Study on the Effect of Sampling Frequency on Power Quality Parameters in a Real Low-Voltage DC Microgrid

Juan J. Pérez-Aragüés () and Miguel A. Oliván ()
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Juan J. Pérez-Aragüés: CIRCE Technology Centre, 50018 Zaragoza, Spain
Miguel A. Oliván: CIRCE Technology Centre, 50018 Zaragoza, Spain

Energies, 2025, vol. 18, issue 15, 1-19

Abstract: In recent years, DC grids have gained traction, and several proposals regarding measuring strategies and several Power Quality (PQ) parameters have been defined to be used in such networks that differ from traditional AC power grids. As a complement to all this preliminary work, this study on the effect of modifying the sampling frequency on some of those parameters has been conducted. For time series evaluation of mean and RMS voltage values, the Dynamic Time Warping (DTW) algorithm has been used. Additionally, the consequence of varying the sampling rate in voltage event detection has also been analysed. As a result, relevant advice regarding sampling frequency is presented in this paper for an effective and optimum evaluation of RMS or mean voltage values and its implementation in detecting voltage events (dips or swells). At least for the parameters in the monitored DC microgrid, a clue for the minimum sampling rate that guarantees accurate measurements is found.

Keywords: Power Quality; DC grids; DC networks; DC measurements; sampling frequency; sampling rate; Dynamic Time Warping; RMS voltage; mean voltage; voltage events; dips; swells (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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