48 research outputs found
Familiennamen an Niederrhein und Maas : von Angenendt bis Seegers/Zeegers /
No full text"In Zusammenarbeit mit dem LVR-Institut für Landeskunde und Regionalgeschichte"--Title page verso.Includes bibliographical references and index.Ursprung, Motivierung und Bildung von Familiennamen am Beispiel des neiderländischen Sprachgebiets / Von Ann Marynissen -- Von Angenendt über Derix, Janssen und Terlinden bis Elspass : Niederrheinische Familiennamen im Rahmen des Deutschen Familiennamenatlasses / Von Rita Heuser und Damaris Nübling -- Wie schreibt sich Seegers/Zeegers? : Einheimische Famliennamen beiderseits der Staatsgrenze zwischen Arnheim und Krefeld / Von Georg Cornelissen -- Familiennamengeografie im Internet am Beispiel des Internetportals "Westfälischen Familiennamentypen" / Von Robert Damme -- Zu einigen westfälischen Familiennamentypen / Von Hans Taubken -- Familiennamen und Genealogie / Von Elmar Neuss -- Namen in Romanen : Zur literarischen Verwendung regionaltypischer Personennamen im Werk niederrheinischer Autoren / Von Heinz Eickmans -- Register der Familiennamen
Organisational Structures in Network Industries – An Application to the Railway Industry
No full textThis paper analyses the incentives to upgrade input quality in vertically related (network) industries. Upstream investments have a biased effect on the downstream companies and lead to vertical product differentiation. Different vertical structures such as vertical integration, ownership and legal unbundling lead to different investments. We find that, without regulation, vertical integration and legal unbundling regimes provide highest investment incentives and lead to highest welfare. However, we also find foreclosure in the downstream market if the potential degree of horizontal product differentiation of the entrant is low. Under ownership unbundling, investment incentives are lower but there is never foreclosure of the entrant since this would worsen double marginalisation. When the network operator is subject to a break-even regulation, the investment incentives are crowded out under legal and ownership unbundling whereas they remain nearly unchanged under vertical integration. Welfare and co umer surplus decrease under legal unbundling, but increase under the two other regimes.Vertical Integration, Investment, Foreclosure, Regulation
Identification and Discussion of parameters that can be used to analyze industries with Michael E. Porter's system of determinants that influence the competitive position of nations' industries
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Operation, optimization and additional market participation of households with PV battery storage system and power-to-heat application
No full textSector coupling allows the use of electricity from renewable sources in different sectors to reduce their greenhouse gas emissions. Among others, renewable electricity from domestic photovoltaic systems can be used in the heating sector through power-to-heat coupling. The power generated by the photovoltaic system is then used for space heating as well as hot water preparation. In this dissertation, a detailed simulation model of an integrated home consisting of a photovoltaic system, a battery storage and power-to-heat coupling is developed to investigate cost reduction potentials. Cost reduction can be achieved by advanced operation strategies, optimization of the component sizes and market participation.Operation strategies: This thesis presents advanced operation strategies for the electrical and thermal system and examines the gain in efficiency by combined operation strategies. Forecast-based operation strategies that reduce battery aging and costs are developed and compared to state-of-the-art operation strategies. The results of the thesis indicate that advanced operation strategies can reduce the annual costs of photovoltaic battery energy storage systems up to 12 %.Optimization of component sizes: The most important aspect to improve the economics of integrated homes is system sizing. Dimensioning of the different system components heavily influences the economics of photovoltaic battery storage systems with power-to-heat coupling. The thermal and electrical load profile as well as the solar radiation profile must be considered to find optimal component dimensions. An optimization tool is presented that finds the most economic sizing for each system component. The results indicate that integrated homes with optimized component sizes and advanced operation strategies are economically competitive to households with fossil heating concepts. Additional market participation: During winter, storage systems in integrated homes are not used to their full capacity due to the low solar irradiation. These unused capacities can be used to improve the economics of integrated homes by implementing a second-use scheme. Second-use describes the value stacking of home storage operation and participation on energy markets, e.g. the control reserve market. Besides enhanced economics, a participation in the control reserve market can improve grid stability and hence support further integration of renewable energies. A major advantage of integrated homes with power-to-heat coupling in comparison to standalone battery storage is the additional flexibility to absorb the negative control reserve power, provided by the heating sector. This allows an extension of the operating limits of a power-to-heat coupled battery. This thesis presents a dual-use operation of an integrated home participating in the primary and secondary control reserve markets. Results show that a dual-use operation can increase the profitability of residential storage systems. The economics of the market participation are highly sensitive to numerous factors. Participating on the negative secondary control reserve market can lead to reduced annual cost up to 14.5 % in the investigated scenario. These savings are mainly driven by “free-of-charge” energy. If a system participates on the primary control reserve market, savings are mainly driven by additional revenues from market remuneration. Annual net cost reductions of up to 12.5 % are possible
Economic-ecological modelling of climate-relevant emissions from agriculture at regional level
No full textRezension. Arnold Angenendt, Toleranz und Gewalt. Das Christentum zwischen Bibel und Schwert, Münster 2007
No full textUnveröffentlichte Rezension; im Juni 200
Participating in the control reserve market with PV battery energy storage systems and power-to-heat application
No full textEnhancing Battery Lifetime in PV Battery Home Storage System Using Forecast Based Operating Strategies
No full textAbstractAn increase of self-consumption from domestic photovoltaic (PV) can be gained by the use of PV battery energy storage systems (PV-BESS). PV-BESS are currently just at the edge of profitability. Intelligent operating strategies might further increase the economy of these systems. This paper presents a novel approach for an operating strategy for PV-BESS which is able to increase the lifetime of lithium-ion batteries in such systems without reducing the self-consumption rate significantly. The operating strategy is evaluated by simulations, using a model of a DC-coupled PV-BESS and real data measurements as model inputs. To enhance the lifetime of the system, the average state of charge (SOC) of the battery is reduced by storing only the amount of energy predicted to be needed during the following night. With the applied approach, begin of night is defined as the point when the residual load becomes negative and accordingly, end of night is defined as the point when the residual load becomes positive again. This strategy is only applied in the summer months to use the full potential of the storage system during the winter. Using this strategy, seasonal effects like high average SOCs during summer will be reduced. For the necessary prediction, perfect forecast (best case) and persistence forecast (worst case) are evaluated to investigate the influence of prognosis inaccuracies. To minimize losses in self-consumption, not only a forecast for the next night will be considered but a variation of forecast periods is discussed. In conclusion, the results show that the application of such an operating strategy can increase battery lifetime significantly while affecting the self-consumption rate only slightly. Consequently, this operating strategy shows a high potential to increase the profitability of a PV-BESS
