宁夏电力Issue(5)：45-51,7.DOI:10.3969/j.issn.1672-3643.2025.05.007
基于多时间尺度的配电网线路强度退损建模
Multi-time-scale strength degradation modeling for distribution network lines
摘要
Abstract
To improve the accuracy of degradation modeling for distribution network lines,this paper proposes a multi-time-scale degradation analysis method.Considering the heterogeneous mechanisms of long-term natural degradation and short-term sudden impact degradation,refined models are established for towers and conductors separately.In the long-term model,tower degradation is quantified by the cross-sectional loss of reinforcement steel caused by corrosion,dynamically characterized through chloride ion diffusion and active corrosion stages.Conductor degradation integrates both micro-vibration wear and high-temperature thermal aging,quantified using time-varying degradation functions and thermal equilibrium equations.In the short-term model,a mapping relationship between wind-induced impacts and deg-radation increment is introduced to characterize irreversible damage accumulation.By linearly superimposing long-term and short-term degradation components,a full-process degradation model and failure probability assessment method are proposed.Simulation results demonstrate that under combined long-and short-term degradation,the degradation levels of towers and conductors reach 16.54％ and 22.67％,respectively,with the failure probability 19.5％higher than that of the long-term-only model,verifying the necessity of the proposed synergistic model under wind conditions.This study provides theoretical support for reliability assessment and risk prevention of distribution networks.关键词
配电网线路/强度退损/多时间尺度/长期退化/短期冲击Key words
distribution network lines/strength degradation/multi-time-scale/long-term degradation/short-term impact分类
信息技术与安全科学引用本文复制引用
余波,段晓庆,白涛,郭永亮,张轩华..基于多时间尺度的配电网线路强度退损建模[J].宁夏电力,2025,(5):45-51,7.基金项目
国网宁夏电力有限公司科技项目(5229SZ240004) （5229SZ240004）
