Event under the auspices of the Ministry of Economy of Slovak Republic

Algorithm-based analysis for the charging stations impact evaluation on the low-voltage distribution networks

Larisa Grackova
Institute of Physical Energetics and Riga Technical Universi

Irina Oleinikova
Institute of Physical Energetics

Gaidis Klavs
Institute of Physical Energetics

     Last modified: 2017-06-26

Electric vehicles are a promising option for reducing consumption of fossil fuels and greenhouse gas emissions. However, the integration of recharging points such as standard, fast and rapid charging, in distribution networks will inevitably increase energy demand and will vary depending on the behaviour of the user, which can cause serious problems for distribution networks.
This article is devoted to modelling the charging station of an electric vehicle and its interaction with a distribution network by using the algorithm that consists of four stages.

During the first phase, quantitative and qualitative indicators and analysis were performed on the basis of mathematical statistics and probability theory.

The second phase involved the model of optimizing and assessing the location of charging stations, which goal was to meet the necessary requirements for charging electric vehicles in the traditional parking spaces. To find the optimal connection points for charging stations, the branch and bound method was used.
To illustrate the process, the following input data were implemented:
• Amount and type of road transports <3.5 tone
• Parking patterns, hour
• Vehicle battery charging, kWh / 100 km: EV, PHEV, Electric motorcycle
• Charging station modes and strategy
• Economical benefits for owners: of charging stations and electric vehicles
• CO2, NOx, PM emissions (Copert 4 programme)

During the third, a decision was made in accordance with the criteria in the normal and post-fault modes.
During the fourth stage, the parameters were tested based on the already created calculation process in the second block of this algorithm, and MATLAB/Simulink (SimPowerSystems) was used to confirm the choice of places for connecting the charging stations.
The simulation model is used to assess the change in voltage and power of the distribution network during the charging period of electric vehicles. To analyse the results, two work modes were simulated: a model of the existing local network and a model of the same network with added charging stations.
This algorithm allowed obtaining a result for both – the existing and the projected distribution networks, and it is also assumed that new blocks will be introduced in future researching. For example, such as: generation from wind installations, new technologies for road transport (Fuel Cell Electric - FCEV, Vehicle to Grid - V2G and Vehicle to Home - V2H) and etc.


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