摘要
针对电网源发性故障引发大停电事故的安全问题,提出一种基于节点注入功率分析电网连锁故障安全水平的方法。首先,根据继电保护动作特性给出电网连锁故障的判别式;然后,基于电网拓扑结构和运行状态,定义包含支路介数、系统全局效能、加权潮流熵、系统危险性和电压偏移在内的综合脆弱指标,并利用模糊C-均值(fuzzy C-means,FCM)算法选取初始故障;接着,根据节点注入功率定义电网当前运行状态与最近临界状态之间的距离作为电网安全水平指标,构建针对多个初始故障下的安全模型,并结合基于自适应变异的粒子群算法求解模型;最后,以IEEE 39节点系统为例进行仿真验证,结果表明本文所提模型和方法可以有效评估电网当前运行状态受到不同初始故障冲击后的安全水平,为预防连锁故障提供参考。
Aiming at the safety problem of large-scale power outage caused by source failure,this paper proposes a method to analyze safety level of the power grid for cascading failures based on node injection power.Firstly,it gives the discriminant formula for cascading failure of the power grid according to the relay protection action characteristics.Secondly,based on the topology and operation it defines comprehensive vulnerability indicators including branch betweenness,global efficiency of the system,weighted tidal entropy,system hazard and voltage offset,and selects initial failures by using fuzzy C-means(FCM)algorithm.Afterwards,taking the distance between the current operating state of the power grid and the nearest critical state as the safety level indicators according to the node injection power,the paper constructs the safety prediction model for multiple initial failures,and solves the by combining with the particle swarm optimization based on self-adaptive mutation.Finally,the IEEE 39 node system is taken as an example for simulation verification.The results show that the proposed model and method can effectively evaluate the safety level of the current operation state of the power grid after being impacted by different initial failures,and provide references for preventing cascading failures.
作者
罗杰
李晨晨
LUO Jie;LI Chenchen(School of Electronic Electrical and Physics,Fujian University of Technology,Fuzhou,Fujian 350108,China)
出处
《广东电力》
2021年第11期57-66,共10页
Guangdong Electric Power
关键词
大停电事故
连锁故障
脆弱指标
节点注入功率
电网安全水平
power outage accident
cascading failure
vulnerable indicator
node injection power
power grid safety level
