There are higher requirements of the equipment safety for the large nuclear turbogenerator. It is necessary to consider the more comprehensive and detailed factors to evaluate the shaft torsional oscillations. In order to overcome the limitation of the short circuit equation, it is proposed a single-machine infinite-bus system as the studied system. It is derived that the shaft torsional model of the half-speed nuclear turbogenerator is the same as that of the full-speed turbogenerator in per-unit system. For one 1 100MW half-speed nuclear turbogenerator,the maximum stresses are evaluated in the case of the several typical disturbances. It is shown that the most serious case is the mal-synchronization with 120?angle difference. Therefore,it is suggested to take the generator terminal short circuits together with the mal-synchroniza-tions as the evaluated cases for the half-speed nuclear turbogenerator.%大容量核电机组对设备安全性有更高的要求,进行轴系扭振考核计算时有必要考虑更全面、更复杂的因素.为克服采用短路力矩方程的局限性,提出一个单机无穷大母线系统,作为轴系扭振考核计算的研究系统.经过推导分析,指出在标幺值形式下,核电半速机组轴系扭振模型与全速机组轴系扭振模型是一致的.对一台1100MW核电半速机组在几种典型扰动下的最大扭应力进行计算和比较,发现120°误同期合闸激发的扭振情况最严重.因此,建议把误同期合闸和机端短路一起作为核电半速机组轴系扭振考核计算的工况.
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