摘要
在电网连锁故障分析中,辨识出故障传播过程中的关键脆弱线路具有重要意义。计及电网拓扑结构和实时运行状态2个方面,构建包含电气介数、功率系数、负载率偏移量和电压偏移率在内的指标体系;基于熵权法建立脆弱线路的评估模型,综合有功和无功、局部和全局2方面实现对电网线路脆弱度的全面评价。通过仿真算例对系统的所有线路进行脆弱度排序,结果表明所提指标克服了已有指标无法兼顾电网拓扑结构实时和运行状态的缺陷,评估模型实际有效。
To study the mechanism of cascading failures in power grid, it is of great significance to identify the key vulnerable lines in propagating cascading failures, The index system that contains electric betweenness, power flow coefficient, load rate deviation and voltage deviation is proposed considering the network structure and real-time running state of the system. A vulnerable line identification model is built based on entropy weight method. The aspect of active power and reactive power using global and local indexes are synthesized to assess the vulnerability of transmission branches. All the circuits of the system are sorted for vulnerability through simulation calculation. It is shown that the proposed indicators can overcome the deficiency of existing indicators that can not take into account the grid topological structure and real-time running state concurrently. The simulation proves the feasibility of assessment model.
作者
曾磊磊
曾鑫
吕嘉
ZENG LeileiI;ZENG Xin;LV Jia(School of Electric Power,South China University of Technology,Guangzhou 510640,China;State Grid Zhejiang Huzhou Power Supply Company,Zhejiang Huzhou,China;College of Electric Engineering,Xi＇ an Jiaotong University,Xi＇ an 710049,China)
出处
《智慧电力》
北大核心
2018年第8期8-12,51,共6页
Smart Power
基金
国家自然科学基金项目(51507126)~~
关键词
连锁故障
熵权法
脆弱性评估
电网结构
运行状态
cascading failures
entropy weight method
vulnerability assessment
grid structure
running state
