Examination of optimal installation of photovoltaic systems on low- and mid voltage distribution networks

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Dr. Hartmann Bálint
Department of Electric Power Engineering

The growing penetration of the photovoltaic (PV) systems in the distribution grid is inevitable as the example of the different European countries, like Italy and Germany, demonstrates. It has been realized already in these countries that ground must be provide for the PV based distributed generation, while the effects of the distributed generation on the power system are utilized and kept under control.

In my thesis I performed quasi-static load-flow simulations with the help of the DIgSILENT PowerFactory for investigating the effects of the PV systems on different distribution grid topologies. The purpose of these simulations was to determine a sizing and placement method for PV systems, which can not only reduce, but utilize the effects of the PV systems on the distribution grid. As a first step I searched for a sizing algorithm, which can minimize the total loss of the grid, while it keeps in mind the needs of the consumer of the PV system. Based on the results of this sizing method I compared the decentralized PV placement with the centralized PV placement to find the proper placement according to the effects caused by the consumer connected PV systems.

As a result of these steps, I realized that basically the question is not whether siting the PV systems centralized or decentralized, but siting the PV system to a commercial consumer or a household consumer. The answer for this question lies in the connection between the consumption profile and the PV production profile, consequently I created a factor for the description of this connection. As the completion of my thesis I compared my results with the methods used in practice and I presented some possibilities in improving the connection between the consumption profiles and the production profiles.


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