Charging Stations with Constant Power in Cooperation with a Photovoltaic Power Plant

Abstract

This paper deals with the analysis of battery charging for electric vehicles. The charging of electric vehicles is currently relevant from the point of view of the electricity supplier, the network operator, the electricity producer, while from the user’s point of view it is only about the consumption of electricity in the shortest possible time and in the required amount. For this reason, the consumer of electricity is a random element in the electricity system, which can cause various adverse conditions in the network, such as voltage asymmetry, sudden power loads (voltage drops), and in the case of inappropriate charging equipment, even higher harmonics. Since such a phenomenon of electric vehicle charging is more or less random (the user charges the batteries at different times and amounts), it is therefore appropriate to think about battery management so that the load behaves constantly at a set interval, so that it is possible to predict the setting of suitable energy sources and to conFigure the power line so as to ensure the least possible losses. For this purpose, a model of AC and DC battery charging with a constant value during the day was created in the Matlab / Simulink environment, while a different value of the charging current was considered for each day of a month. To supplement the power, a photovoltaic source was chosen as an auxiliary source, which reduced the consumption of electricity from the distribution network by approximately one fifth of the power. The results of the simulations were evaluated in conclusion.