This paper describes a joint research project in the field of grid integration of distributed renewable energy sources. Several research groups cooperate in an interdisciplinary approach. Main focus of this research project is the analysis of both influence and possibilities of multi-agent systems (MAS) which control consumers and renewable energy resources (RES) in future energy systems. Analysis and solutions are provided in the fields of control of power electronics that connects the RES to the grid and the interaction between multiple renewable energy resources in the grid. A detailed modelling of the connecting distribution and overlaying transmission networks is used for the analysis of distributed generation systems and their influence on the different voltage levels of the power grid. A combined simulation environment for different scenarios of single distribution grids controlled by MAS and the overlaid transmission grid in an overall system model has been developed, so both grid areas can be analysed in adequate accurateness. Furthermore the integration of grid and power market in one simulation environment is extended for analyses of frequency stability.

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Zusammenfassung: Der zunehmende Ausbau regenerativer Energieumwandlungsanlagen im elektrischen Energieversorgungssystem führt zu einer Verringerung der residualen Last und damit zu einer Verdrängung konventioneller Groẞkraftwerke. Neben der Aufgabe, Leistung im Lastfolgebetrieb auf Basis von Fahrplänen bereitzustellen, übernehmen diese Kraftwerke bislang die kritische Aufgabe der Frequenz-und Spannungsregelung im Stromnetz. Bei einem Ersatz der Kraftwerke durch dezentrale dargebotsabhängige Erzeugungsanlagen müssen diese in der Lage sein, die Frequenz-und Spannungsregelung zu über-nehmen. In diesem Beitrag wird ein Verfahren vorgestellt, mit denen sich Verbünde solcher Anlagen zur zuverläs-sigen Bereitstellung von Primärregelleistung heranziehen lassen.Schlüsselwörter: Smart Grids, dezentrale Betriebsfüh-rung, Systemdienstleistungen, dynamische Stabilität, Umrichter.Abstract: The increase in renewable power generation causes an overall decrease in conventional power generation from large-scale and highly predictable fossil-fuel power plants. Aside from market-based provision of active power schedules, these power plants are crucial for the provision of short-term automatic ancillary services such as frequency and voltage control. Substituting these plants for renewable generation units requires the latter to be capable of providing these ancillary services in order to guarantee a reliable and stable power supply. In this paper the authors present an integrated approach for identifying distributed coalitions of agents representing units capable of providing frequency response reserve while taking into account opportunity costs, device specific reliabilities (e. g. for photovoltaic or wind installations) as well as the smallsignal stability of such coalitions.