用二次曲面方法求解多机系统故障临界清除时间  

Critical fault clearing time of multi-machine systems with the quadratic surface method

作　　者：闵勇[1] 李函[1] 柳勇军[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）》2004年第4期454-457,461,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究基金项目(G1998020309)

摘　　要：为提高多机系统故障临界切除时间的求解精度和保证确定的误差方向,该文在主导不稳定平衡点处利用空间二次曲面来近似局部稳定域边界,根据持续故障轨线与空间二次曲面的交点来确定系统的故障临界清除时间。仿真结果表明,该方法具有固定的误差方向和较高的计算精度,误差基本能控制在10%以内,能够对系统的故障严重程度进行排序。另外,在网络中发生故障时计算性能可能没有切平面方法好,这方面的理论根据还需进一步的研究和探索。The quadratic surface method was used to approximately approaches to the boundary of the partial stability region for the control of the unstable equilibrium point of multi-machine systems to enhance the calculation precision and ensure the error direction. The fault critical clearing time was determined by the crossing point of the quadratic surface with the continuous fault trajectory. Simulation results show that the quadratic surface method has a fixed error direction and better precision with most fixed errors being less than 10%. Therefore, the system fault severities can be ranked. However, the quadratic surface method may not be better than the tangential plane method for interior network faults so further research is needed to improve the quadratic surface method.

关 键 词：二次曲面方法 多机系统 系统故障 临界清除时间 电力系统 主导不稳定平衡点 

分 类 号：TM712[电气工程—电力系统及自动化]