Realization of a power distributing electric vehicle charging system

Inhalt:
An increasing number of renewable energy sources (RES) and electric vehicles (EVs) can cause significant additional strain on the electrical grid. If the charging process of EVs is controlled and adapted to the local generation of RES, the strain on the electrical grid can be mitigated. To investigate these possibilities, a multi electric vehicle supply equip-ment (EVSE), that uses a maximum amount of power generation of photovoltaic (PV) systems is presented in this paper. To maximize the local solar energy, a photovoltaic forecast in combination with intelligent charge scheduling is used. To improve the charge schedule, additional information is requested in advance from the user. A standard programmable logic controller (PLC) has been adapted by additional hardware to enable it for vehicle charging. Due to long dwell times of EVs, for example at work, single-phase charging is used to evade unpredictable unbalanced phase currents. The hard-ware setup has shown fully functional behavior in a laboratory environment and is ready to be tested in real-world sce-narios.