复频谱插值DFT的电力系统低频振荡信号测量方法  

Estimation Method of Power System Oscillation Signal under Power Swing with Using Complex Spectral Interpolation DFT

作　　者：黄瑞 肖宇 刘谋海 单铉昇 温和[1,3] HUANG Rui;XIAO Yu;LIU Mouhai;SHAN Xuansheng;WEN He(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;State Grid Hunan Electric Power Corporation Limited,Changsha 410004,China;Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]国网湖南省电力有限公司,湖南长沙410004 [3]湖南大学智能电气量测与应用技术湖南省重点实验室,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2021年第10期170-177,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(61771190)。

摘　　要：低频振荡是三相电力系统中的一种平衡现象,如何准确、快速地估计振荡信号的参数对于评估和消除低频振荡至关重要.本文提出了一种采用复频谱插值DFT的低频振荡下电力系统动态信号参数估计的方法,该方法利用三相系统的对称特性,通过克拉克变换将电力系统中的三相实信号转换为正交分量形式的复信号,然后对复信号进行离散傅里叶变换,通过复频谱插值方法,利用两个幅度最大的谱线样本来估计各项动态参数.实验仿真结果表明本文方法能在低频振荡的场景下准确高效地实现电网动态参数的估计.Power swing is a balanced phenomenon in a three-phase power system,where accurate and fast parameter estimation of oscillation signal is important for the evaluation and elimination of power swing.This paper presents a method for parameter estimation of power system oscillation signal under power swing based on complex spectral interpolation DFT.The proposed method utilizes the symmetrical characteristics of a three-phase system.A complex exponential with the quadrature components is formed from three-phase real signals by using the Clarke transform.The DFT of the complex exponential is then performed.Moreover,various dynamic parameters are estimated by complex spectral interpolation using two DFT samples with the largest magnitude.The experimental simulation results show that the proposed method can accurately and effectively assess the dynamic parameters of power system under the power swing.

关 键 词：复频谱插值 振荡信号 低频振荡 傅里叶变换 三相系统 

分 类 号：TM935[电气工程—电力电子与电力传动]