Publikationen

2021

• Influence of Continuous Provision of Synthetic Inertia on the Mechanical Loads of a Wind Turbine

  Gloe, A. ., Jauch, C. ., Craciun, B. ., Zanter, A. ., & Winkelmann, J. . (2021). Influence of Continuous Provision of Synthetic Inertia on the Mechanical Loads of a Wind Turbine. Energies, 14(16), 5185. http://doi.org/10.3390/en14165185

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  In many electrical grids, the share of renewable energy generation increases. As these generators are typically connected to the grid via inverters, the level of grid inertia decreases. Such grids may therefore suffer from high rates of change of frequency during power imbalances. Modern wind turbines can help in controlling the frequency in such grids by providing synthetic inertia. A controller to provide synthetic inertia with wind turbines was developed at the Wind Energy Technology Institute in collaboration with Suzlon Energy. For this controller the influence of providing synthetic inertia on the mechanical loads of the wind turbine is assessed for different grid frequency scenarios. Such a scenario-based load analysis has not been published before, especially as the scenarios are derived from real measurements. The effect of the loads strongly depends on the analyzed grid frequency behavior. Ten months of high quality grid frequency measurements of the Indian grid are analyzed in order to derive inputs for the load calculation. Different types of grid frequency abnormities are identified and categorized with respect to their severity. Based on the observed occurrences of the grid frequency abnormities, realistic scenarios for the load calculations are chosen. The load calculations are performed for a state-of-the-art Suzlon wind turbine generator. The load increases caused by the supply of synthetic inertia are calculated for individual components assuming an otherwise undisturbed power production of the wind turbine in turbulent wind. Furthermore, a hardware-in-the-loop test bench is used to show how the measured grid frequencies are actually perceived by the control system of a typical wind turbine. The original frequency data were recorded with high quality measurement equipment, which is faster and more accurate than a multi-function relay, often used in wind turbines. For exemplary time traces, the effect of the reduced measurement accuracy on the reaction of the wind turbine is shown. This aspect has not been investigated in the literature yet. The results show that wind turbines can provide synthetic inertia without a considerable effect on the lifetime of the wind turbine. However, there are still problems with providing synthetic inertia reliably at high power operating points, which have to be solved.

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  • Personenseiten

    • Gloe, Arne
    • Jauch, Clemens

  • Abteilung/Einrichtung

    • Wind Energy Technology Institute

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2021
  • Journal Article
  • • Arne Gloe
    • Prof. Dr. Clemens Jauch
    • B. Craciun
    • Arvid Zanter
    • J. Winkelmann
  • • WETI

• Grid Frequency Data - WETI

  Thiesen, H. ., Gloe, A. ., & Jauch, C. . (2021). Grid Frequency Data - WETI. https://osf.io/jbk82/: Open Science Framework. http://doi.org/10.17605/OSF.IO/JBK82

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  Grid Frequency Data - WETI Overview Data type: grid frequency data File type: CSV Location of measurement: Flensburg, Germany Resolution: ~ 6.1Hz Measurement precision: 3 decimal Decription The presented grid frequency data is part of research activities at the Wind Energy Technology Instiute (WETI) at the Flensburg University of Applied Sciences. The measurement campaign is conducted in Flensburg, Germany. Hence, the grid frequency of the synchronous area of Continental Europe is tracked. A Dewetron 2010 measurement system is used to record and compute the data. The measurement system computes the grid frequency by tracking the grid voltage with a high sampling rate of 50 kHz. Every 164 ms the software fits a sinusoidal curve into the recorded voltage measurement points using the least-square-sums approach. The period of the resulting sinusoidal function is used as a measure for grid frequency. Data Structure Each csv-file provides data for one month of the year. Data is structured as follows: Column 1: Year of type integer Column 2: Month of type integer Column 3: Day of type integer Column 4: Hour of type integer Column 5: Minute of type integer Column 6: Second and Milliseconds of type float Column 7: Deviation of the nominal grid frequency in Hz of type float

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  • Abteilung/Einrichtung

    • Wind Energy Technology Institute

  • Profilbereich

    • Erneuerbare Energien und nachhaltige Entwicklung

  • Forschungsfeld

    • Netzintegration

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2021
  • Database
  • • Henning Thiesen
    • Arne Gloe
    • Clemens Jauch

• Context checklist for industrial software engineering research and practice

  Petersen, K. ., Carlson, J. ., Papatheocharous, E. ., & Wnuk, K. . (2021). Context checklist for industrial software engineering research and practice. Computer Standards \& Interfaces, 78, 103541.

