短数据窗傅氏算法在微机保护装置中的应用  

STUDY OF SHORT DATA WINDOW ALGORITHM FOR MICROPROCESSOR- BASED PROTECTION SET

作　　者：郑建勇[1] 巫海钢[1] 

机构地区：[1]东南大学电气工程系,南京210096

出　　处：《电力系统自动化》2000年第18期49-52,60,共5页Automation of Electric Power Systems

摘　　要：针对电力系统中微机保护装置实时性、速动性的要求 ,详细介绍了短数据窗傅氏算法在微机保护装置中的应用 ,包括采样点数的选择 ,装置软硬件对算法的影响 ,特定频率、冲击干扰以及系统频率漂移的影响等。经分析得出 :采用 1 2点短数据窗傅氏算法时 ,系统频率漂移和 A/D转换芯片精度的影响较小 ,但滤除 2次～ 6次谐波时短数据窗效果不很明显。当采用 2 4点算法时 ,短数据窗效果比较明显 ,可缩短至 1 0 ms左右 ,但采样速率必须随时跟踪系统频率的变化 ,且The shortdata window algorithm for microprocessor- based protection set is studied,including the relation between data window length and harm onics filtered,the relation between sampling rate and accuracy of A / D conversion,the influence of system frequency on the algorithm accuracy and the effects of impulse interference etc.Through analysis and a large amount of sim ulation,the paper draws the following conclusions.When using 12 sam ple points in a cycle,the error caused by system frequency drift and the requirem ent of A/ D accuracy are relatively low,but the tim e required for extracting fundam ental frequency com ponent from source signal containing 2 nd to 6 th harm onics is notdecreased compared with Fourier algorithm.When using2 4sam ple points in a cycle,the time for extracting fundamental frequency can be decreased to10 m s, but the sampling frequency m ust keep up with change of system frequency and the accuracy of A/ D must be sufficient high.

关 键 词：继电保护 傅氏算法 微机保护装置 电力系统 

分 类 号：TM774[电气工程—电力系统及自动化]