利用傅氏算法求取正确的基波及谐波分量初始角方法的研究  

Research on the Solution of Correct Origin Phase Angle of Fundamental andHarmonic Wave Components by FT

作　　者：程璋 李永坚[2] 汪超[2] 

机构地区：[1]湖南长沙市自来水公司五水厂 [2]湖南工程学院

出　　处：《广东输电与变电技术》2005年第2期13-17,共5页Guangdong Power Transmission Technology

摘　　要：在采用微机实现的故障保护、远距离测量等场合,从测量信号中提取正确的有用信号至关重要,而提取正确有用信号的前提条件是优秀的测量方法、手段及正确的算法 傅氏算法是一种简单而有效的算法,它能有效地消除高次谐波,算法稳定性好、精度高。但如果直接利用基本的傅氏算法公式从信号中提取基波及谐波分量,则有时所求得的基波或谐波分量的相角并不正确。本文对如何利用傅氏算法来求取正确的基波或某次谐波初相角方法分二种情况进行了研究,分析了原因,提出了改进办法,仿真试验证明效果良好。It is very important to extract correct and available signal from measure signal in the cases to realize failure recognition or remote measure by microcomputer. The precondition of extract correct and available signal is the excellent measure method and correct algorithm. Although FT is a simple and available algorithm, it can clear higher harmonic efficiently, and the algorithm has good stability and high accuracy, if we extract the components of fundamental wave or harmonic directly by the basic FT formula, its origin phase angle extracted may be not correct. In this paper, researched how to extract the correct origin phase angle of fundamental wave or harmonic in three cases, and analyzed the cause of faults, the author gives improved methods that show good effect in simulation test.

关 键 词：傅氏算法 相角 基波 谐波 差分 

分 类 号：TM[电气工程]