基于MRAS的转子时间常数辨识方法的参数敏感性分析

Parameter Sensitivity Analysis of Rotor Time Constant Identification Based on MRAS

在对感应电机转子时间常数辨识的众多方法中,基于模型参考自适应(MRAS)的辨识方法以其运算简便而吸引了学者们的注意。然而这种方法依赖于电机稳态模型,如果模型中的电机参数与实际值间出现偏差,将会对辨识效果产生影响,使得整个系统的控制性能下降。选取d轴电压和无功功率两种最常见的参考模型来构建自适应控制器,分别就电机模型参数失调对转子时间常数辨识的影响进行了详细的理论分析,指出了基于这两种模型的辨识偏差对不同参数的敏感性,并在Matlab/Simulink下进行了大量仿真,验证了分析的正确性,具有实用参考价值。

In the various schemes for on-line identification of rotor time constant, the model reference adaptive system（MRAS） method has attracted the most of interest for its simple computation. However this approach depends on the motor steady-state model, a mismatch of the parameter between model and motor has strong influence on the identification result and therefore degrade the control performance. Two most commonly used reference models, d-axis voltage and reactive power, were selected to construct the adaptive controllers, the influence of parameter mismatch against rotor time constant identification result was analyzed theoretically, different parameter sensitivities of identification result in both d-axis voltage model and reactive power model based MRAS were then pointed out, and verified through a number of simulation in Matlab/Simulink, which are considered useful in practical application.