Original scientific paper

Synchrophasors Determination Based on Interpolated FFT Algorithm

Antonijo Kunac ; Department of Electrical Engineering FESB University of Split Croatia
Marin Despalatović ; Department of Electrical Engineering FESB University of Split Croatia
Dario Šantić ; Department of Electrical Engineering FESB University of Split Croatia

Abstract

Within the standard IEEE C37.118 applications and proposed hardware structure of a phasor measurement unit (PMU) are described. This paper presents
the concept of the system for measuring and transferring synchrophasors from a theoretical aspect. Synchrophasor algorithms are developed
in MATLAB/Simulink for the purpose of easier verification and hardware deployment on today’s market available and affordable real time development
kits. Analysis of the synchrophasor measurement process is performed gradually. Firstly, by defining the synchrophasor based on three-phase
to αβ-transformation and then introducing a discrete Fourier transform (DFT) based on synchrophasor estimation algorithm. Later, accompanying
adverse effects resulting from its application are analyzed by means of simulation. To increase accuracy and improve estimation algorithm interpolated
discrete Fourier transform (IpDFT) with and without windowing technique is used. To further optimize algorithm performance convolution sum
in recursive form has been implemented instead of classical DFT approach. This study was carried out in order to validate described measurement
system for the monitoring of transients during island operation of a local power electric system. Finally, simulation and experimental results including
error analysis are also presented.

Keywords

Digital signal processing, Discrete Fourier transforms, Modeling, Phasor measurement unit, Simulation

Hrčak ID:

247115

URI

https://hrcak.srce.hr/247115

Publication date:

15.1.2020.

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