基于改进电气介数的关键线路辨识  

Identification of Key Lines Based on Improved Electric Betweenness

作　　者：徐岩[1] 郅静 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2015年第6期24-28,共5页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50777016);中央高校基本科研业务费专项资金资助项目(12MS110)

摘　　要：为提高电力系统运行安全水平,提出一种基于改进电气介数的关键线路辨识方法。推导出线路功率变量与节点注入功率变量之间的功率灵敏度矩阵,以该矩阵为基础,考虑线路负载率、不同节点发电量和负荷水平的影响,定义改进电气介数指标识别电网的关键线路。利用加权潮流分布熵反映线路断开对系统线路负载率分布及运行安全水平的影响。改进电气介数计算简单,克服了以往介数指标假设节点间功率按最短路径传输的不足,同时考虑了线路中潮流的方向性。加权潮流分布熵很好地反映了系统中部分线路负载率偏高甚至过载而导致的潮流分布不均衡。在IEEE39节点系统中对该方法进行验证,结果表明利用改进电气介数可有效识别断开后导致系统线路负载率分布不均衡的关键线路。To improve the operation safety level of the power system,this paper puts forward an identification method of key lines based on improved electric betweenness. According to this identification method,the power sensitivity matrix between line power variable and nodal injection power variable is derived. Then based on the matrix and considering the line load ratio,generating capacity and load level,this paper defines the identified key lines based on the improved electric betweenness. Next,the weighted power distribution entropy is employed to reflect the effect on the load rate distribution and the operation safety level of the line disconnection. It is found that,on one hand,the simple calculation of improved electric betweenness can overcome the shortcomings of the previous betweenness indexes which assume that the power goes through the shortest path between nodes,and on the other hand,it also takes the direction of power into consideration. The weighted power distribution entropy can reflect the uneven distribution of power caused by the high system load rate or even overload. The simulation in the IEEE39 bus system shows that the improved electric betweenness can effectively identify the key lines which lead to line load ratio unbalanced distribution after being disconnected.

关 键 词：电力系统 关键线路 改进电气介数 加权潮流分布熵 

分 类 号：TM711[电气工程—电力系统及自动化]