直接转矩控制中一种新的磁链估算方法

A New Method of Flux Estimation in DTC

对于永磁同步电机直接转矩控制系统,传统的定子磁链估计方法是采用电压积分法,但该方法容易出现积分饱和,且定子磁链易受定子电阻的影响。为了提高定子磁链估算的精度,提出了利用自适应全维观测器的方法来估算定子磁链。在全维观测器模型的基础上采用自适应算法估算定子电阻,进而提高定子磁链的实际观测性能。仿真结果表明该方法和电压积分法相比明显地提高了定子磁链观测的准确度,有效地减小了转速波动,提高了系统的动静态性能。

The traditional stator flux estimation method using the voltage integration model for permanent magnet synchronous motors of direct torque control system, but the disadvantages were stator resistance influencing observer value and integration saturation. In order to improve the stator flux estimation accuracy, a new method with stator adaptive full order observer to estimate flux was proposed in this paper. The method of a full order observer model introduced adaptive method to improve the performance of actual observer flux. The simulation results showed that compared with the voltage integration model, the new method significantly improved the stator flux observation accuracy, reduced the speed fluctuation and improved the system of static and dynamic performance.