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首页> 外文期刊>International Journal of Power Electronics and Drive Systems >Frequency adaptive sliding fourier transform for synchronizing VSI to the grid
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Frequency adaptive sliding fourier transform for synchronizing VSI to the grid

机译：频率自适应滑动傅立叶变换，用于将VSI与电网同步

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Sliding Discrete Fourier Transform (SDFT) is very efficient regarding computational load and it possesses a very fast phase angle detection with excellent harmonic rejection at nominal frequency. However, at off-nominal frequency, SDFT generates errors in both magnitude and phase angle due to spectral leakage. This paper introduces a workaround for Fourier Transform to handle this disability under off-nominal frequency while avoiding variable-rate sampling. Sliding Fourier Transform (SFT) is used as a phase detector for a phase-locked loop whose output frequency is used to drive the SFT. The paper revisits the mathematics of Fourier Transform (FT) in a three-phase setting via a time-domain approach to show a newly proposed filtering technique for the double-frequency oscillation just by summing the FT sine/cosine filter outputs of the three individual phases. Also, the analysis aims to determine and correct the phase and magnitude errors under offnominal frequency operation. The proposed technique (SFT-PLL) is tested in real time on dSPACE DS1202 DSP using voltage vectors that are pregenerated to simulate the most adverse grid conditions. The testing scenarios compare the performance of the SFT-PLL with that of the Decoupled Stationary Reference Frame PLL (dαβPLL). The results prove that SFT-PLL is superior to dαβPLL.
机译：滑动离散傅立叶变换（SDFT）对于计算负载非常有效，并且具有非常快速的相角检测能力，并且在标称频率下具有出色的谐波抑制能力。但是，在非标称频率下，由于频谱泄漏，SDFT会在幅度和相位角上产生误差。本文介绍了一种傅立叶变换的变通方法，可以在偏离标称频率的情况下处理这种残疾，同时避免可变速率采样。滑动傅里叶变换（SFT）用作锁相环的鉴相器，该锁相环的输出频率用于驱动SFT。本文通过时域方法回顾了三相设置中的傅立叶变换（FT）的数学原理，展示了通过将三个独立的FT正弦/余弦滤波器输出相加得出的双频振荡新提出的滤波技术阶段。同样，该分析旨在确定和校正名义频率操作下的相位和幅度误差。所提出的技术（SFT-PLL）使用预先生成的电压矢量在dSPACE DS1202 DSP上进行了实时测试，以模拟最不利的电网条件。测试方案将SFT-PLL的性能与去耦的固定参考框架PLL（dαβPLL）的性能进行了比较。结果证明，SFT-PLL优于dαβPLL。

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