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Two-Stages Sliding Fourier Transform for High Performance Phase Angle and Frequency Tracking
Journal of Electrical Engineering & Technology ( IF 1.9 ) Pub Date : 2020-07-06 , DOI: 10.1007/s42835-020-00476-9
Osama Mohammed Arafa

Sliding discrete Fourier transform (SDFT) gives excellent performance at nominal frequency operation. However, at off-nominal frequency, it generates errors in both magnitude and phase angle due to spectral leakage. Moreover, its harmonic rejection ability is greatly impaired in this case. This paper introduces a method to apply sliding Fourier transform under off-nominal frequency at fixed sampling rate while fixing the defects associated with it off-nominal frequency operation. This method involves the use of two stages sliding Fourier transform (SFT). A fixed window-width SFT in the first stage is used to drive the variable window-width SFT in the second stage. The proposed technique (SFT–SFT) is tested in real time on dSPACE MicroLabBox using pre-generated voltage vectors to simulate the most inconvenient grid conditions. The testing scenarios proved its superior performance compared to the decoupled stationary reference frame PLL method.

中文翻译:

用于高性能相角和频率跟踪的两级滑动傅里叶变换

滑动离散傅里叶变换 (SDFT) 在标称频率操作下提供出色的性能。然而,在非标称频率下,由于频谱泄漏,它会在幅度和相位角上产生误差。而且,在这种情况下,它的谐波抑制能力大大削弱。本文介绍了一种在非标称频率下以固定采样率应用滑动傅里叶变换的方法,同时修复了与非标称频率操作相关的缺陷。该方法涉及使用两级滑动傅里叶变换 (SFT)。第一级中的固定窗口宽度 SFT 用于驱动第二级中的可变窗口宽度 SFT。所提出的技术 (SFT-SFT) 在 dSPACE MicroLabBox 上使用预先生成的电压矢量进行实时测试,以模拟最不方便的电网条件。
更新日期:2020-07-06
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