A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics
The recent developments in renewable energy have led to a higher proportion of converter-connected power generation sources in the grid. Operating a high renewable energy penetration power system and ensuring the frequency stability could be challenging due to the reduced system inertia, which is us...
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doaj-14277d64f399455e8dbaac20aaed46a72021-04-27T23:03:17ZengMDPI AGEnergies1996-10732021-04-01142492249210.3390/en14092492A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine DynamicsFeng Guo0David Schlipf1Wind Energy Technology Institute, Flensburg University of Applied Sciences, 24943 Flensburg, GermanyWind Energy Technology Institute, Flensburg University of Applied Sciences, 24943 Flensburg, GermanyThe recent developments in renewable energy have led to a higher proportion of converter-connected power generation sources in the grid. Operating a high renewable energy penetration power system and ensuring the frequency stability could be challenging due to the reduced system inertia, which is usually provided by the conventional synchronous generators. Previous studies have shown the potential of wind turbines to provide an inertia response to the grid based on the measured rate of change of the grid frequency. This is achieved by controlling the kinetic energy extraction from the rotating parts by its converters. In this paper, we derive a spectral-based model of the grid frequency by analyzing historical measurements. The spectral model is then used to generate realistic, generic, and stochastic signals of the grid frequency for typical aero-elastic simulations of wind turbines. The spectral model enables the direct assessment of the additional impact of the inertia response control on wind turbines: the spectra of wind turbine output signals such as generator speed, tower base bending moment, and shaft torsional moment are calculated directly from the developed spectral model of the grid frequency and a commonly used spectral model of the turbulent wind. The calculation of output spectra is verified with non-linear time-domain simulations and spectral estimation. Based on this analysis, a notch filter is designed to significantly alleviate the negative impact on wind turbine’s structural loads due to the inertia response with only a small reduction on the grid support.https://www.mdpi.com/1996-1073/14/9/2492wind turbineinertia responsegrid frequencyspectral modelrate of change in frequency |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Feng Guo David Schlipf |
spellingShingle |
Feng Guo David Schlipf A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics Energies wind turbine inertia response grid frequency spectral model rate of change in frequency |
author_facet |
Feng Guo David Schlipf |
author_sort |
Feng Guo |
title |
A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics |
title_short |
A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics |
title_full |
A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics |
title_fullStr |
A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics |
title_full_unstemmed |
A Spectral Model of Grid Frequency for Assessing the Impact of Inertia Response on Wind Turbine Dynamics |
title_sort |
spectral model of grid frequency for assessing the impact of inertia response on wind turbine dynamics |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2021-04-01 |
description |
The recent developments in renewable energy have led to a higher proportion of converter-connected power generation sources in the grid. Operating a high renewable energy penetration power system and ensuring the frequency stability could be challenging due to the reduced system inertia, which is usually provided by the conventional synchronous generators. Previous studies have shown the potential of wind turbines to provide an inertia response to the grid based on the measured rate of change of the grid frequency. This is achieved by controlling the kinetic energy extraction from the rotating parts by its converters. In this paper, we derive a spectral-based model of the grid frequency by analyzing historical measurements. The spectral model is then used to generate realistic, generic, and stochastic signals of the grid frequency for typical aero-elastic simulations of wind turbines. The spectral model enables the direct assessment of the additional impact of the inertia response control on wind turbines: the spectra of wind turbine output signals such as generator speed, tower base bending moment, and shaft torsional moment are calculated directly from the developed spectral model of the grid frequency and a commonly used spectral model of the turbulent wind. The calculation of output spectra is verified with non-linear time-domain simulations and spectral estimation. Based on this analysis, a notch filter is designed to significantly alleviate the negative impact on wind turbine’s structural loads due to the inertia response with only a small reduction on the grid support. |
topic |
wind turbine inertia response grid frequency spectral model rate of change in frequency |
url |
https://www.mdpi.com/1996-1073/14/9/2492 |
work_keys_str_mv |
AT fengguo aspectralmodelofgridfrequencyforassessingtheimpactofinertiaresponseonwindturbinedynamics AT davidschlipf aspectralmodelofgridfrequencyforassessingtheimpactofinertiaresponseonwindturbinedynamics AT fengguo spectralmodelofgridfrequencyforassessingtheimpactofinertiaresponseonwindturbinedynamics AT davidschlipf spectralmodelofgridfrequencyforassessingtheimpactofinertiaresponseonwindturbinedynamics |
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