罗立波 朱咏明 杨振 何龙 吴伟丽 刘俊 张田明

摘 要：工程上對铁磁谐振过电压故障多采用事后治理方式，仍存在设备过电压风险，为此，提出铁磁谐振过电压影响因素灵敏度分析的方法，对各影响因素的作用程度进行量化对比研究，确定关键影响因素并提出预防策略，以期为防御铁磁谐振过电压风险提供参考。首先，分析铁磁谐振故障演变过程，确定影响铁磁谐振故障的各因素及其作用;其次，构建灵敏度指标，提出基于Sobol方法的铁磁谐振影响因素灵敏度分析方法，确定关键影响因素;最后以新疆某地区级配电网为例，搭建了铁磁谐振过电压的ATP-EMTP仿真模型，利用ATP-EMTP电磁仿真软件，结合实际电网参数和设备数据，遍历各影响参数可能取值，重点模拟单相故障消除后铁磁谐振过电压的工况，研究和对比了多种工况下的铁磁谐振各影响因素的作用程度。结果表明，变压器中性点消弧线圈、互感器中点电阻和激发性故障消除时刻是该配电网消谐的关键影响因素。关键词：铁磁谐振;ATP-EMTP;关键因素;FTA;Sobol中图分类号：TM 714

文献标志码：A

文章编号：1672-9315（2020）06-01088-08

DOI：10.13800/j.cnki.xakjdxxb.2020.0620开放科学（资源服务）标识码（OSID）：

Simulation and analysis of sensitivity of factors affecting

ferroresonance overvoltage based on Atp-Emtp

LUO Li-bo1，ZHU Yong-ming1，YANG Zhen1，HE Long1，WU

Wei-li2，LIU Jun3，ZHANG Tian-ming2

（1.State Grid Xinjiang Electric Power Co.，Ltd.，Changji Power Supply Company，Changji 831100，China;

2.College of Electrical and Control Engineering，Xian University of Science and Technology，Xian 710054，China;

3.Anhui Zheng-Guang-TV Power Technology Co.，Ltd.，Hefei  230000，China）

Abstract：Post treatment is often adopted for ferroresonance over-voltage fault in engineering，and there is still over-voltage risk of equipments.Therefore，the sensitivity analysis method of influencing factors of ferroresonance over-voltage is proposed，and the effect degree of each influencing factor is quantified and compared to determine the key influencing factors and to put forward prevention strategies，so as to provide reference for the prevention of ferroresonance over-voltage risk.Firstly，the evolution process of ferroresonance fault is analyzed，and the factors and their functions that affect ferroresonance fault are determined.Secondly，sensitivity index is constructed，and the sensitivity analysis method of ferroresonance influencing factors based on Sobol method is proposed，and the critical ones are determined.Finally，the ATP-EMTP simulation model of ferroresonance over-voltage is built with a regional distribution network in Xinjiang as an example.Using ATP-EMTP electromagnetic simulation software，

the simulation has been conducted of the working conditions of ferroresonance overvoltage after eliminating single-phase fault，with the actual power grid parameters and equipment data in view as well as the possible values of each influencing parameter.A comparison has also been made of

the working range of each influencing factor of ferroresonance under various working conditions.The analysis results show that the arc suppression coil at the neutral point of the transformer，the mid-point resistance of the potential transformer，and the time of fault elimination are the important factors of harmonic elimination.Key words：ferroresonance;ATP-EMTP;critical factors;FTA;Sobol

0 引 言

电磁式电压互感器在我国区域级配电网系统内广泛应用，其主要作用是变送电力信号以供测量和保护装置进行监测和控制。当系统内出现大扰动或者操作时，互感器铁芯可能出现饱和现象，其电感与线路参数、对地电容形成不利配合而发生谐振，这种现象在现代电力系统配电网部分，因近年来线路改造、设备更新和配电网规模增大而时有发生，不仅会造成过电压、过电流、波形畸变和破坏电力绝缘等事故，严重时还将烧毁 PT，对电力系统和设备的安全运行构成巨大威胁[1-2]。……