低通滤波器观测定子磁链对DTC性能改善研究

Research on improvement of DCT performance using the low-pass filter for stator flux

对传统的直接转矩控制产生的低速时磁链观测不准确对系统的性能影响进行了详细分析。研究了一种在低速下用基于电压模型的异步电机定子磁链观测的低通滤波器设计,该方法通过检测电机定子电流在低速下对滤波器截止频率进行动态调整和补偿,给出了原理框图和实现方法。利用Matlab/Simulink对探讨改进后的系统进行了仿真。仿真结果表明低速性能得到了提高。

The impact on inaccurate observations is analyzed in detail to direct torque control system with having a low speed magnetic flux generated by traditional direct torque control. The low-pass filter for magnetic flux of induction motor stator has been designed based on a voltage model of low speed. The dynamic adjustment and compensation are performed through detecting the low speed cut-off frequency of the filter and its diagram of principle and realization method are presented. Using Matlab/ Simulink to simulate the explored and improved system mentioned above. The simulation results show that low-speed performance has been improved.