A Frequency Estimation Algorithm of Power System Considering Out-of-band Interference

被引：0
|
作者：
Bai S. [1 ]
Pan C. [1 ]
Xiong S. [1 ]
Fu L. [1 ]
机构：
[1] College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 03期
基金：
中国国家自然科学基金;
关键词：
DFT; Frequency estimation; Out-of-band interference; Power systems; Taylor model;
D O I：
10.13335/j.1000-3673.pst.2018.2766
中图分类号：
学科分类号：
摘要：
Out-of-band interference and fundamental frequency deviation decreases accuracy of frequency estimation sharply, so that a frequency estimation algorithm of power systems considering out-of-band interference was proposed to solve this problem in this paper by modeling frequency deviation of fundamental component and out-of-band interference. Firstly, leakage phenomenon is analyzed considering out-of-band interference and fundamental frequency deviation, and a rough out-of-band phasor is obtained by reassigning phasor estimation of discrete Fourier transform (DFT). Then, the rough phasor was utilized to calculate rough out-of-band frequency, treated as the reference frequency of the expanding Taylor model. Finally, according to the higher-order derivatives of Taylor model, accurate frequency estimation could be obtained. Simulations show that the proposed algorithm can accurately yield both fundamental frequency and out-of-band frequency under frequency deviation and noise disturbance. The power-system-voltage test illustrates that the proposed algorithm can provide frequency estimations with smaller fluctuation than that of the algorithms in comparison. © 2019, Power System Technology Press. All right reserved.
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页码：761 / 768
页数：7
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