基于小波变换的分布式光伏并网谐波检测方法  

Distributed Photovoltaic Grid-Connected Harmonic Detection Method Based on Wavelet Transform

作　　者：王云鹏[1] WANG Yunpeng(Zhongnan Architectural Design Institute Co.,Ltd.,Wuhan 430071,China)

机构地区：[1]中南建筑设计院股份有限公司,湖北武汉430071

出　　处：《电工技术》2023年第15期54-56,共3页Electric Engineering

摘　　要：常规的谐波检测方法以目标谐波信号识别为主,增强的谐波信号能量导致源信号损伤,从而出现较大的谐波检测误差,因此设计了基于小波变换的分布式光伏并网谐波检测方法,通过提取分布式光伏并网谐波信号的频谱特征,修正小波函数得到的信号幅值、相位数据。利用小波变换,构建光伏并网谐波检测模型,对谐波信号进行EMD分解,得出更加准确的谐波电流信号,从而实现分布式光伏并网谐波的高效检测。采用仿真实验的方式,验证了该检测方法的检测误差更小,能应用于实际生活中。The conventional harmonic detection method is mainly based on the target harmonic signal identification,and the enhanced harmonic signal energy leads to the source signal damage,resulting in a large harmonic detection error.Therefore,a distributed grid connected harmonic detection method based on wavelet transform is designed.By extracting the spectral characteristics of distributed photovoltaic grid-connected harmonic signals,the signal amplitude and phase data obtained by the wavelet function are corrected.Using wavelet transform,a photovoltaic grid-connected harmonic detection model has been constructed.The harmonic signal is decomposed by EMD,and a more accurate harmonic current signal is obtained,so as to realize the efficient detection of distributed photovoltaic grid-connected harmonics.Simulation experiments are used to verify that the detection error of the method is smaller and can be applied to real life.

关 键 词：小波变换 分布式光伏 并网 谐波检测方法 频谱特征 检测模型 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]