考虑相关故障的双回输电线路可靠性评估  

Reliability evaluation of two parallel transmission lines with respect to relevant fault

作　　者：任震[1] 梁振升[1] 黄雯莹[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《电力自动化设备》2005年第6期14-17,共4页Electric Power Automation Equipment

基　　金：国家自然科学基金重点资助项目(50337010)~~

摘　　要：电力负荷需求不断增加使得原有输电系统可能出现过负荷现象。特别是双回平行输电线路,当其中一回线路发生故障退出而另外一回线路仍然运行时,该回线路发生过负荷的概率就会增大,甚至引起相关故障。为了考虑线路过负荷情况下双回平行输电线路的可靠性,提出应用马尔可夫随机过程建立双回平行输电线路考虑相关故障时的可靠性等效模型及其状态空间图,根据该状态空间图计算出考虑相关故障的双回平行输电线路的可靠性指标。利用算例分析了考虑相关故障时双回平行输电线路在可能的相对频率下可靠性,并与传统的双回输电线路四状态可靠性模型的可靠性指标比较。结果验证了所提可靠性等效模型的实用性和有效性,并指出输电线路过负荷运行引起相关故障对输电系统可靠性有较大影响。The increase of power supply demand makes the transmission system overload possible,especially that of two parallel transmission lines. When one line is in outage,the other may happen overload with greater possibility,which may cause relevant fault. A reliability equivalent model of two parallel transmission lines with respect to relevant fault and its state-space diagram are presented for it by using the theory of Markov process. The reliability indices can be calculated according to the state-space diagram. Case study calculates the reliability under possible relative frequency of overload and compares it with the results by the conventional 4-state two-transmission-line reliability model,which shows that the reliability equivalent model is practical and effective,and that the relevant fault caused by transmission line overload has greater impact on transmission system reliability.

关 键 词：电力系统 可靠性评估 双回输电线路 相关故障 

分 类 号：TM726[电气工程—电力系统及自动化] TM732