带通滤波器法电压积分型定子磁链观测器

Voltage integral model for stator flux estimator based on band-pass filter

针对定子磁链观测的低通滤波器法电压积分模型受电压电流零漂,积分初值和定子电阻误差的影响,使得观测结果存在直流偏置的问题,提出了能消除直流偏置的带通滤波器法电压积分模型。针对电压积分型定子磁链观测器基本模型进行了误差分析,建立了带通滤波器法定子磁链观测器模型,分析了带通滤波器法定子磁链观测器能够消除直流偏置的原理,并给出了幅值和相位的误差补偿方法。对带通滤波器法定子磁链观测器进行仿真和实验表明:带通滤波器法定子磁链观测器解决了低通滤波器法中的直流偏置问题,消除了观测结果的直流偏置,对观测结果进行幅值和相位误差补偿后,观测的定子磁链与参考磁链波形一致。

For the problem that the estimation of magnetic flux of stator has direct current （DC） off- set because the low pass filters（LPF） of voltage integral model was affected by the zero drift of voltage and current, the integral initial value and stator resistance error, band pass filters（BPF） of voltage integral model was proposed, which eliminated the DC offset. Aiming at the basic voltage integral model of stator flux estimator, error analysis was studied, and then BPF of voltage integral model was built. Whereafter the theory why BPF of stator flux estimator eliminated DC offset was researched, and error compensation of amplitude and phase were given. Simulation and experiment results for BPF of stator flux estimator demonstrate that BPF of stator flux estimator solved the problem of DC offset in LPF, eliminating DC off- set, and after error compensation of amplitude and phase are made, the waveforms of estimated magnetic flux and referenced magnetic flux coincide.