基于改进型积分器的永磁同步电机直接转矩控制

Direct Torque Control of Permanent Magnet Synchronous Machines Based on Modified Integrator

将改进型积分器用于永磁同步电机的定子磁链观测环节,目的在于解决纯积分器存在直流偏移的缺陷。对于系统不同的给定值,固定的截止频率导致改进型积分器的磁链幅值和最佳限幅值不恒定,针对这一缺点本文提出了根据永磁同步电机状态方程来获得磁链比较环节的定子磁链给定值,从而提高了系统的性能,使系统不再受外界给定值的影响。

This paper presents a new direct torque control (DTC) scheme for permanent magnet synchronous machine (PMSM) based on modified integrator with an amplitude limiter, which is used to overcome the shortage of dc drift caused by using pure integrator. In practice, it is difficult to set the proper stator flux given value and limited amplitude for the modified integrator when given value changed. So a new stator flux observer based on the stator equations of the permanent magnet synchronous is proposed and is used as the input of the stator flux compare unit with the modified integrator reserved as the sector decision. Good performance has been achieved by simulation.