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Three frequency estimation algorithms are considered and their performance evaluated against real data, represented by pantograph voltage and current signals on AC railways. The three algorithms have different characteristics: the “four parameter sine wave fitting” (4PSF) algorithm is based on LSE against single frequency model, the “phase sensitive frequency estimation” (PSFE) algorithm is based...
The pantograph voltage and current waveforms recorded across the Italian and French high speed railway lines (both Autotransformer 2×25 kV 50 Hz systems) are analyzed to estimate some Power Quality indexes: harmonic spectra, harmonic distortion, displacement factor and fundamental component, in various load conditions. These indexes, that define the electrical interface between the rolling stock and...
The stability of the fundamental frequency of the Autotransformer 2×25 kV 50 Hz French railway is considered, compared also to that of 16.7 Hz systems, analyzed in a previous paper. Its influence on the processing of higher order harmonics is also evaluated. The stability is analyzed by means of the amplitude frequency spectrum, of the short-time Fourier transform and of the residuals of sine-wave...
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