间谐波对基波测量误差的影响分析  

Influence of Interharmonics on Fundamental Measurement Error

作　　者：亓富军 田质广 彭静 牛庆松 Qi Fujun;Tian Zhiguang;Peng Jing;Niu Qingsong(Linyi Electric Power Corporation,Linyi Shandong,276000;School of Automation and Electrical Engineering,Linyi University,Linyi Shandong,276000)

机构地区：[1]国网临沂供电公司,山东临沂276000 [2]临沂大学信息学院,山东临沂276000

出　　处：《电子测试》2021年第18期44-46,18,共4页Electronic Test

摘　　要：间谐波广泛存在于电力系统中并对电能质量有不利影响,已经开始在国内外引起关注。本文针对电力系统测量中普遍采用的交流采样技术,分析了存在间谐波干扰时的基波测量误差。研究表明间谐波会给基波测量带来误差,且误差与采样初相角有关,导致数据采集设备难以保证应有的测量精度。传统的单周期采样方法即使采用频率跟踪算法和增加采样点数也不能显著减小测量误差,而多周期采样能够减小间谐波的影响,从而减小测量误差。Interharmonics exists in power system and it brings negative effect to power quality.The problem of interharmonics has received more and more attention.The paper investigates the impact of interharmonics on measurement error of ac sampling,which is widely used in power data acquisition system.The research reveals that interharmonics can bring error to fundamental wave measurement,and makes it impossible for data acquisition instruments to assure acceptable precision.Traditional oneperiod sampling method could do little to reduce the measurement error,even if it traces the power frequency and increases the sampling rate.However,multi-period sampling can reduce the negative effect of interharmonics and measurement error.

关 键 词：电能质量 间谐波 交流采样 频率跟踪 误差分析 

分 类 号：TM935[电气工程—电力电子与电力传动]