电测与仪表2025，Vol.62Issue(10)：121-132,12.DOI:10.19753/j.issn1001-1390.2025.10.014
基于Hermite插值的非同步采样数据谐波计算方法
Harmonic calculation method for non-synchronous sampling data based on Hermite interpolation
摘要
Abstract
The high cost of power quality monitoring makes it difficult to install them on a large scale in distribution network,resulting in incomplete information on nodal harmonic monitoring.The use of alternative monitor equip-ment(AME),such as intelligent fusion terminals,for harmonic monitoring and calculation is an inevitable way to solve the problem of network-wide observable power quality in distribution networks.However,due to the AME non-synchronous sampling,there is the problem of inaccurate harmonic calculation.This paper proposes a harmon-ic calculation method adapted to non-synchronous sampling data,which can be applied to AME to achieve extensive harmonic monitoring in distribution networks.Considering that the accuracy of AME sensing is lower than that of professional power quality monitoring terminals,resulting in significant data noise,a denoising method based on singular spectrum analysis on key point algorithm is proposed to reduce the interference of noise in data processing.A fundamental period calculation method based on variational mode decomposition and Newton interpolation is pro-posed to eliminate the negative effects of harmonic components and achieve high-precision fundamental period ex-traction.A quasi-synchronous sampling method based on Hermite interpolation is proposed to overcome the spectral leakage and fence effect when performing harmonic calculations based on the discrete Fourier transform.The simu-lation verifies the effectiveness,accuracy and adaptability of the proposed method under two scenarios of frequency offset and frequency variation.关键词
电能质量/谐波计算/降噪/基波周期计算/准同步采样/Hermite插值Key words
power quality/harmonic calculation/denoising/fundamental period calculation/quasi-synchronous sampling/Hermite interpolation分类
信息技术与安全科学引用本文复制引用
汪颖,罗旭,卫书满,陈韵竹,马晓阳..基于Hermite插值的非同步采样数据谐波计算方法[J].电测与仪表,2025,62(10):121-132,12.基金项目
国家自然科学基金资助项目(52077145) （52077145）
