Learning the use of DigSilent Power Factory, and implementation of an all-in-one power system

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Supervisor:
Dr. Hartmann Bálint
Department of Electric Power Engineering

Germany is amongst the world leaders of renewable energy research, development and deployment. By the middle of 2013 the country’s installed photovoltaic (PV) capacity reached 35.65 GW, which is unprecedented considering the fact that 69% of this capacity is located on the low voltage network. The share of intermittent energy sources is expected to keep rising in the future, as the so-called “Energiewende” is targeting 80% renewable energy share of gross electricity consumption by 2050.

With distributed generation appearing at the end-user the conventional power flow directions change and it poses a great challenge to the existing grid infrastructure. One possible way to mitigate these problems is by making the current grid “smarter”, one such smart feature can be the deployment of distributed energy storage units. From January 2013 the German state is also subsidising the installation of energy storages to existing photovoltaic systems up to 30 kWp power. Energy storage enables us to balance the generation characteristics of intermittent sources and to provide considerable grid support.

The aim of this thesis is to investigate the effects of solar-storage systems to a low voltage grid layout and to create a potent storage analysis framework in the programming language of DIgSILENT PowerFactory that may be later utilised by the German host institute within the frames of a research project. The resulting script is notably flexible, it can operate on any grid configuration and highly customisable. In this framework four different storage strategies were also implemented and thoroughly investigated. The performed simulations include the analysis of network losses, voltage deviations and overloading of network elements using the four strategies in two different scenarios; today and in 2030. The effect of different storage and PV penetration levels were also investigated using parameter variation. The simulation results fall in line with the findings in literature. Future developments include analysis of other grid layouts and implementation of new strategies.

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