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This Letter proposes a modified method for the dynamic harmonic analysis of signals with non‐stationary harmonics, which is based on the previously proposed multiple‐resonator observer structure. An optimisation technique is applied to reshape frequency responses of the basic transfer functions. This method, by using a parallel structure with common feedback, is very robust and, in addition, allows a reduction of the computational burden. The proposed method has been investigated for up to 64 harmonics, using LabView software package, under different conditions, and confirmed to be valuable and efficient tool for signal components estimation. [ABSTRACT FROM AUTHOR]

The Taylor–Fourier transform (TFT) is suitable to analyse the spectrum of signals with non‐stationary harmonics. It can be considered as an FIR filter bank consisting of maximally flat (MF) high‐order filters which are computationally extensive and difficult for implementation. An adapted method is proposed for the TFT harmonic analysis which is based on the previously proposed multiple‐resonator observer structure. The MF conditions are imposed to reshape frequency responses. This method by using a parallel structure with common feedback is very robust and, in addition, allows a reduction of the computational burden. Besides, this estimation method is adaptive and convenient for application in case of large frequency excursions, since the closed‐form solutions allow that the fundamental frequency fluctuations can be followed by the filter central passband frequency. [ABSTRACT FROM AUTHOR]