南方电网技术2017，Vol.11Issue(11)：20-26,7.DOI:10.13648/j.cnki.issn1674-0629.2017.11.004
变压器和应涌流产生负序二次谐波的仿真分析
Simulation and Analysis of Negative-Sequence Second Harmonic Created by Sympathetic Inrush Current of Transformer
行武 1郭晓 1胡兵 1王哲1
作者信息
- 1. 南京国电南自电网自动化有限公司,南京 211151
- 折叠
摘要
Abstract
The no-load switching of transformer will result in sympathetic inrush current of the transformer connected in series or in parallel.The sympathetic inrush current of the two transformers exhibits different characteristics from the typical inrush current,and the harmonic characteristics also change.In the AC-DC hybrid power grid,the harmonic coupling characteristic of the converter makes the harmonics in the AC power grid coupled to the DC side which will cause the DC protection malfunction and lead to DC blocking,meanwhile threaten the safe operation of power grid.In this paper,based on the parameters of actual transformer core magnetization characteristic curve,the electromagnetic transient simulation software PSCAD is used to simulate the sympathetic inrush current.The second harmonic characteristics of the single transformer inrush and the sympathetic inrush current are simulated and analyzed.The conclusion is that for single transformer the inrush current is mainly positive-sequence second harmonic current,while the sympathetic inrush current has obvious negative sequence characteristics.This will provide an analytical basis for the practical problems of the negative sequence secondary harmonics that will affect the DC protection.关键词
和应涌流/负序二次谐波/直流保护/PSCADKey words
sympathetic inrush current/negative-sequence second harmonic/DC protection/PSCAD分类
信息技术与安全科学引用本文复制引用
行武,郭晓,胡兵,王哲..变压器和应涌流产生负序二次谐波的仿真分析[J].南方电网技术,2017,11(11):20-26,7.
