换流变压器励磁涌流的特殊性分析

发布时间：2018-03-02 07:27

本文关键词： 换流变压器励磁涌流特高压直流输电普通电力变压器 PSCAD　出处：《电网技术》2017年12期 　论文类型：期刊论文

【摘要】：近几年换流变压器空载合闸产生的励磁涌流影响了直流输电系统的安全稳定性。换流变压器由于漏抗高且运行方式特殊,其励磁涌流较特殊。为分析换流变压器空充产生的励磁涌流与普通电力变压器产生的励磁涌流的不同,从换流变压器的基本特性、励磁曲线、绕组结构、运行方式以及有载调压等角度分析了换流变压器励磁涌流的特殊性,并提出了相应的运行建议。分析表明,相较于普通电力变压器的励磁涌流,换流变压器励磁涌流的幅值更高,衰减更慢,二次谐波幅值高、占比小,且受分接头档位的影响。同时,还分析了特高压直流输电工程换流变压器投切顺序对励磁涌流的影响,并提出运行建议。
[Abstract]:In recent years, the inrush current caused by no-load closing of converter transformer affects the safety and stability of HVDC transmission system. The converter transformer has a special operation mode because of its high leakage reactance. The inrush current of converter transformer is special. In order to analyze the difference between the excitation inrush current produced by empty charge of converter transformer and that produced by ordinary power transformer, the basic characteristics of converter transformer, excitation curve, winding structure, In this paper, the particularity of excitation inrush current of converter transformer is analyzed from the angle of operation mode and on-load voltage regulation, and the corresponding operation suggestions are put forward. The analysis shows that, compared with ordinary power transformer, the inrush current of excitation is different from that of ordinary power transformer. The amplitude of excitation inrush current of converter transformer is higher, the attenuation is slower, the amplitude of second harmonic is high, the proportion of secondary harmonic is small, and it is affected by the splice gear. At the same time, the influence of switching order of converter transformer on excitation inrush current in UHV HVDC transmission project is analyzed. And put forward the operation suggestion.
【作者单位】：华南理工大学电力学院;中国南方电网有限责任公司电力调度控制中心;
【基金】：国家自然科学基金项目(51377059,51677073)~~
【分类号】：TM41

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