@article{Schulte, author = {Schulte, Horst}, title = {Uncertainty Quantification for Robust Control of Wind Turbines using Sliding Mode Observer}, series = {Journal of Physics: Conference Series}, volume = {753}, journal = {Journal of Physics: Conference Series}, number = {5}, publisher = {IOP Publishing}, issn = {1742-6588}, doi = {10.1088/1742-6596/753/5/052030}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:523-15559}, pages = {1 -- 10}, abstract = {A new quantification method of uncertain models for robust wind turbine control using sliding-mode techniques is presented with the objective to improve active load mitigation. This approach is based on the so-called equivalent output injection signal, which corresponds to the average behavior of the discontinuous switching term, establishing and maintaining a motion on a so-called sliding surface. The injection signal is directly evaluated to obtain estimates of the uncertainty bounds of external disturbances and parameter uncertainties. The applicability of the proposed method is illustrated by the quantification of a four degree-of-freedom model of the NREL 5MW reference turbine containing uncertainties.}, subject = {Windturbine}, language = {en} } @article{OrtbandtDzienisMatusseketal., author = {Ortbandt, Claudius and Dzienis, Cezary and Matussek, Robert and Schulte, Horst}, title = {Parameter Estimation in Electrical Power Systems Using Prony's Method}, series = {Journal of Physics: Conference Series}, volume = {659}, journal = {Journal of Physics: Conference Series}, number = {1}, publisher = {IOP Publishing}, issn = {1742-6588}, doi = {10.1088/1742-6596/659/1/012013}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:523-15562}, pages = {1 -- 12}, abstract = {This paper presents the basic principle of Prony's method, which is used for determining electrical power system parameters such as phasors, angular speeds as well as damping factors in a large frequency range. For fixed sampling frequencies, the approach to finding an optimal model order and to extracting transient parameters for further identification of different system effects is shown. Furthermore, it is shown that the method can be applied to the diverse plausibility checks for a confirmation of the result obtained using a conventional Fourier based approach. It will be presented that the significant advantage of the Prony algorithm in comparison to Fourier based methods is the possibility of computing an accurate frequency and in determining a damping factor.}, subject = {Prony-Verfahren}, language = {en} } @article{GauterinPoeschkeSchulte, author = {Gauterin, Eckhard and P{\"o}schke, Florian and Schulte, Horst}, title = {Global Versus Local Lyapunov Approach Used in Disturbance Observer-Based Wind Turbine Control}, series = {Frontiers in Control Engineering}, volume = {3}, journal = {Frontiers in Control Engineering}, publisher = {Frontiers Media S.A.}, issn = {2673-6268}, doi = {10.3389/fcteg.2022.787530}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:523-16716}, pages = {1 -- 23}, abstract = {This contribution presents a Lyapunov-based controller and observer design method to achieve an effective design process for more dedicated closed-loop dynamics, i.e., a maximal flexibility in an observer-based controller design with a large consistency in desired and achieved closed-loop system dynamics is intended. The proposed, pragmatic approach enhances the scope for controller and observer design by using local instead of global Lyapunov functions, beneficial for systems with widely spaced pole locations. Within this contribution, the proposed design approach is applied to the complex control design task of wind turbine control. As the mechanical loads that affect the wind turbine components are very sensitive to the closed-loop system dynamic, a maximum flexibility in the control design is necessary for an appropriate wind turbine controller performance. Therefore, the implication of the local Lyapunov approach for an effective control design in the Takagi-Sugeno framework is discussed based on the sensitivity of the closed-loop pole locations and resulting mechanical loads to a variation of the design parameters.}, subject = {Ljapunov-Methode}, language = {en} } @article{BoualiSchulteMami, author = {Bouali, Chaabane and Schulte, Horst and Mami, Abdelkader}, title = {A High Performance Optimizing Method for Modeling Photovoltaic Cells and Modules Array Based on Discrete Symbiosis Organism Search}, series = {Energies}, volume = {12}, journal = {Energies}, number = {12}, publisher = {MDPI}, issn = {1996-1073}, doi = {10.3390/en12122246}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:523-3920}, pages = {32}, language = {en} }