基于等价补偿ESO的定子电阻扰动估计方法研究

借鉴滑模控制设计中的等价控制设计思想,同时引入不连续投影算子对标准扩张状态观测器(ESO)加以修正,提出了采用等价补偿ESO进行定子电阻扰动估计的方法,缩小了观测器中汇总不确定性的范围。据此设计了闭环磁链观测器,将定子电流检测信号中由定子电阻变化引起的扰动分离出来,采用等价补偿ESO进行估计并补偿到磁链观测值中,从而消除定子电阻估计误差的影响。还分析了该观测器对定子电阻估计误差的敏感性,结果表明这种观测器在全速度范围内对定子电阻具有较好的鲁棒性。

Research of Stator Resistance Perturbation Estimation Methods Based on Equivalent Compensation ESO

The equivalent control method in sliding-mode control and discontinuous projection modification were incorporated to improve common ESO.The method of stator resistance perturbation estimation was given with equivalent-compensation type extended state observer(ECESO),which reduced the lumped uncertainty in flux observation.Furthermore,a closed-loop flux observer based on ECESO was proposed to reject the disturbance due to stator resistance variation in stator current measurement.The ECESO was used to estimate and compensate the flux observation to eliminate the affect of stator resistance perturbation estimation.Analysis on its sensitivity to stator resistance is also established.Results show that good robustness to stator resistance variation can be achieved in full speed range.