Impact assessment of electric car charging on LV grids, possibility of charging on the public lighting network

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Dr. Farkas Csaba
Department of Electric Power Engineering

One of today’s most important global problem is the pollution and the global warming caused by the pollutants and the greenhouse gases emitted by human activities. In the European Union around 20% of the emitted carbon dioxide is originated from the transportation which is the only significant sector where the amount of emission is still increasing. In favour of the sustainability the Union’s goals include the decreasing emission in the member states. Changing petrol vehicles to electric ones can be the starter point to accomplish this aim. Based on the trends in Europe, in long term we need to take in consideration that the electric cars will become an essential part of the sustainable transportation, therefore the adequate charger infrastructure will need to be provided. Although, due to the charging of electric cars, new types of consumers will appear on the power system, which will enhance the energy demand, modify the daily load curves, all of which will have an impact on the loading of the network elements.

In this thesis, the different charging methods and their possible effects on the power system is presented. These impacts are for instance, the overloading of the elements - cables, transformers - or the inadequate voltage level and the asymmetry according to the standards. To analyse the impacts on the low voltage electric grid, DIgSILENT Powerfactory program was used. Several parts of the power system were designed where increasing electric car penetration was examined on how it affects the different parameters mentioned above. Analysing the results solutions were made for future charging methods in order to tackle problems that may occur.

Finally, since the current European law says that electric car charging will have to be provided in parking lots however, a newly constructed infrastructure would be rather expensive, an alternative solution was needed. Therefore the possibility of using Budapest’s modified public lighting cable network was investigated if it could supply the specified number of chargers demanded by the law.


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