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文章介绍了华北电网在大同二电厂进行机组参数在线测试情况，比较了Eq’恒定简化模型与发电机、励磁机、原动机调速器用实测参数。采用BPA详细模型仿真结果；分析比较了两种模型算出的联络线送电极限值；对实测出的大同二电厂机组励磁系统不足提出了改进建议，并对励磁系统参数进行了分析研究。
This paper introduces the on - line test of unit parameters of Datong No.2 power plant in North China Power Grid. The Eq ’simplified model and the measured parameters of generator, exciter and prime mover governor are compared. BPA model was used to simulate the results of the model. The limit values of the tie lines calculated by the two models were compared and analyzed. Some suggestions for improving the excitation system of Datong II power plant were put forward, and the parameters of the excitation system were analyzed.