基于改进电压模型的感应电机低速发电运行稳定性研究

Studies on Regenerating-mode Stabilization of Induction Motors Based on Improved Voltage Model

感应电机无速度传感器驱动系统低速发电运行时稳定性较差,原因在于低速发电模式下经常出现不稳定现象。在改进电压模型的基础上,分析了低速发电不稳定现象的原因,提出了一种模型参数不准确情况下避免系统不稳定的方法。根据定子角频率和转矩电流分量的符号,改变磁链估计模型定子电阻大小,从而保证电机低速发电稳定运行。仿真和实验结果验证了提出方法的正确性和可行性。

Low-speed regenerating mode of induction motors with sensorless drives is poor in stability,as there often appears unstable phenomenon in this mode.Based on the improved voltage model,the mechanisms behind the low-speed instability phenomena in regenerating mode were explored and methods for avoiding instability with inaccurate model parameters were developed.In order to remedy the instability phenomena,a method of changing the stator resistance according to the signs of the electrical stator speed and the torque current component was also researched.The correctness and validity of the proposed method were verified by simulation and experiment results.