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  • Personenseiten

    • Petersen, Kai

  • Abteilung/Einrichtung

    • FLAIR - Flensburg Artificial Intelligence Research

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  • 2021
  • Journal Article
  • • Kai Petersen
    • Jan Carlson
    • Efi Papatheocharous
    • Krzysztof Wnuk

• Does it pay for new firms to be green? An empirical analysis of when and how different greening strategies affect the performance of new firms

  Neumann, T. . (2021). Does it pay for new firms to be green? An empirical analysis of when and how different greening strategies affect the performance of new firms. Journal of Cleaner Production, 317, 128403. http://doi.org/https://doi.org/10.1016/j.jclepro.2021.128403

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  Despite the significant attention devoted to the impact of corporate greening strategies on firm performance, research has so far focused on established firms, leaving the situation in new firms unclear. In this study, it is hypothesised that the impact of greening strategies on the performance of new firms depends on the type of strategy, and that the firm s age positively moderates this impact. Using a cross-sectoral dataset of 11,039 new firms from 36 countries, binary and ordinal logistic regressions were estimated for different start-up phases. The results indicate that new firms benefit from substantive greening strategies but, contrary to expectations, not from symbolic greening strategies. The performance of new firms in their later start-up phases was even found to be harmed if they adopt symbolic strategies but do not reinforce them with substantive actions (green-washing). No impact, or only a weakly positive impact was found for firms adopting both substantive and symbolic greening strategies (green-highlighting) or only substantive ones (brown-washing). Furthermore, the interaction analyses did not reveal any moderating effects of firm age, but additional investigation shows that the impacts of greening strategies do differ between age groups. Finally, robustness tests reveal that the relationship between substantive greening strategies and the performance of new firms is not linear but decreases with increasing environmental efforts.

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  • Forschungsprojekt

    • StartUP SH

  • Abteilung/Einrichtung

    • Jackstädt-Zentrum Flensburg (JZF)

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2021
  • Journal Article
  • • Thomas Neumann
  • • Entrepreneurship
    • Start-up
    • Substantive vs symbolic greening
    • Greenwashing
    • Brownwashing
    • Age

• Willemers Informatik-Ecke http://www.willemer.de/informatik

  Willemer, A. . (2021). Willemers Informatik-Ecke http://www.willemer.de/informatik. http://www.willemer.de/informatik: Arnold Willemer.

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  • Personenseiten

    • Willemer, Arnold

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2021
  • Website
  • • Arnold Willemer

• Ciona intestinalis in the spotlight of metabolomics and microbiomics : New insights into its invasiveness and the biotechnological potential of its associated microbiota

  Utermann, C. ., Tasdemir, D. ., & Labes, A. . (2021). Ciona intestinalis in the spotlight of metabolomics and microbiomics : New insights into its invasiveness and the biotechnological potential of its associated microbiota (S. Online-Ressource). Kiel: Universitätsbibliothek Kiel.

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  • 2021
  • Book
  • • Caroline Utermann
    • Deniz Tasdemir
    • Antje Labes

• A virtual reality game to support visuospatial understanding of medical X-ray imaging

  Lenz, F. ., Fock, M. ., Kramer, T. ., Petersen, Y. ., & Teistler, M. . (2021). A virtual reality game to support visuospatial understanding of medical X-ray imaging. In 2021 IEEE 9th International Conference on Serious Games and Applications for Health (SeGAH). Dubai, United Arab Emirates.

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  • Personenseiten

    • Teistler, Michael

  • Forschungsprojekt

    • Entwicklung und praktischer Einsatz virtueller und spielbasierter Lernsysteme in der medizinischen Bildgebung

  • Abteilung/Einrichtung

    • CIVU – Center for Interaction, Visualization and Usability

  • Profilbereich

    • Informatik und Gestaltung

  • Forschungsfeld

    • Digitalisierung im Gesundheitswesen
    • Human-Computer-Interaction

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2021
  • Conference Paper
  • • Finn Lenz
    • Marie Fock
    • Timo Kramer
    • Yannik Petersen
    • Michael Teistler

• Automizing the manual link in maritime supply chains? An analysis of twistlock handling automation in container terminals

