异步电动机直接转矩控制中高性能磁链观测器研究

磁链观测是实现高性能电机传动系统的关键环节,为解决传统直接转矩控制系统中定子磁链观测方法的局限性,设计了高性能全阶磁链观测器实现了定子磁链在全速度范围,尤其在极低速时的准确观测。仿真和实验结果表明:此方案对定子磁链的观测效果明显优于传统的观测方法,降低了稳态时转矩、磁链和速度的波动,并对电机参数的变化具有良好的鲁棒性。

Research of High Performance Flux Observer for Direct Torque Control of Asynchronous Motor

The key to the high performance motor drive system was flux observation.For solving the limitation in stator flux estimation by the classical direct torque control(DTC),a high performance full order flux observer has been designed,which accurate observation of stator flux has been realized in a wide speed range,especially in extremely low speed.The simulation and experimental results showed that this scheme gived an obviously advantage over the classical methods in stator flux estimation,the torque,current and speed pulsation have been reduced during steady state,and demonstrated higher robustness to motor parameters variation.