跟踪-微分器在感应电动机定子磁链估计中的应用

针对传统微分器的噪声放大问题及低通滤波器代替纯积分器带来的固有误差问题，对跟踪－微分器在感应电动机定子磁链估计中的应用进行研究。首先，引入跟踪－微分器对检测的定子电流进行了预处理来抑制噪声，再利用跟踪—微分器提取定子电流角频率信息。在此基础上，进一步提出一种利用定子电流角频率信息进行增益及相位补偿的可编程级联低通滤波器代替纯积分器的定子磁链估计方案。仿真与试验结果验证了改进方案的实用性和优越性。

Application of Tracking-differentiator on Stator Flux Estimation for Induction Motor

In view of the noise magnification problem of the classic differentiator and the inherent error problem of low-pass filter, research on the application of tracking-differentiator (TD) in the stator flux estimate is made. Firstly, TD is brought in to pretreat the detected stator current in a bid to suppress noise, and then TD is used to extract the angular frequency information of stator current. On this basis, a programmable 3-stage cascaded LPF based stator flux estimation scheme is presented, in which the stator flux altitude and phase are compensated by optimizing the time constant and the gain constant of 3-stage cascaded LPF by stator current angular frequency. The simulation and experiment results verify the validity and superiority of the proposed scheme.