电力系统及其自动化学报2018，Vol.30Issue(5)：75-79,85,6.DOI:10.3969/j.issn.1003-8930.2018.05.013
基于熵值的特高压直流输电线路双端电压保护
Two-terminal Voltage Protection Based on Entropy Analysis for UHVDC Transmission Lines
彭涛 1江亚群 1黄纯1
作者信息
- 1. 湖南大学电气与信息工程学院,长沙 410082
- 折叠
摘要
Abstract
In the analysis of faults inside and outside a ±800 kV ultra high voltage direct current(UHVDC)transmission line region,it is found that due to the existence of smoothing reactors,DC filters and programmable logic controller (PLC)filter,the physical boundaries of DC lines are formed,which have strong attenuation for high-frequency signals. Therefore,there is huge difference between the high-frequency fault signals(measured at the position where relay pro?tection is installed)inside and outside the region.Chebyshev digital filter is used to extract the 600~700 Hz signal of breakdown voltage.On this basis,a new principle for a fast protection of two-terminal transmission line is proposed,in which a fast and accurate recognition of the faults inside and outside the transmission line region is realized based on the Shannon entropy of signals in the frequency range and during one power frequency period after fault.This protection principle is simple,reliable,practical,and it has good selectivity,which can meet the protection requirements for UH?VDC line.PSCAD/EMTDC simulation results demonstrate the feasibility and effectiveness of the proposed method.关键词
直流输电线路/继电保护/切比雪夫滤波器/故障分析/香农熵Key words
DC transmission line/relay protection/Chebyshev filter/fault analysis/Shannon entropy分类
信息技术与安全科学引用本文复制引用
彭涛,江亚群,黄纯..基于熵值的特高压直流输电线路双端电压保护[J].电力系统及其自动化学报,2018,30(5):75-79,85,6.
