转子绝对动能增量及其在失稳模式判别中的应用  

Absolute kinetic energy increment of the generator rotor for distinguishing unstable modes

作　　者：闵勇[1] 李函[1] 林姿峰[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《清华大学学报（自然科学版）》2003年第9期1161-1164,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(G1998020309)

摘　　要：研究了大扰动下复杂电力系统失稳模式的判别指标。针对暂态能量函数法使用的势能概念在物理意义上的疑问,从发电机原始转子运动方程和经典转子运动方程出发,讨论了转子不平衡功率对时间积分的物理意义,分析了它们同暂态稳定分析中使用的势能概念的关系,在此基础上提出了相对动能和绝对动能的概念。根据发电机绝对动能增量大的机组最有可能率先失步的事实,提出了以绝对动能增量为指标进行电力系统失稳模式判别的方法,并通过对实际系统的仿真计算验证了方法的可行性。A discrimination index was developed for the unstable modes of complex power system experiencing large disturbances. The swing equation of the generator rotor was used to analyze the physical significance of the integral of the unbalanced rotor power and its relation to the potential energy for transient stability. The analysis was used to define the absolute kinetic energy and relative kinetic energy of generator rotors. Since a generator with large absolute kinetic energy increment is more likely to loss synchronization, an algorithm was developed based on the absolute kinetic energy increment to distinguish the unstable modes. Simulation results for actual power systems verify the accuracy of the algorithm.

关 键 词：电力系统 失稳模式 暂态稳定控制 转子 绝对动能增量 暂态能量函数法 势能 

分 类 号：TM712[电气工程—电力系统及自动化]