双重化继电保护系统可靠性分析方法研究  

A reliability analysis method of dual-redundant relay protection systems

作　　者：王幸主 文明浩[1] 李嘉琪 陈永昕 WANG Xingzhu;WEN Minghao;LI Jiaqi;CHEN Yongxin(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,China;State Grid Hubei Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北武汉430074 [2]国网湖北省电力公司电力科学研究院,湖北武汉430074

出　　处：《电力系统保护与控制》2024年第17期168-176,共9页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52277103)。

摘　　要：忽略共因失效和隐性失效导致现有双重化保护系统可靠性研究得到的系统拒动频率与电网统计数据偏差较大。为此,提出了一种双重化继电保护系统可靠性评估方法。首先采用可靠性框图和状态空间相结合的方法建立双重化保护系统的可靠性模型,模型计及了双重化保护系统的共因失效、可修复性以及隐性失效等因素。然后提出适用于单个多状态二次设备和共因失效二次设备组的时序Monte-Carlo法,采用该方法求解可靠性模型获得双重化保护系统拒动概率和拒动频率。算例分析结果表明计及共因失效和隐性失效情况下得到的双重化保护系统拒动频率与电网统计数据较为相符,共因失效会显著减少保护系统双重化配置在可靠性方面带来的优势,提高二次设备的自检性能可以显著提高保护系统的可靠性。Existing study on the reliability of dual-redundant protection systems without accounting for common cause failures and hidden failures leads to a large deviation of fail-to-trip frequency from the power grid statistics.Thus,a method for assessing the reliability of a dual-redundant protection system is proposed.First,a reliability model of the protection system is developed using a combination of a reliability block diagram and state-space approach.This takes into account the common cause failures,repairability and hidden failures of the protection system.Then,a sequential Monte-Carlo method applicable to a single multi-state secondary equipment and common cause failure secondary equipment groups is proposed.This is used to analyze the reliability model to obtain the fail-to-trip probability and frequency of the protection system.The case analysis results show that the fail-to-trip frequency obtained by considering the common cause failure and hidden failure is more in line with the statistics,and that common cause failure significantly reduces the reliability benefits from the dual-redundant configuration of the protection system,while improving the self-checking performance of the secondary equipment can significantly improve the reliability of the protection system.

关 键 词：继电保护系统 可靠性 共因失效 隐性失效 状态持续时间抽样 

分 类 号：TM77[电气工程—电力系统及自动化]