基于全维状态观测器的永磁同步电机无差拍直接转矩控制

永磁同步电机传统的直接转矩控制存在磁链幅值和转矩脉动大的缺点。文中研究了基于状态观测器的无差拍直接转矩控制方案,通过构造全维状态观测器的方法来观测定子磁链幅值,消除了初始磁链误差以及电机参数对传统的观测方法影响的问题。此外针对传统控制系统产生的时滞现象,文中的研究提前一个周期计算出所需的电压矢量,实现了转矩和磁链无差拍控制。仿真结果表明,所提出的基于全维状态观测器的无差拍控制能较好地抑制磁链和转矩脉动,具有良好的控制性能。

Deadbeat Direct Torque Control of Permanent Magnet Synchronous Motor Based on Full-Dimensional State Observer

The traditional direct torque control of permanent magnet synchronous motor has the disadvantages of large flux amplitude and torque ripple. This thesis proposes a scheme of no-beat direct torque control based on state observer. The scheme can eliminate the problem of the initial flux linkage error and the influence of the motor parameters on the traditional observation method by constructing a full-dimensional state observer to observe the amplitude of the stator flux linkage. In addition, for the real lag phenomenon generated by the traditional control system, the thesis proposes to calculate the required voltage vector one cycle ahead of time, realising the deadbeat control of Torque and flux linkage. The results showed that the proposed dead-beat control based on full-dimensional state observer can suppress the flux linkage and torque ripple better and has good control performance.