感应电机参数的离线辨识

Off-line Identification of Induction Motor Parameters

提出了一种基于SVPWM的感应参数离线辨识方法,通过改进的直流实验、堵转实验、空载实验和阶跃电压实验辨识感应电机所有的参数。辨识过程由系统自动完成,无需人工操作,无需速度信息。信号处理使用了离散快速傅立叶变换(DFFT)和最小二乘法,准确地提取了有效信息,提高了辨识精度。实验结果证明了上述方法是正确可靠的,且保证了较高的辨识精度。

An off-line identification method of induction motor （IM） parameters is presented in this paper. Before startup, the inverter drive automatically performs the modified DC test, locked-rotor test, no-load test and step-voltage test. No speed signals are required in this approach. In order to obtain the effective message in these tests, the discrete fast fourier transform （DFFT） and the least-squares are used to process the signals of currents and voltages. The validity, reliability and accuracy of the presented methods are verified by the experiments on a VSI-fed IM drive system.