Nüßler, Ariette (2012) Congestion and Redispatch in Germany. A model-based analysis of the development of redispatch. PhD thesis, Universität zu Köln.
In this dissertation a model to analyze the impact of recent developments of the electricity market on the national high-voltage transmission network from an economic perspective is developed. The purpose is to design a tool that allows including the costs induced on the network into an economic assessment in order to obtain a complete economic picture. In order to allow a reasonable application to the German electricity system and respective inferences, the concept of cost-based redispatch for network congestion relief is modeled. Furthermore, the concept of PTDF matrixes is integrated into the linear dispatch model DIANA thereby modeling the physical characteristics of electricity transmission. The model is applied to the prospective development of the German electricity system by use of a scenario analysis. By this means, the development of redispatch costs and quantities in Germany in the prospective years are highlighted. It can be shown that despite investments in the transmission infrastructure, the costs and quantities of redispatch increase in the course of time. Although the magnitude of this increase varies from scenario to scenario, a general trend of increasing costs and quantities can be observed for all scenarios. Moreover, the foreseeable development of the electricity market makes network extensions indispensable. Such network extensions, however, should not only be evaluated from a technical perspective, but should also be judged economically. As shown, the developed model can be used for such an economic assessment of investments in the transmission infrastructure. Finally, the model results show that the current German market design of cost-based redispatch becomes insufficient for resolving congestion from a technical perspective. The use of dummy redispatch in the model herbey indicates a regional shortage of generation capacity available for redispatch (or the need to curtail demand). As a consequence, the results in this dissertation reveal the necessity to change the market design in the future (e.g. by introducing price regions or a capacity market for redispatch) in order to guarantee a secure and stable functioning of the electricity system.
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