Suche
Anzeige der Dokumente 1461-1470 von 1976
Buch
Charakterisierung der Schaltverluste diskreter Wide Band Gap Leistungshalbleiter und Entwärmung kompakter Bauteile
(kassel university press, 2021)
Die Verwendung von Wide Band Gap-Halbleitern stellt Anforderungen an die Verlustmessung und die Entwärmung einer Schaltung, welche mit herkömmlicher Technik nur unzureichend zu erfüllen sind. In dieser Arbeit wird eine Methode entwickelt, die eine Abschätzung des relativen Fehlers der Strommessung im Doppelpulstest ermöglicht. Mit ihr werden anschließend verfügbare Sensoren untersucht und eine neue Variante vorgeschlagen. Außerdem wird eine Entscheidungshilfe erstellt, mit der die Auswahl eines geeigneten Stromsensors ...
Buch
Auswirkungen hoher erneuerbarer Energieanteile auf städtische Stromnetze unter Berücksichtigung der Fernwärmeinfrastruktur
(kassel university press, 2021)
Die Energie-, Wärme- und Verkehrswende kann eine Herausforderung für die städtische Netzinfrastruktur werden.
Um die Auswirkungen vor allem auf die Niederspannungsnetze in städtischem und stadtnahem Umfeld beurteilen zu können, wird in dieser Dissertation die Auswirkung einer vollumfassenden Energiewende aufgezeigt. Die ausgesuchten Niederspannungsnetze sind als typische Netze in der Region Köln zu betrachten. In einem ersten Schritt wird davon ausgegangen, dass in den zu untersuchenden Niederspannungsnetzen alle ...
Buch
Off-Board Car Diagnostics Based on Heterogeneous, Highly Imbalanced and High-Dimensional Data Using Machine Learning Techniques
(kassel university press, 2019)
Data-driven maintenance poses many challenges. Four very important of them, namely coping with a high dimensional and heterogeneos feature space, the highly imbalanced data sets, the Remaining Useful Lifetime (RUL) prediction of monitored parts based on short yet variable length timeseries, and already large but steadily further increasing data set size are identified. Each of the challenges is dealt with in one chapter. Novel techniques are designed, implemented, validated, and compared to existing approaches based ...
Buch
Fast Online Control based on Homotopies for Systems subject to Time-Varying Constraints
(kassel university press, 2020)
The integration of intelligent, autonomously acting systems into modern society is a rapidly growing field. After robots are established for simple, recurring processes in industry and everyday life, more complex tasks are of interest which require the systems to consider the environment in their decision making process. In the future, intelligent systems will get access to fields like autonomous driving cars, unmanned aerial vehicle (UAV), manufacturing processes, household, or the assistance to people in need of ...
Buch
Performance Assessment of Residential PV Battery Systems
(kassel university press, 2021)
Declining costs for high-performance batteries are leading to worldwide increased use of storage systems in residential building. Especially in conjunction with reduced photovoltaic (PV) feed-in tariffs, a large market has developed in Germany for PV battery systems to increase self-sufficiency. Presently, more than 120,000 PV battery systems are operating in German households. They differ significantly in the type of coupling between PV and battery, the nominal capacities of their components, and their degree of ...
Buch
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 ...