作者：顾小兴, 金涛, 郭艳威

作者单位：福州大学电气工程与自动化学院, 福建 福州 350108

关键词：谐波检测;端点效应;经验模态分解;镜像延拓;包络原则

摘要：

为对电力系统谐波进行有效的检测,提出一种改进的基于镜像延拓的方法对信号数据边界进行端点处理.通过对端点和极值点的判断比较来选取镜面进行延拓,按照包络原则对延拓之后的信号进行经验模态分解(EMD),并得到IMF分量.仿真实验结果表明:改进后的方法幅值及频率检测准确度明显优于改进前,能够有效改善EMD端点效应,准确快速地分解出各种模态的谐波,适用于电力系统谐波的检测.

Power system harmonic HHT detection based on improved EMD method

GU Xiaoxing, JIN Tao, GUO Yanwei

School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China

Abstract: To detect the harmonic of power system effectively, an improved method based on extreme points mirror extension is proposed to restrain signal endpoint effect for the boundary of data. The endpoints and extreme points are compared to select a proper mirror to extend, and then EMD decomposition is conducted to obtain the IMFs to the signals after extension as the enveloping principle. A simulation experiment is conducted at the end, the results of testing signal and simulation experiment show that the improved method is effectively to the improvement of EMD endpoint effect and accurately to the decomposition of different models of harmonic, and it's very properly to harmonic detection.

Keywords: harmonic detection;boundary effect;EMD;mirror extension;enveloping principle

2015, 41(3): 99-102,107  收稿日期: 2014-7-5;收到修改稿日期: 2014-9-21

基金项目: 国家自然科学基金(50907011);福建省杰出青年科学基金(2012J06012);福建省高校杰出青年人才培育基金(JA1108);福州大学人才基金(XRC-0910)

作者简介: 顾小兴(1988-),男,江西上饶市人,硕士研究生,专业方向为电机电器、测试计量技术.

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