基于广义S变换的光伏电站谐波和间谐波分析方法  

Harmonic and interharmonic analysis method for photovoltaic power station based on generalized S transform

作　　者：宋强 张欣[2] 杨路 党三磊 张鼎衢 黄智坤 Song Qiang;Zhang Xin;Yang Lu;Dang Sanlei;Zhang Dingqu;Huang Zhikun(Metrology Center of Guangdong Power Grid Co.,Ltd.,Qingyuan 511699,China;National Institute of Metrology,China,Beijing 100029,China)

机构地区：[1]广东电网有限责任公司计量中心,清远511699 [2]中国计量科学研究院,北京100029

出　　处：《电子测量技术》2024年第3期71-76,共6页Electronic Measurement Technology

基　　金：南方电网公司科技项目(035900KK52220007)资助。

摘　　要：针对S变换高斯窗函数形式固定不变的问题,引入高斯窗调节因子改进S变换,提出一种基于广义S变换的光伏电站谐波和间谐波分析方法。首先通过MATLAB/Simulink搭建光伏电站的仿真模型,在自然采样双极性SPWM调制方式下采集逆变器的三相输出电压;然后以A相电压为例,采用广义S变换对电压信号处理得到一个模时频矩阵;最后对该矩阵分析实现光伏电站谐波和间谐波参数的准确计算。仿真结果表明,本文方法的幅值计算误差最大仅为3.30×10^(-4)%,频率的平均计算误差为0%,远小于S变换幅值误差35.19%和频率误差2.39%;能满足光伏电站谐波和间谐波检测精度的需要。Aiming at the problem of fixed Gaussian window function in the S transform,a Gaussian window adjustment factor is introduced to improve the algorithm,and a harmonic and interharmonic analysis method for photovoltaic power station based on generalized S transform is proposed.Firstly,the simulation model of the photovoltaic power station is built by MATLAB/Simulink,and the three-phase output voltage of the inverter is collected under natural sampling bipolar SPWM modulation mode.Then,taking the A phase voltage as an example,the generalized S transform is used to process the voltage signal to obtain a modular time-frequency matrix.Finally,the harmonic and interharmonic parameters of the photovoltaic power station are accurately calculated,which is achieved by analyzing the matrix.Simulation results show that the maximum amplitude calculation error of the method is only 3.30×10^(-4)%,the average calculation error of frequency is 0%,which is much smaller than the S transform amplitude error of 35.19%and frequency error of 2.39%.The need for detection accuracy of harmonics and interharmonics can be met in photovoltaic power station.

关 键 词：光伏电站 谐波分析 间谐波分析 广义S变换 

分 类 号：TM933[电气工程—电力电子与电力传动]