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

被引：0
|
作者：
Huang X. [1 ]
Luo P. [1 ]
Gong J. [1 ]
Xie L. [1 ]
Yang C. [2 ]
机构：
[1] School of Electrical Engineering, Shanghai University of Electric Power, Shanghai
[2] College of Electronics and Information Engineering, Tongji University, Shanghai
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2020年 / 48卷 / 13期
基金：
中国国家自然科学基金;
关键词：
All-phase FFT; Phase difference correction; Phasor detection; Renewable energy grid-connected; Subsynchronous oscillation;
D O I：
10.19783/j.cnki.pspc.190942
中图分类号：
学科分类号：
摘要：
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. © 2020, Power System Protection and Control Press. All right reserved.
引用
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页码：38 / 44
页数：6
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