一种考虑变电站内部的电力系统可靠性分析  

Power system reliability analysis considering substation interior

作　　者：陈晨[1] 刘俊勇[1] 刘友波[1] 蒋长江[1] 苟竞[1] 刘若凡[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《电力自动化设备》2015年第2期103-109,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51261130472)~~

摘　　要：将变电站视为等值节点的传统可靠性分析方法忽略了变电站内部结构对系统的影响。将系统划分成设备层、变电站层、主网层,利用蒙特卡洛方法进行分层抽样;通过马尔科夫状态空间方程和隐性故障模型计算站内设备和保护功能组状态概率,并对其进行抽样;采用基于邻接矩阵的最小割集算法求得变电站预想事故集,并与抽样结果进行对比,生成变电站停运线路集,将其合并到电网抽样结果中,计算系统可靠性指标。通过修改的RTS测试系统对终端变供电网络进行仿真校验。结果表明,所提方法实现了继电保护失效影响下变电站内部结构和设备停运对系统可靠性影响的定量分析。Traditional reliability analysis method takes substation as an equivalent node,ignoring the impact of substation interior on system. An improved reliability analysis method is proposed,which divides the power grid into three layers,i.e. equipment,substation and system,applies Monte Carlo method to sample each layer,adopts the Markov state space equations and the hidden failure model to calculate and sample the state probabilities of substation equipment and protection functional groups,takes the minimum cut set algorithm based on the adjacency matrix to calculate the expected accident set of substation,compares the accident set with the results of substation sampling to form the substation outage line set,and integrates the line set into the results of grid sampling to calculate the system reliability index. Simulative verification is carried out with the modified RTS test system for a terminal substation,and results show that,the proposed method quantitatively analyzes the impact of substation interior structure and equipment outage on system reliability under relay protection failure.

关 键 词：电力系统 可靠性 变电站 继电保护 保护失效 分层抽样 蒙特卡洛方法 马尔科夫模型 

分 类 号：TM711[电气工程—电力系统及自动化]