【摘要】 电气操作特别是电气多次操作引起的发电机轴系扭振 ,严重地影响了发电厂的安全运行 ,该文使用轴系分段质量块模型中状态变量 ωI 和θi 构造了表征轴系扭振强弱的轴系全局能量函数 ,并在此基础上 ,构造了等值为两轴段扭振强度的等值能量函数 ,有利于分析严重受扰轴段扭振的幅值包络线。最后以重合闸操作为例 ,揭示了多次电气操作引起基金项目 :国家自然科学基金资助项目 (5 96 770 12 ) ;教育部博士学科点基金资助项目 (970 6 980 7)。ProjectsupportedbyNationalNaturalScienceFoundationofChina(5 96 770 12 ) .的轴系扭矩是因为在轴系振动期间又叠加了新的冲击 ,它可能会加剧或减弱原有的扭振强度 ,其影响取决于新冲击的大小和施加时刻 ,选择合适的时刻完成最后一次电气操作 ,不仅不会加剧扭振反而会减弱原有的扭振更多还原

【Abstract】 Turbine generator shaft torsional oscillation caused by electrical operations,especially multiple operations,affects the security of the power station.Some studies based time domain simulation methods have been reported,but a mathematical model which can deal with the mechanism of torsional oscillation has not been established.In this paper,the shaft globe energy function is constructed using state variables to indicate the magnitude of shaft torsional oscillation.The value of the energy function at the time of performing the last operation is proportional to the torsional oscillation intensity.This value varies continuously and periodically,and is determined by the disturbance torque and the instant of performing the last operation.A shaft partial energy function for a two\|section equivalent model of the shaft system is also constructed to analyzed the torsional oscillation amplitude of the most seriously disturbed shaft section.Finally,the auto\|reclosure is taken as an example to demonstrate the electrical operations’ impacts on shaft torsional oscillation.The electrical operation results in new disturbance in the system,it may enlarge or reduce the oscillation,depending on the magnitude and the applying time of the new disturbance.It is shown that the shaft torsional oscillation can be reduced if the time of the last electrical operation is chosen appropriately.更多还原