发电机用作变频励磁激振源的分析和研究

The Generator as a Varying Frequency Exciter of Vibration

利用发电机作为激振源和借助于励磁电压与电流附加变频交流分量激发大型汽轮发电机组轴系扭振并实测其固有扭频，是一种较新的测试方法。该文对一台进口２００ＭＷ机组发电机在不同运行工况下作为激振源时变频励磁激振的可行性及其效果进行了分析和计算，所得的结论可为变频励磁激振的实施提供依据。

Abstract With the help of the superposed varying frequency A.C. component of the exciter's voltage and current, the generator may be used in a new way to excite torsional vibration of turbine-generator rotor strings. This paper reports on analysis and calculation results for probing into the feasibility of using the generator as a varying frequency vibration exciter, under various modes of operation, in the case of an imported 200 MW set. The conclusions obtained may be helpful to effectuating varying frequency vibration excitation in practice.