地震灾害下配电网的脆弱性分析及弹性提升措施  

Vulnerability Analysis and Resilience Improvement of Distribution Network Under Earthquake Disasters

作　　者：雷霞 郑国鑫 胡益 LEI Xia;ZHENG Guoxin;HU Yi(School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 610039,Sichuan Province,China)

机构地区：[1]西华大学电气与电子信息学院,四川省成都市610039

出　　处：《电网技术》2021年第9期3674-3680,共7页Power System Technology

基　　金：国家自然科学基金项目(51877181);四川省科技厅项目(2019YFG0153)。

摘　　要：地震灾害对配电网的影响极大,会导致大范围停电,而高弹性配电网具有抵御地震灾害和灾后紧急供电的能力。针对地震灾害下配电网的弹性提升问题,首先对配电网区域进行网格化划分,结合地震动衰减方程,求出各个网格的地震动大小;再根据威布尔分布下配网线路的可靠性模型以及地震灾害下配网线路的脆弱性模型,建立配网线路的综合故障率模型,计算出多个地震场景下系统的信息熵,以找出配电网中极易受损的线路;其次针对线路加固和分布式电源最优配置的弹性提升措施进行建模,将其转化为两阶段整数线性规划问题,第1阶段以总投资费用最小为目标函数,第2阶段的目标是根据系统功能曲线在灾害中的变化建立配电网的弹性评估指标并使其最大化;最后以IEEE33节点测试系统为例,进行地震灾害下配电网的弹性分析,比对配电网采取提升措施前后的弹性指标,验证了所提方法的可行性。Earthquake disasters will cause large-scale blackouts, having a great impact on the distribution network. The highly resilient distribution network, however, has the ability to withstand the earthquake disasters and provide emergency power supply after the disasters. Aiming at the resilience improvement measures for the distribution network under an earthquake disaster, the distribution network area is divided into multi-grids first. The magnitude of ground motion in each grid is calculated with the ground motion attenuation equation. Secondly, based on the reliability with the Weibull distribution and the vulnerability of the distribution lines in the earthquake disaster, the comprehensive failure rate model of the distribution lines is established. The information entropy of the system in the multiple earthquake scenarios is calculated to get the most vulnerable line set. Thirdly, the model for the resilience improvement measures which include line reinforcement and the optimal configuration of distributed power sources is set up and transformed into a two-stage integer linear programming problem: The total investment cost is minimized in the first stage. And the resilience evaluation index of the distribution network, calculated on the trends of the system function curve in a disaster, is maximized in the second stage. Finally, taking the IEEE33 node test system as an example, the resilience analysis of the distribution network under earthquake disasters is carried out. The resilience index of the distribution network before and after using the resilience improvement measures is compared to verify the feasibility of the proposed method.

关 键 词：地震 弹性配电网 网格化 故障率模型 弹性提升措施 

分 类 号：TM721[电气工程—电力系统及自动化]