Abstract
A practical energy management system (EMS) for electric vehicle (EV) charging stations powered by renewable energy sources is proposed in this paper. The solution is flexible enough to be adapted either to prosumers, which typically include small photovoltaic (PV) power plants for self-consumption, or to dedicated PV-based EV charging stations. By using standard communication and protocols, the proposed EMS implements an algorithm that can be easily configured to operate with commercially available equipment (e.g. PV and battery inverters, EV charging stations) and to follow a certain optimization target according to the EV owner choice. The proposed EV charging EMS was experimentally tested using a system developed in a campus building, including a rooftop PV power plant, a Li-ion battery storage system and a level 2 EV charging station. The experimental results, covering 11 months of operation, validate the proposed EMS in real operating conditions.
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