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.

引用

页码：761 / 768

页数：7