引用本文:[点击复制]
[点击复制]
【打印本页】 【在线阅读全文】【下载PDF全文】 查看/发表评论下载PDF阅读器关闭

←前一篇|后一篇→

过刊浏览    高级检索

本文已被:浏览 560次   下载 671 本文二维码信息
码上扫一扫!
一种提高电力系统频率检测精度的改进CZT算法
刘广孚,夏雲,张珊
0
(中国石油大学信息与控制工程学院,山东青岛 266580)
摘要:
讨论线性调频Z变换(CZT)的频率误差原因。指出CZT误差受采样时间和信号初相位的影响,且当信号相位差90°时两信号的CZT频率关于真实值近似对称,并提出改进的正交平均CZT算法。分别对单频信号和电力仿真信号进行仿真实验。结果表明,改进算法的频率精度比传统CZT的精度提高了至少20倍,有效提高了电网频率的分析精度。
关键词:  电力信号  基波频率  线性调频Z变换  正交平均  初相位  采样时间
DOI:10.3969/j.issn.1673-5005.2013.06.027
投稿时间:2013-06-25
基金项目:“十二五”国家科技重大专项资助项目(2011ZX05024-002-009)
Improved CZT algorithm for improving power system frequency detection accuracy
LIU Guang-fu,XIA Yun,ZHANG Shan
(College of Information and Control Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
Causes of frequency measurement errors in chirp-Z transform (CZT) were discussed. It is shown that CZT errors are influenced by sampling time and signal initial phase, and the CZT frequencies of two signals with 90° difference in the initial phase are approximately symmetrical around the true frequency. An improved algorithm named orthometric average CZT was developed. Experiments on simulated single tone signal and simulated power signal show that the new algorithm yields about 20times smaller error bounds than the conventional algorithms, therefore greatly improves the accuracy of frequency analysis in power signal.
Key words:  power signal  fundamental frequency  chirp-Z transform  orthometric average  initial phase  sampling time
版权所有 中国石油大学学报(自然科学版)编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国教育部 主办单位:中国石油大学
地址: 青岛市黄岛区长江西路66号中国石油大学期刊社 邮编:266580 电话:0532-86983496 E-mail: journal@upc.edu.cn
本系统由:北京勤云科技发展有限公司设计