一种改进的直接转矩控制系统定子磁链观测方法

传统的直接转矩控制系统的定子磁链电压-电流（u—i）观测模型存在低速性能差和直流偏置误差的问题，影响了系统的控制效果。现提出了一种新型的直接转矩控制系统的定子磁链观测模型，采用一阶低通滤波器替换u-i模型中的纯积分环节，并引入PI闭环校正环节来补偿磁链观测的直流偏置误差。实验表明，该磁链观测器精度高，对电机参数的鲁棒性好，并能够有效地解决直流偏移误差问题。

A Modified Stator Flux Observer of DTC Control System

Conventional stator flux observer u-i model has the limitations of poor performance of low speed region and DC drift error, which weaken the control performance of DTC. A novel stator flux observer model of DTC control system, the model substitutes one order low-pass filter for pure integration unit and adopts PI close-loop calibration unit to compensate the DC drift error of stator flux observer were introduced. The experiments show that it improves accuracy of flux observation, heightens robustness for motor parameters and eliminates DC drift error.