基于改进静止频率响应试验的同步电机参数辨识

Parameter identification of the synchronous machine based on an improved standstill frequency response test

针对同步电机参数辨识问题,以全电流为状态变量,研究同步电机d、q轴磁链与定子电流及励磁电压的关系,建立电机的数学模型。通过分析静止频率响应试验曲线,获得不同频率下各测试参数的增益和相位,替换d、q轴电磁参数特性传递函数方程中的相关部分,简化电机数学模型及其状态空间方程。基于励磁和定子回路开路时电机状态的分析结果,改进数据处理过程,辨识电机参数,对比采用其它方法测取的结果,有较好的一致性,所提参数辨识方法的有效性得以验证。

In order to identify the parameters of the synchronous machine, the relationship of the d, q-axis flux link- age with stator current and excitation voltage was studied, and a model of the synchronous machine was built with cur- rent as state variables. By analyzing the standstill frequency response curves, the gain and phase of different parame- ters with various frequencies were obtained so as to replace the relevant parts in the characteristic transfer function e- quations which represented the d, q-axis electromagnetic parameters. The mathematic model and the state-space equa- tions of the synchronous machine were simplified. The data processing method was improved and the parameters of the machine were identified based on the status analysis results of the machine at the open field excitation winding and the open stator winding. The parameters had better consistency than the measured parameters with other test methods, and therefore the effectiveness of the proposed parameter identification method was verified.