The sliding DFT

By E. Jacobsen, Richard G. Lyons. IEEE Signal Processing Magazine, 2003

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Variable Sampling Period Filter PLL for Distorted Three-Phase Systems (2012, neutral): “It should be noticed that the filter output is only equal to the DFT coefficient when the NG values are used as input signals (y(NG ) = X(n)).”
Predictive control based selective harmonic elimination with low switching frequency for multilevel converters (2009, methodology): “The SDFT is based on the same principle of the traditional DFT, but it performs the calculations on an N sized sliding window [13], [14].”
A Flexible Harmonic Control Approach Through Voltage-Controlled DG–Grid Interfacing Converters (2012, methodology): “To accurately extract the harmonics, the sliding discrete Fourier transform (SDFT) [17] is used in this work.”
HiPPO: Recurrent Memory with Optimal Polynomial Projections (2020, background): “Specific discrete transforms Examples of sliding transforms considered in the literature include the sliding DFT [26, 28, 36, 37], sliding DCT [43], sliding discrete (Walsh-)Hadamard transform [54, 55, 75], Haar [51], sliding discrete Hartley transform [44], and sliding discrete Chebyshev moments [1”
Detection of Grid Voltage Fundamental and Harmonic Components Using Kalman Filter and Generalized Averaging Method (2016, methodology): “The sliding discrete Fourier transform is the well-known frequencydomain method [11], [12].”