Publikationen

Simplified dynamic inflow for control engineering models

Geisler, J. (2022). Simplified dynamic inflow for control engineering models. In Torque 2022. Delft: IOP Publishing. http://doi.org/10.1088/1742-6596/2265/3/032101 (Original work published 05/2022)

Abstract

Simplified turbine models are needed wherever computational resources are limited and the model needs to run in real-time or faster, or when it is used in analytical procedures such as linearization. These use cases are typically given in control engineering applications, especially advanced methods such as nonlinear model predictive control or state estimation. Many such models with varying levels of detail have been proposed, but most of them rely on a quasi-stationary, rotor averaged/effective representation of aerodynamic forces. Unsteady aerodynamic effects such as dynamic inflow (sometimes referred to as dynamic wake) or dynamic stall are usually neglected. But with ever more advanced methods more detailed yet still computationally efficient models are needed. Therefore, this work proposes an approach for adding the effect of dynamic inflow to any rotor effective force or moment that was previously modeled as quasi-stationary. Novel to this work is the suitability for nonlinear as well as linear models and a focus on computational efficiency while still optimally recreating the effect.
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A symbolic framework to obtain mid-fidelity models of flexible multibody systems with application to horizontal-axis wind turbines

Branlard, E., & Geisler, J. (2022). A symbolic framework to obtain mid-fidelity models of flexible multibody systems with application to horizontal-axis wind turbines. Wind Energy Science, 7, 2351-2371. http://doi.org/10.5194/wes-7-2351-2022

Abstract

The article presents a symbolic framework (also called computer algebra program) that is used to obtain, in symbolic mathematical form, the linear and nonlinear equations of motion of a mid-fidelity multibody system including rigid and flexible bodies. Our approach is based on Kane's method and a nonlinear shape function representation for flexible bodies. The shape function approach does not represent the state of the art for flexible multibody dynamics but is an effective trade-off to obtain mid-fidelity models with few degrees of freedom, taking advantage of the separation of space and time. The method yields compact symbolic equations of motion with implicit account of the constraints. The general and automatic framework facilitates the creation and manipulation of models with various levels of complexity by adding or removing degrees of freedom. The symbolic treatment allows for analytical gradients and linearized equations of motion. The linear and nonlinear equations can be exported to Python code or dedicated software. There are multiple applications, such as time domain simulation, stability analyses, frequency domain analyses, advanced controller design, state observers, and digital twins. In this article, we describe the method we used to systematically generate the equations of motion of multibody systems and present the implementation of the framework using the Python package SymPy. We apply the framework to generate illustrative land-based and offshore wind turbine models. We compare our results with OpenFAST simulations and discuss the advantages and limitations of the method. The Python implementation is provided as an open-source project.
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  Geisler, Jens
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  Erneuerbare Energien und nachhaltige Entwicklung
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  Fachbereich 2: Energy and Life Science
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Symbolic Flexible Multibody Models for Wind Turbine Controller Design and Analysis

Geisler, J., & Branlard, E. (2021). Symbolic Flexible Multibody Models for Wind Turbine Controller Design and Analysis. Hannover / Online: Wind Energy Science Conference. http://doi.org/10.5281/zenodo.5148447 (Original work published 05/2021)
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A Familie of Simplified Aerodynamic Models for Wind Turbine Controller Design and Analysis

Geisler, J. (2021). A Familie of Simplified Aerodynamic Models for Wind Turbine Controller Design and Analysis. Hannover / Online: Wind Energy Science Conference. http://doi.org/10.5281/zenodo.5148441 (Original work published 05/2021)
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Verfahren zum Betreiben einer Windenergieanlage und Steuerung für eine Windenergieanlage DE102017009985

Geisler, J., & Frahm, S. (2019). Verfahren zum Betreiben einer Windenergieanlage und Steuerung für eine Windenergieanlage DE102017009985. Germany: Senvion GmbH. (Original work published 05/2019)
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Steuerungssystem und Verfahren zum Betreiben mehrerer Windenergieanlagen DE102017009838

Geisler, J., & Schmuck, J. (2019). Steuerungssystem und Verfahren zum Betreiben mehrerer Windenergieanlagen DE102017009838. Germany: Senvion GmbH. (Original work published 04/2019)
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Steuerungssystem und Verfahren zum Betreiben einer Mehrzahl von Windenergieanlagen DE102017009837

Geisler, J., & Schmuck, J. (2019). Steuerungssystem und Verfahren zum Betreiben einer Mehrzahl von Windenergieanlagen DE102017009837. Germany: Senvion GmbH. (Original work published 04/2019)
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Nichtlineare, ökonomische Modellprädiktive Regelung für die prototypische Erprobung auf einer Windkraftanlage

Geisler, J. (2019). Nichtlineare, ökonomische Modellprädiktive Regelung für die prototypische Erprobung auf einer Windkraftanlage. RWTH Aachen: Vortragsreihe "Beiträge zur Regelungstechnik". (Original work published 02/2019)
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Leistungsreduktion bei mehreren Windenergieanlagen in einem Windpark DE102017006452

Geisler, J. (2019). Leistungsreduktion bei mehreren Windenergieanlagen in einem Windpark DE102017006452. Germany: Senvion GmbH. (Original work published 01/2019)
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Bereitstellen von Regelleistung beim Betrieb einer regenerativen Stromerzeugungseinheit, insbesondere Windenergieanlage DE102017007132

Geisler, J. (2019). Bereitstellen von Regelleistung beim Betrieb einer regenerativen Stromerzeugungseinheit, insbesondere Windenergieanlage DE102017007132. Germany: Senvion GmbH. (Original work published 01/2019)
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