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Description
The ongoing project is focused on the advanced EV charging station, including the grid-connected AC/DC converter, non-isolated DC-DC converter cooperating with the battery energy storage, and finally, isolated DC-DC converters. The system has several possible operation modes, but does not contain any renewable energy source and is based on the energy from a three-phase grid. Thus, the extension of the system by a PV plant will increase the share of the renewable energy in the consumed electrical energy. At the same time, the existing energy storage may be applied to balance the energy produced
Summary of the results
The main aim of the Action was to work on an extension of the advanced EV charging system, developed in the source project-MoReSiC, by a PV plant. The system in the project is based on the energy delivered from the three-phase grid via a 20kVA three-level AC/DC converter, which can be provided to the vehicles by the isolated DC-DC converters or stored in the battery energy storage. The additional PV plant, which may be built in the neighborhood of the EV charging station, must be connected to the grid with a standard inverter or via a DC-DC converter to the connected to DC terminals of the system. This converter was a core of the action. The Ukrainian researcher was involved to the Action and was responsible for part of work. The issues investigated by the Ukrainian researcher wrer: study on connection of PV panels to thecharging system with bipolar DC-link and selection of the power converter topology; Selection of the power converter topologyas an interface for PV panels; Simulation study on the selected topology of the DC-DC converter. The MoReSiC team alone has built and tested the model of the DC-DC converter with the use of SiC power devices on the base of the project resources. The DC-DC converter was integrated into the EV charging system and the experiments validating the performance with a special focus on efficiency were performed. Also, additional operation modes were included in the main control algorithm.