基于直接转矩控制的定子磁链及速度辨识的研究

The Research of Stator Flux and Speed Estimation Based Direct Torque Control

提出一种高性能的定子磁链观测方法,用一阶低通滤波器替换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中的直流偏置误差,提高了定子磁链观测器的性能。在速度辩识时,将坐标系建立在旋转的定子电流矢量上并同步旋转,求解过程中未使用含定子电阻的积分器,从而避免了积分误差对精度的影响。仿真结果表明,直接转矩控制中的定子磁链和速度辩识性能有了较大的提高。

A new method of stator flux observe is mentioned, 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, the performance of the stator flux observer is improved. When estimating the speed, fix the reference frame on the stator current vector and rotate synchronously. The equation doesn＇t use integrator including stator resistance, the influences on flux estimation accuracy caused by integrator error, are avoid. The simulation results display that the performance of stator flux observer and the speed estimation in the DTC are improved.