新能源并网系统次同步谐波相量检测方法  

Subsynchronous harmonic phasor detection in a renewable energy grid-connected system

作　　者：黄星宇 罗萍萍 龚锦霞 谢琳宇 杨春奇 HUANG Xingyu;LUO Pingping;GONG Jinxia;XIE Linyu;YANG Chunqi(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;College of Electronics and Information Engineering,Tongji University,Shanghai 200000,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]同济大学电子与信息工程学院,上海200000

出　　处：《电力系统保护与控制》2020年第13期38-44,共7页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51607112)。

摘　　要：新能源汇集地区产生的次同步谐波会影响电网安全稳定运行,传统傅里叶算法的次同步谐波检测精度容易受到频谱泄漏和栅栏效应的影响。为了提高次同步谐波相量的检测精度,提出了一种基于Nuttall窗和全相位傅里叶分析(apFFT)的新算法。通过将采样数据分成N段,并加两次4项5阶Nuttall窗,得到预处理后的N点数据分段再进行FFT。进而,基于apFFT和传统FFT幅值的平方关系以及apFFT自身的“相位不变性”,校正幅值和频率的全相位谱分析结果。相比于特征根分析方法和插值校正傅里叶方法,该方法在保持傅里叶方法快速性的同时提高了次同步谐波检测精度。仿真结果验证了该方法的有效性。The subsynchronous harmonics generated by a renewable energy collection area will affect the safety and stability of a power grid,and the harmonic detection accuracy of the traditional Fourier algorithm is easily affected by spectrum leakage and the fence effect.In order to improve the detection accuracy of subsynchronous harmonics,a new algorithm based on the Nuttall window and all-phase Fourier analysis(apFFT)is proposed.By dividing the sampled data into N segments and adding 4 terms 5 orders Nuttall windows twice,the pre-processed N-point data segments are obtained and FFT is performed.Further,based on the square relationship of amplitude between apFFT and traditional FFT and the“Phase invariance”of apFFT,the apFFT spectrum analysis results of amplitude and frequency are corrected.Compared with the eigenvalue analysis method and the interpolation correction FFT method,this method improves the accuracy of subsynchronous harmonic detection while maintaining the speed of FFT.The simulation results verify the effectiveness of the proposed method.

关 键 词：新能源并网 次同步振荡 相量检测 相位差校正 全相位傅里叶 

分 类 号：TM935[电气工程—电力电子与电力传动] TM933.313