying parameters closely and the designed observer can eliminate the errors caused by the initial conditions, the outside disturbance and the inaccurate parameters rapidly.