带有转子电阻补偿的异步电机电流型磁链观测器

提出了一种改进的异步电机转子磁链电流型观测器。造成电流型观测器估计误差的转子电阻不确定项,在定子电流方程中同样存在。把它扩张成新的状态变量后,根据扩张状态观测器(ESO)的原理,在电流、转速可测的条件下可以对其进行观测。把所得的对不确定项的估计值引入电流型观测器,则可以消除转子电阻的影响。与传统观测器的仿真对比结果表明,该方法对转子电阻的变化具有很强的鲁棒性。

New Current-model Flux Observer for Induction Motor with Rotor Resistance Compensation

Rotor flux estimation using the current model observer is highly sensitive to the rotor resistance.This paper presents an improved current model rotor flux observer with rotor resistance compensation.The uncertain term derived from rotor resistance,that produces the estimation error,appears in both the stator current equation and rotor flux equation.This one is extended to a new state variable.By extended state observer theory,the uncertain term converges to its actual value with known current and speed information.By introducing the estimation of uncertain term,the new current model flux observer is insensitive to the rotor resistance.Simulation results under high and low speed show that the proposed method achieves the correct estimation of the rotor flux with the robustness against the rotor resistance variation.