非恒值磁链幅值给定SVM-DTC系统改进磁链观测器

Modified Flux Observer for SVM-DTC System with Inconstant Flux Amplitude Reference

针对非恒值磁链幅值给定的永磁同步电动机基于空间电压矢量调制的直接转矩控制(SVM-DTC)系统,传统的第二类改进型积分器不能对磁链进行准确观测,且电动机输出性能差。提出了一种变限幅的改进型积分器,实现在非恒值磁链幅值给定SVM-DTC系统的磁链准确观测,电动机运行稳定并能提高功率因数。

For permanent magnet synchronous motors direct torque control system based on space vector modulation （SVM-DTC） with inconstant flux amplitude reference, conventional modified integration with constant amplitude limiter could not observe the stator flux accurately, and had bad output performance. A new modified integration with variable am- plitude limiter was proposed to observe the stator flux accurately in the SVM-DTC system with ineonstant flux amplitude reference, it also can improve stability and power factor of the motor.