交直流混合驱动微电网非特征谐波检测技术  

Non-characteristic Harmonic Detection Technology for AC/DC Hybrid Drive Microgrid

作　　者：敖榜 郭尧 杨伟 王鹏凯 AO Bang;GUO Yao;YANG Wei;WANG Peng-kai(Digital Grid Research Institute,CSG,Guangzhou 510700 China)

机构地区：[1]南方电网数字电网研究院有限公司,广东广州510700

出　　处：《自动化技术与应用》2025年第4期134-137,187,共5页Techniques of Automation and Applications

基　　金：南网数研院项目(2100002022030102,JF00035)。

摘　　要：交直流混合驱动下的电压和电流不对称畸变会导致微电网产生非特征谐波,提取时存在模态混叠和易受噪声干扰等问题,导致谐波检测难度较大。提出交直流混合驱动微电网非特征谐波检测方法。建模分析微电网中非特征谐波特征。采用埃尔米特插值法对极值点对应的曲线完成拟合处理,通过经验模态分解方法,获取Hilbert变换信号的固有模态分量。根据IMF分量获取微电网信号的时频特征,实现交直流混合驱动微电网的非特征谐波检测。实验结果表明,所提方法能够准确获取电压谐波和电流谐波,且与谐波实际情况相比,该方法检测的谐波幅值与谐波实际幅值基本一致。The distortion of voltage and current asymmetry leads to the generation of non characteristic harmonics in the microgrid,which is prone to modal aliasing and noise interference during extraction,resulting in greater difficulty in harmonic detection.Therefore,a novel method for detecting non characteristic harmonics of AC/DC hybrid drive microgrid is proposed.Modeling and analyzing the characteristics of non characteristic harmonics in microgrid,Hermite interpolation is used to fit the curve corresponding to the extreme point,and empirical mode decomposition is used to obtain the natural mode components of Hilbert transform signal.Ac-cording to the IMF component,the time-frequency characteristics of the microgrid signal are obtained,and the non characteristic harmonic detection of the AC/DC hybrid drive microgrid is realized.Experimental results show that the proposed method can ac-curately obtain voltage harmonics and current harmonics,and compared with the actual situation of harmonics,the amplitude of harmonics detected by the proposed method is basically consistent with the actual amplitude of harmonics.

关 键 词：交直流混合驱动微电网 非特征谐波检测 埃尔米特插值法 经验模态分解方法 HILBERT变换 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置] TP391.9[自动化与计算机技术—控制科学与工程]