  Kugler, M. ., Brandenburg, M. ., & Limant, S. . (2021). Automizing the manual link in maritime supply chains? An analysis of twistlock handling automation in container terminals. Maritime Transport Research, 2, 100017. http://doi.org/https://doi.org/10.1016/j.martra.2021.100017

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  The study at hand elaborates on potential barriers, prerequisites and optimization potentials for the automation of the twistlock handling process in container terminals. A case analysis enlightens latest automation developments of this essential task in container transport. Eight experts from different organizations in maritime logistics and seaport operations were interviewed in a qualitative multiple-case research design. The interviews were evaluated by qualitative-quantitative content analysis with MAXQDA software. Automated twistlock handling systems are hardly implemented, although they represent the missing link between other container handling technology in the automated container transport. The study reveals that most implementation barriers consist of technological issues, followed by economic and strategic barriers. The study identifies implementation strategies and their key success and shows that safety improvements and cost reductions are major benefits of this automation. An innovation framework for this field of automation is conceptualized as scientific contribution. Practical implications include recommendations for relevant stakeholders in container logistics.

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  • Personenseiten

    • Brandenburg, Marcus

  • Fachbereich

    • Fachbereich 4: Wirtschaft
    • Fachbereich 1: Maschinenbau, Verfahrenstechnik und Maritime Technologien

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  • 2021
  • Journal Article
  • • Michael Kugler
    • Marcus Brandenburg
    • Sander Limant
  • • Container logistics
    • Maritime logistics
    • Process automation
    • Twistlock handling
    • case study
    • Expert interviews

• Integration unterirdischer Speichertechnologien in die Energiesystemtransformation am Beispiel des Modellgebietes Schleswig-Holstein - ANGUS II : Schlussbericht zum Verbundvorhaben Teilprojekt Simulation energietechnischer Einzelanlagen

  Boysen, C. ., Kaldemeyer, C. ., Sadat, F. ., Tuschy, I. ., Witte, F. ., Bauer, S. ., & Dahmke, A. . (2021). Integration unterirdischer Speichertechnologien in die Energiesystemtransformation am Beispiel des Modellgebietes Schleswig-Holstein - ANGUS II : Schlussbericht zum Verbundvorhaben Teilprojekt Simulation energietechnischer Einzelanlagen. Hochschule Flensburg. Abgerufen von https://www.tib.eu/de/suchen/id/TIBKAT%3A1798315475

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  • Personenseiten

    • Tuschy, Ilja
    • Witte, Francesco

  • Profilbereich

    • Erneuerbare Energien und nachhaltige Entwicklung

  • Forschungsfeld

    • Wärme
    • Netzintegration

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2021
  • Miscellaneous
  • • Cynthia Boysen
    • Cord Kaldemeyer
    • Fahim Sadat
    • Ilja Tuschy
    • Francesco Witte
    • Sebastian Bauer
    • Andreas Dahmke

• Software-in-the-Loop Simulation of a Gas-Engine for the Design and Testing of a Wind Turbine Emulator

  Rohr, A. ., & Jauch, C. . (2021). Software-in-the-Loop Simulation of a Gas-Engine for the Design and Testing of a Wind Turbine Emulator. Energies, 14. http://doi.org/10.3390/en14102898

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  In order to investigate the grid integration of wind turbines (WT) of various scales and designs, a wind turbine emulator (WTE) is being built in Flensburg within the state-funded project GrinSH. The special feature of this WTE is the use of a large gas engine instead of an electric motor to emulate the behavior of a WT. In order to develop the controls of this innovative WTE and to design the upcoming test runs under safe conditions, a software in the loop model (SILM) was applied. This SILM contained a mathematical model of the wind turbine, mathematical models of the gas engine with an integrated controller, and a model of the generator and frequency converter unit, as well as a preventive modulator of the reference signal (PMRS). The PMRS module converts the reference signal of the emulated WT in such a way that the dynamics of the engine components can be calculated and balanced in advance to enable the required behavior of the entire SILM despite the dynamics of the gas engine. It was found that the PMRS module, developed and tested in this work, increased the ability of the WTE, based on a gas engine, to reproduce the dynamics of a WT.

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    • Rohr, Alexander
    • Jauch, Clemens

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  • 2021
  • Journal Article
  • • Alexander Rohr
    • Prof. Dr. Clemens Jauch