A Precise Calculation of Power System Frequency
A Precise Calculation of Power System Frequency
复制标题
DOI：
10.1109/mper.2001.4311328
复制
发表时间：
2001-04
期刊：
影响因子：
--
通讯作者：
J. Yang;C. W. Liu
中科院分区：
文献类型：
--
作者：
J. Yang;C. W. Liu
提出了一种基于离散傅里叶变换(DFT)的实时估计含谐波正弦波频率的精确数字算法。这种算法称为智能离散傅立叶变换(SDFT)，巧妙地避免了频率偏离标称频率时产生的误差，并保持了DFT的所有优点(例如，不受谐波影响，SDFT可以使用递归计算)。这些使得SDFT比传统的基于DFT的技术更准确。此外，该方法具有递归性，易于实现，适合于实时使用。给出了与传统DFT方法和二阶Prony方法的仿真结果，验证了SDFT方法的优越性。
A precise digital algorithm based on discrete Fourier transforms (DFT) to estimate the frequency of a sinusoid with harmonics in real time is proposed. This algorithm, which we call the smart discrete Fourier transform (SDFT), smartly avoids the errors that arise when frequency deviates from the nominal frequency, and keeps all the advantages of the DFT (e.g., immune to harmonics and the recursive computing can be used in SDFT). These make the SDFT more accurate than conventional DFT-based techniques. In addition, this method is recursive and easy to implement, so it is suitable for use in real time. We provide the simulation results compared with a conventional DFT method and second-order Prony method to validate the claimed benefits of SDFT.