自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第51卷    第9期    总第313期    2020年9月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2020)09-2504-10
基于谱序列变换的高精度谐波参数估计算法
杨喜1, 2,汪旭明3,陈炳权1,张仁民1,王向明4,雷可君1

(1. 吉首大学 信息科学与工程学院,湖南 吉首,416000;
2. 东南大学 信息科学与工程学院,江苏 南京,210096;
3. 吉首大学 物理与机电工程学院,湖南 吉首,416000;
4. 上交所技术有限责任公司,上海,200120
)

摘 要: 基于高精度谐波分析是电力系统谐波污染治理的前提,由于频谱泄漏的影响,经典的谐波分析算法存在参数估计精度不高、计算复杂度较大等问题,为此,在分析信号谱线衰减特征的基础上,提出一种基于谱序列变换的高精度谐波参数分析算法。该算法通过对信号进行FFT运算得到谱序列并对其实施特定的加权变换,加速非真实频率处谱线的衰减速度,从而达到有效抑制频谱泄漏的目的,在此基础上推导谐波幅值和相位的计算公式。研究结果表明,与经典的加窗插值算法和FFT改进算法相比,所提出的算法所得谐波参数估计精度显著提高,且其在基波频率变化及间谐波条件下均表现出优良的估计性能;此外,与经典的加窗插值算法相比,新算法只需对谱序列进行简单处理,具有计算复杂度低的优点。

 

关键字: 谐波分析;快速傅里叶变换;谱序列变换;参数估计;频谱泄漏

High precision harmonic parameter estimation algorithm based on spectral sequence transformation
YANG Xi1, 2, WANG Xuming3, CHEN Bingquan1, ZHANG Renmin1, WANG Xiangming4, LEI Kejun1

1. College of Information Science and Engineering, Jishou University, Jishou 416000, China;
2. School of Information Science and Engineering, Southeast University, Nanjing 210096, China;
3. College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, China;
4. Shanghai Stock Exchange Technology Co. Ltd., Shanghai 200120, China

Abstract:High-precision harmonic analysis is the premise of harmonic pollution control in the power system. Due to the influence of spectrum leakage, the classical harmonic parameter estimation algorithms have some disadvantages, such as low accuracy of parameter estimation and high computational complexity.Based on the analysis of spectral line attenuation characteristics, a high-precision harmonic analysis algorithm based on spectral sequence transformation was proposed. The algorithm performed a specific weighted transformation on the spectral sequence obtained via fast Fourier transform(FFT), which accelerated the attenuation rate of spectral lines at the unreal frequencies, and thus effectively suppressed the spectrum leakage. Based on this, an effective estimation method of harmonic amplitude and phase was proposed. The results show that, compared with the classical windowed interpolation algorithm and the improved FFT algorithm, the proposed algorithm in the paper improves the accuracy of parameter estimation significantly, and shows excellent performance when the fundamental frequency changes or inter-harmonics exists. In addition,compared with the classical windowed interpolation algorithms, the proposed algorithm only needs simple processing of spectral sequence, and has the advantage of low computational complexity.

 

Key words: harmonic analysis; fast Fourier transform(FFT); spectral sequence transformation; parameter estimation; spectrum leakage

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号