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Comparison of turbine-generator shaft torsional response predicted by frequency domain and time domain methods following worst-case supply system events

机译:在最坏情况下的供应系统事件之后通过频域和时域方法预测的涡轮发电机轴扭转响应的比较

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The paper examines precision of predicting time response for torque in turbogenerator exciter shafts by frequency-domain analysis following incidence and clearance of short-circuits etc on the electrical supply system. The analysis is based on Fourier analysis of generator air gap torque following incidence and clearance of a supply network disturbance or following worst-case mal-synchronisation to obtain torque excitation which acts on the generator rotor corresponding to each modal vibration. Amplitude and phase of each vibration is thereby determined. Using appropriate damping, time responses for shaft torque at each shaft cell is constructed by summing components which correspond to each frequency of modal vibration of the shaft. These time responses are compared with those obtained by solution of more than 50 differential equations which simulate the shaft train, turbine, generator, exciter, electrical supply system, the fault clearing process, the turbine governor, and the generator excitation system.
机译:本文通过对频域分析,跟随供电系统短路的发生和清除等进行频域分析,检验预测涡轮发电机励磁机轴转矩响应时间的精度。该分析基于发电机气隙转矩的傅里叶分析,该误差在供应网络扰动的发生和清除之后或在最坏情况下的不同步之后进行,以获得与每种模态振动相对应的作用在发电机转子上的转矩激励。由此确定每个振动的振幅和相位。使用适当的阻尼,通过求和与轴的模态振动的每个频率相对应的分量,来构造每个轴单元处的轴转矩的时间响应。将这些时间响应与通过求解50多个微分方程得到的响应进行比较,这些微分方程模拟了轴系,涡轮机,发电机,励磁机,供电系统,故障排除过程,涡轮调节器和发电机励磁系统。

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