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A novel evaluation framework for energy losses in low voltage distribution grids
(kassel university press, 2020)
Decentralization of energy generation in power distribution systems is recognized as an important development strategy to incorporate more small-scale renewable sources, reduce greenhouse gas emissions and increase energy efficiency. Beside integrating more decentralized generators into existing systems, an efficient system operation is equally important to achieve an overall sustainable energy system. In order to keep track of upcoming changes regarding system efficiency, an accurate determination of energy losses ...
Buch
Cooperative intention detection using machine learning. Advanced cyclist protection in the context of automated driving
(kassel university press, 2021)
Cyclists will play an essential role in future traffic. It is crucial to detect cyclists and predict their intentions to avoid accidents and achieve a highly efficient traffic flow. Vehicles equipped with sensors, data processing systems, and communication abilities acquire and maintain a local model of their surrounding traffic environment, e.g., crossing cyclists. Cooperating and interacting vehicles, roadside units, and cyclists equipped with smart devices and other body-worn sensors exchange information.They form ...
Buch
Bausteine einer wertschätzenden Schulkultur
(kassel university press, 2020)
Die vorliegende Arbeit setzt sich am Beispiel der Georg-Christoph-Lichtenberg-Gesamtschule Göttingen tiefergehend mit dem Begriff der „Wertschätzung“ und der möglichen Wirkungsweise eines wertschätzenden Verhaltens auseinander. Ziel dieser Arbeit ist es gewesen, die wichtigsten Bausteine einer wertschätzenden Schulkultur herauszuarbeiten und zu definieren, sie für interessierte Pädagoginnen und Pädagogen zugänglicher zu machen und konkrete Handlungsanweisungen für ein wertschätzendes Miteinander im schulischen Kontext ...
Buch
Wind Power Ensemble Forecasting
(kassel university press, 2019)
This thesis describes performance measures and ensemble architectures for deterministic and probabilistic forecasts using the application example of wind power forecasting and proposes a novel scheme for the situation-dependent aggregation of forecasting models. For performance measures, error scores for deterministic as well as probabilistic forecasts are compared, and their characteristics are shown in detail. For the evaluation of deterministic forecasts, a categorization by basic error measure and normalization ...
Buch
Sizing and operation of residential photovoltaic systems in combination with battery storage systems and heat pumps
(kassel university press, 2018)
The thriving business case of residential photovoltaic systems in combination with battery storage systems and other flexibility options, such as heat pumps, leads to additional questions for PV network integration and increases the complexity of planning processes for all involved stakeholders – especially for investors and distribution network operators. In this thesis mixed integer linear and bilevel optimization models are developed for evaluating the interdependencies between these stakeholders and their strategic ...
Buch
Organische oberflächenemittierende Laser mit vertikaler Kavität: Entwicklung neuer Design- und Herstellungsansätze
(kassel university press, 2019)
Diese Arbeit behandelt die Herstellung organischer oberflächenemittierender Laser mit vertikaler Kavität für den blauen bis ultravioletten Spektralbereich. Das Ziel ist die Herstellung zweier verschiedener OVCSEL mit neuartigen Ansätzen im Laserdesign und der Prozessierung. Die aktive Region wird entweder durch Lithographie oder die nachträgliche Infiltration des organischen aktiven Materials in eine bestehende dielektrische Struktur lateral eingeschränkt. Bei letzterem Ansatz ist das organische Material als hochbrechende ...
Buch
Multi-Year Time-Series-Based power system planning with hybrid optimization and supervised learning methods
(kassel university press, 2021)
The increasing share of renewable energy sources (RES) in the power system necessitates new planning methods for power systems systems. On the one hand, flexible operational measures must be included in planning. On the other hand, conventional measures have to be considered. An integrated optimization of both measures is needed. This integrated optimization requires time series simulations of the power system in comparison to traditional worst case planning approaches.
The high voltage (HV) level has the highest ...
Buch
Optimizing Control of Distributed Cyber-Physical Systems
(kassel university press, 2021)
In this thesis, a set of modeling and control strategies are proposed for Cyber-physical systems (CPS), which aim at ensuring a safe, reliable, and highly performant operation of each local subsystem contained in the CPS. Modeling of CPS is challenging since not only must the tight interconnection of continuous and discrete dynamics of local subsystems be exactly represented, but so must also the interleaving structure between different subsystems. Optimal control of CPS, accordingly, should take into account not ...
Buch
Untersuchungen zum Einsatz leistungselektronischer Spannungsregler in Niederspannungsverteilnetzen mit hohem Anteil dezentraler Erzeugungsanlagen
(kassel university press, 2020)
Die steigende Stromerzeugung aus erneuerbaren Energien stellt das elektrische Energieversorgungssystem vor neue Herausforderungen. Für Verteilnetze mit zunehmender Durchdringung mit dezentralen Erzeugungsanlagen sind besonders Maßnahmen zur Spannungshaltung relevant. Systemkonzepte zur aktiven Spannungsregelung stellen hierbei Alternativen zu konventionellen Netzverstärkungsmaßnahmen dar. In dieser Arbeit wird daher der Einsatz von leistungselektronischen Spannungsreglern in aktiven Niederspannungsverteilnetzen ...
Buch
Design and Modeling of Semiconductor Terahertz and Infrared Sensing Structures for Protein Characterization
(kassel university press, 2020)
The subject area of biological sensing becomes progressively more attractive for medicine and fundamental biological research. In these fields, the investigation of characteristic fingerprints of membrane proteins is important, as they are responsible for the communication and activity of biological cells. Moreover, these complex structures are essential for the transport of various substances into the cell and are suitable as a drug target. These kinds of proteins provide vibrational resonances between 200GHz and 2 ...