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。
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.
出处
《中国测试》
北大核心
2015年第3期99-102 107,共5页
China Measurement & Test
基金
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)
