基于傅里叶算法的电力系统输电线路纵联方向保护  

Longitudinal direction protection of power system transmission lines based on Fourier algorithm

作　　者：吴海涛 卞亚芳 WU Haitao;BIAN Yafang(Taizhou Power Supply Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Taizhou 225300,China)

机构地区：[1]国网江苏省电力有限公司泰州供电分公司,江苏泰州225300

出　　处：《无线互联科技》2024年第20期91-94,共4页Wireless Internet Science and Technology

摘　　要：电力系统输电线路的纵联方向保护是电力系统安全稳定运行的重要保障,但是现行技术在实际应用中误动率较高,无法达到预期的保护效果,傅里叶变换可以精确地分离出信号中的各个频率成分,因此,能够更准确地识别故障信号,减少误动和拒动的可能性。为此,文章提出基于傅里叶算法的电力系统输电线路纵联方向保护。通过对输电线路电流行波信号进行傅里叶变换,诊断线路故障状态,根据线路整流侧与逆变侧行波突变状态,确定故障区域,采取相应的保护动作,实现基于傅里叶算法的电力系统输电线路纵联方向保护。经实验证明,文章设计技术误动率不超过1%,采取的保护动作可以有效切断故障,在电力系统输电线路纵联方向保护方面具有良好的应用前景。The longitudinal direction protection of power transmission lines is an important guarantee for the safe and stable operation of the power system.However,the current technology has a high error rate in practical applications and cannot achieve the expected protection effect.Fourier transform can accurately separate the various frequency components in the signal,thus enabling more accurate identification of fault signals and reducing the possibility of misoperation and refusal to move.Therefore,a longitudinal direction protection for power system transmission lines based on Fourier algorithm is proposed.By Fourier transforming the current traveling wave signal of the transmission line,the fault state of the transmission line is diagnosed.Based on the sudden change state of the traveling wave on the rectification side and the inverter side of the line,the fault area is determined,and the corresponding protection actions are taken to achieve longitudinal direction protection of the power system transmission line based on Fourier algorithm.Through experiments,it has been proven that the designed technology has a misoperation rate of no more than 1%,and the taken protective actions can effectively cut off faults.It has good application prospects in the longitudinal direction protection of power transmission lines of the power system.

关 键 词：傅里叶算法 电力系统 输电线路 纵联方向保护 

分 类 号：TM773[电气工程—电力系统及自动化]