一种消除非线性因素的电机参数辨识方法

A Identification Method of Eliminating Nonlinear Factors of Motor Parameter

针对电压型逆变器因电机参数不准确而导致控制性能下降的问题,该文提出了一种离线辨识电机参数的方法。该文结合异步电机静止下的数学模型,采用静止测量和旋转测量方法来辨识电机参数,并考虑死区效应、涡流效应、集肤效应等因素,消除了测量过程中的非线性因素影响。其中静止测量可以较为准确的测出电机定子电阻、转子电阻、漏感、励磁电感和额定励磁电流;旋转测量校正了励磁电感和额定励磁电流。相关算法在7.5 k W和160 k W感应电机变频调速系统上进行了实验验证,结果证明该方法能较为准确的得到电机相关参数。

According to the problem that inaccurate motor parameters will lead to control performance of the voltage source inverter degradation, this paper proposed an off-line identification method of motor parameters. In this paper, based on the static mathematics model of induction motor, static and rotational measurement method was used to identify the motor parameters, and considering the dead-time effect and skin effect, eddy current effect, eliminates the nonlinear factors in the process of measurement. The static measurement can accurately measure the motor stator and rotor resistance, leakage inductance, inductance and the rated excitation current; rotation measurement can be used for correcting the magnetizing induct- ance and the rated excitation current. The proposed algorithm was verified in 7.5 kW and 160 kW induction motor variable frequency speed regulating system, the results show that this method can get more accu- rate motor parameters.