基于拟合方法的N-1静态电压稳定裕度计算  

N-1 steady-state voltage margin calculation based on fitting computation method

作　　者：张小兵[1] 吴政球[1] 李连伟[1] 钟浩[1] 葛建伟[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力系统保护与控制》2010年第14期23-27,共5页Power System Protection and Control

摘　　要：提出一种兼顾精度与速度的计算线路N-1故障下静态电压稳定临界点的拟合方法。该方法用左特征向量排队找出较严重故障,再利用泰勒级数求得电压崩溃点处状态变量和负荷裕度对严重故障支路连接参数的1～3阶灵敏度,在此基础上用四参数拟合方法进行逼近,从而快速精确地求解出关键线路故障情况下电压稳定临界点。该方法能快速地对线路故障按严重程度进行排序,并精确得出故障后电压稳定裕度,可用于调度中心作监控估算工具。IEEE30及IEEE57母线系统上的算例验证了该方法。This paper proposes a fitting method to calculate the critical point of static voltage under branch outage contingency.Firstly,it ranks the branches using left vector.Secondly,it obtains the 1 to 3 degree derivatives of load parameter and state variables by Taylor’s series expansion under base network topology.At last,the load margin could be quickly and exactly calculated by the 4-parameter fitting.As it could rank the contingency branches and get the exact load margin after branch outage,dispatching center can use it as an estimation tool for steady state voltage.IEEE-30 and IEEE-57 bus systems verify this technique.

关 键 词：静态电压稳定 N-1故障 灵敏度分析 曲线拟合 故障排序 

分 类 号：TM712[电气工程—电力系统及自动化]