Assessment of Errors of Fundamental Frequency Estimation Methods in the Presence of Voltage Fluctuations and Distortions

TL;DR

This paper evaluates the accuracy of different fundamental frequency estimation methods in power grids with voltage fluctuations and distortions through numerical simulations, highlighting their robustness and error characteristics.

Contribution

It provides a comparative assessment of fundamental frequency estimation methods under realistic power grid conditions with fluctuations and distortions.

Findings

IEC 61000-4-30 method performance analyzed

Estimation errors increase with voltage fluctuations

Distortions significantly affect estimation accuracy

Abstract

The fundamental frequency is one of the parameters that define power quality. Correctly determining this parameter under the conditions that prevail in modern power grids is crucial. Diagnostic purposes often require an efficient estimation of this parameter within short time windows. Therefore, this article presents the results of numerical simulation studies that allow the assessment of errors in various fundamental frequency estimation methods, including the standard IEC 61000-4-30 method, when the analyzed signal has a form similar to that found in modern power grids. For the purposes of this study, a test signal was adopted recreating the states of the power grid, including the simultaneous occurrence of voltage fluctuations and distortions. Conclusions are presented based on conducted research.