Improved electrogeometric model for shielding failure evaluation of double-circuit UHVAC transmission lines based on leader propagation simulations

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2024-11-16 DOI:10.1016/j.epsr.2024.111240

Ziwei Ma , Jasronita Jasni , Mohd Zainal Abidin Ab Kadir , Norhafiz Azis , Yanhua Ma

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引用次数: 0

Abstract

Both the conventional electrogeometric method (EGM) and leader propagation method (LPM) exhibit deficiencies in predicting the shielding failure (SF) performance of UHV transmission lines (TLs). This paper is dedicated to propose an improved EGM (IEGM) model based on LPM simulations. Firstly, a finite element leader inception and propagation model (FEM-LPM) for lightning attachment to a double-circuit UHVAC TL was developed. Secondly, the effects of operating voltage, downward leader (DL) lateral distance, conductor sag, and terrains on the striking distance (SD) were analyzed using this LPM-FEM model. Simulations show that the operating voltage increases the SD of the ground wire. The increase in DL lateral distance slightly increases the upper phase SD. Increases in both conductor sag and slope cause an increase in exposure width of phase lines, which reduces the SF performance of the TL. Finally, an IEGM model adapted to different slope was proposed based on simulations, and the shielding failure rate (SFR) of the TL calculated based on this IEGM model is close to the field observations of a real case. Due to the lack of more statistics on SFR so far, the model is expected to be validated by more practical cases in the future.

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基于领导者传播模拟的双回路超高压交流输电线路屏蔽失效评估的改进型电地理模型

在预测超高压输电线路（TL）的屏蔽失效（SF）性能方面，传统的电地法（EGM）和领导者传播法（LPM）都存在缺陷。本文致力于在 LPM 仿真的基础上提出一种改进的 EGM（IEGM）模型。首先，针对雷电附着在双回路特高压交流输电线路上的情况，开发了一种有限元领导萌发和传播模型（FEM-LPM）。其次，利用该 LPM-FEM 模型分析了工作电压、引下线（DL）横向距离、导体下垂和地形对雷击距离（SD）的影响。模拟结果表明，工作电压会增加地线的击穿距离。DL 侧向距离的增加会略微增加上相 SD。导体下垂和坡度的增加会导致相线暴露宽度增加，从而降低 TL 的 SF 性能。最后，在模拟的基础上提出了适应不同坡度的 IEGM 模型，根据该 IEGM 模型计算出的 TL 屏蔽故障率（SFR）与实际案例的现场观测结果接近。由于目前缺乏更多关于 SFR 的统计数据，该模型有望在未来通过更多实际案例得到验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.