摘要
矢量控制系统中需要用到的参数较多,能否获得良好的调速性能往往取决于电机参数的准确性。由此,对一种采用离散傅里叶变换的参数辨识方法进行了研究。通过空间电压矢量算法实现相应的电压激励的产生,并注入电机,根据电机等效特性辨识出电机参数。为了提高定子电阻的辨识精度,利用最小二乘法对传统的直流实验进行优化。针对单相交流实验和空载实验中,检测电压和电流信号可能出现的干扰信号,利用离散傅里叶变换的方法以减少误差,实现对电机的电流幅值、电压幅值及其功率因数的测量,进而准确辨识电机定转子电阻、定转子漏感和互感。为了对辨识参数的准确性进行验证,将所辨识参数在异步电机矢量控制系统进行应用。实验结果表明:所辨识的参数具有较高的准确性。本辨识方法模型简单,易于实现,具有广阔的应用前景。
The accuracy of motor parameters affects the quality of the motor control system seriously in high performance AC drives of induction machine. In view of this problem,a kind of parameter identification method was studied based on discrete Fourier transform. Through the space vector PWM algorithm,some form of voltage excitation was imposed to the asynchronous motor. Using the least square method to optimize the traditional DC experiment,the accuracy of identification of stator resistance was improved. The single-phase AC experiment was used to replace the traditional three-phase motor stall experiment. For the single-phase AC experiment and no-load test,interference signal of voltage and current signals may be detected. A kind of method based on discrete Fourier transform was used to reduce the error,then the measurements of the motor voltage,current amplitude and power factor were realized. The accurate identification of the rotor resistance,stator leakage inductance,rotor leakage inductance and the transformer were achieved. The identified parameters were applied in vector control system for asynchronous motors. The test results prove that the parameters obtained in this identification method have high accuracy. The identification method is simple and easy to implement,and has broad application prospects.
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2014年第3期58-63,8,共6页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(51007033)
关键词
离散傅里叶变换
最小二乘法
异步电机
参数辨识
空间电压矢量
discrete fourier transform
least-square method
asynchronous motor
parameters identification
space vector pulse width modulation
