Impact assessment of e-mobility on LV distribution and HV transmission systems

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Supervisor:
Prikler László
Department of Electric Power Engineering

Load profile is well-known on a LV distribution feeder. However, charging of electric vehicles will have a yet unforeseen impact on the system which must be dealt with. The appearance and wide penetration of this new load-type may cause problems on the distribution as well as on the transmission system. DSOs will have to deal with overloading protection and also power quality issues.

Also, the electric vehicle batteries could discharge the stored electricity to the grid on demand, thus the electric vehicle storage could operate as a controllable load or distributed generator.

The thesis gives a brief summary of the main characteristics of electric vehicles, then follows with modeling and prediction of distribution system voltage distortion and load demand due to electric vehicle battery charging by means of computer simulation.

Based on queueing theory a simple model is constructed to study the aggregation of electric vehicle battery storage, which is termed as Vehicle-to-Grid systems. Vehicle-to-Grid systems could provide back up electricity storage as well as quick response generation to changes in the power balance of the electricity grid.

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