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Unformatted text preview: 1 DISTRIBUTED GENERATION – NEW TECHNICAL SOLUTIONS REQUIRED IN THE DISTRIBUTION SYSTEM Kimmo Kauhaniemi University of Vaasa and VTT Processes,Finland firstname.lastname@example.org Risto Komulainen VTT Processes, Finland email@example.com Lauri Kumpulainen VTT Processes, Finland firstname.lastname@example.org Olof Samuelsson Lund University, Sweden email@example.com ABSTRACT The share of distributed generation (DG) is expected to grow rapidly in near future. In addition to the environmental aspects also the shorter construction period can be considered as a key driving force accelerating the development. However, there are also some severe barriers before wider employment of DG is possible. One of them is the connection to network or grid. Especially when we consider distribution networks the situation is totally new since traditionally there are practically no production units connected in the distribution network. For this purpose new rules and recommendations are needed. Furthermore, new technical solutions are necessary to make DG economically more viable. This paper is based on Nordic research project CODGUNet, where the issues relating to the interconnection of DG units were studied. In this paper different DG technologies are briefly introduced focusing on network interconnection. After that the impact of DG on the distribution network is evaluated considering the issues relating to system operation, control, and protection as well as power quality. At the end of the paper some key development areas in the distribution system are pointed out, considering the new requirements arising from the increased share of DG. INTRODUCTION Different kinds of distributed energy generation technologies are developed world wide with large R&D budgets. Typical for these technologies are a great number of production units, which are small in size (from 10 kW up to about 10-20 MW) and located near the consumption of energy. These units produce often electricity for a certain end-user. In CODGUNet project DG means generation connected to the distribution network or on the customer side of the meter, size not more than 20 MW and 24 kV voltage levels . One main idea of these units is that while the consumption of the end-user increases, additional electricity is taken from the distribution network and when the consumption decreases, the generation unit may provide electricity to the network. From distributed generation technologies especially wind power has already been largely applied, but also other technologies, such as gas, diesel and biomass fired micro and mini turbines and CHP devices, solar cell systems etc., are in the phase of commeration....
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