|Table of Contents|

Post-earthquake function loss evaluation of power system based on structural function and power supply function(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年01期
Page:
51-61
Research Field:
建筑结构
Publishing date:

Info

Title:
Post-earthquake function loss evaluation of power system based on structural function and power supply function
Author(s):
FU Xing;  HU Yiyin;  LI Gang;  LI Hongnan
(Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China)
Keywords:
power system;  function loss assessment;  fragility curve;  power flow analysis;  failure probability
PACS:
TU352
DOI:
10.19815/j.jace.2023.05080
Abstract:
In order to explore the seismic failure probability of power system, a function loss assessment method combining vulnerability analysis method and power flow analysis method was proposed. Firstly, the function of the power system was defined from two dimensions, including structural function and power supply function. Through the expert questionnaire, the importance coefficient of each subsystem and the partial weighting coefficient of the structural function and power supply function in each subsystem were determined. Then, the traditional probability analysis of seismic risk was replaced by the peak ground acceleration(PGA)corresponding to the fortification intensity of the construction site. The residual function of power system after earthquake was estimated using the fragility curves of power system infrastructure components under four limit damage states given in manual “Guidelines for Seismic Toughness Evaluation of Urban Engineering Systems”. Finally, considering the failure of the power supply function of the preceding components will affect the normal operation of the following components(cascading failure), the failure probability of the components and systems after the earthquake was studied by using the power flow analysis method and Monte Carlo simulation method taking a small power system with seven loads as an example. The results show that when PGA is greater than 0.2g(g is acceleration of gravity), the analysis results of the power flow analysis method considering cascading failures between power system components and the fragility curve estimation method are gradually separated, and the former has a higher failure probability and less residual functions. It is necessary to consider the coupling relationship between components when evaluating the overall function of power system. The combination of fragility curve method and power flow analysis method can macroscopically evaluate the failure probability of complex power system, and this method can be conveniently applied to urban power system, which is an effective method to study the resilience of power system.

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Last Update: 2025-01-20