Rao, K.Shubhanga, K.N.2026-02-062024Lecture Notes in Electrical Engineering, 2024, Vol.1083 LNEE, , p. 139-15218761100https://doi.org/10.1007/978-981-99-6151-1_10https://idr.nitk.ac.in/handle/123456789/29141Digital Taylor-Fourier Transform (DTFT) is a Taylor series-based extension to Discrete Fourier Transform. It is becoming popular due to its ability to estimate off-nominal frequency phasors accurately, which is lacking in DFT, the conventional technique used in Phasor Measurement Units (PMUs). In light of this, a lucid presentation of the mathematical formulation of DTFT is considered instructive and hence the same is attempted here. Further, the ability of DTFT filter to accurately estimate off-nominal frequency phasors, off-nominal frequency harmonics and exponentially varying sinusoids is illustrated and reasoned out. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.Digital Taylor-Fourier transform (DTFT)Electromechanical mode identificationHarmonic filterPhasor measurement unit (PMU)