光伏新能源电能计量信号时频域特性分析  

Analysis of the time−frequency domain features of photovoltaic new energy metering signals

作　　者：戴文晗 王学伟[1] DAI WenHan;WANG XueWei(College of Information Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学信息科学与技术学院,北京100029

出　　处：《北京化工大学学报(自然科学版)》2025年第2期65-75,共11页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国网冀北电力有限公司科技项目(52010122001R)。

摘　　要：光伏新能源发电输出具有复杂动态特性,会导致电能计量失准。为了探究光伏新能源发电的特性规律,首先建立了新能源电能计量信号矩阵,基于有限覆盖定理提出非等间隔区间短时傅里叶(short-time Fourier transform,STFT)算法;然后,构建了时频域数据表征模型,用以表示新能源电能计量信号三相电压和电流的时频域实部、虚部信息,并建立特征量矩阵表征时频域重要特征;最后,提取了光伏新能源电能信号时频域重要特征,为电能表误差测试实验信号的时频域特征参数的确定提供理论依据。The output of photovoltaic new energy generation has complex dynamic features,which leads to inaccu-rate energy measurements.In order to explore the features of photovoltaic new energy power generation,a new energy measurement signal matrix was first established,and an unequally spaced interval STFT algorithm was then proposed based on the finite coverage theorem.A time-frequency domain data representation model was then con-structed to represent the real and imaginary parts of the time-frequency domain information of the three-phase volt-age and current of the energy measurement signal.This leads to a feature matrix which represents the important fea-tures in the time-frequency domain.Finally,important time-frequency domain features of photovoltaic new energy signals were extracted,providing a theoretical basis for determining the time-frequency domain feature parameters of the experimental signal for energy meter error testing.

关 键 词：光伏新能源 时频域特征 特征提取 特征量矩阵 

分 类 号：TM933[电气工程—电力电子与电力传动]