Inclusion of Battery Storage in EV Charger for Lowering the Impact on the Grid
The primary goal of P2P project is to develop a multiport, flexible and intelligent Electric Vehicle (EV) DC-type charger which features multiple output charging spots through the implementation of multiplexing techniques, along with the incorporation of energy storage elements. The proposed DCFC is expect to handle the rapidly increasing EV charging demand with multiple features.
Additionally, the incorporation of intermittent renewable energy sources into the grid, specially based on wind and solar, is dramatically increasing. Additionally, the great usage of Electric Vehicles (EV) which constitutes an unpredictable high power peak load. This can lead to grid stability issues and lower availability of energy for other loads. Therefore, the inclusion of energy storage elements into the EV charger is proposed in this project to solve these potential problems.
Moreover, to counter act to the expected reduction of governmental subsidies and consequent increment of the charging cost, the system can incorporate energy storage into the inner DC grid. This is advantageous to buffer the power demand from the AC grid and to reduce energy consumption costs. The usage of such technologies can help to lessen undesirable effects on the AC grid caused by recurrent high power demand from the fast EV charging process. Additionally, with enough storage capacity the proposed EV infrastructure can participate in the ancillary services markets, providing services to the public AC grid such as frequency balancing, voltage control and congestion management. The sizing of energy storage and the type of ancillary services provision versus the required investments on improving AC grid infrastructure constitutes an economic optimization problem which is dependent of several factors within the energy market, i.e. energy tariffs, monetary compensation in the ancillary service market, governmental subsidies, among others.
The challenges of this project lies in :
- Selection of suited AC/DC converter for proposed modularized DCFC with features such as multi-ports and multiplexing.
- Selection of suited AC interfaced filters to satisfy the high power density demand while maintaining better performances (harmonics, control stability)
- Optimized sizing the integration of energy storage with considerations such as power level of charger, grid power quality and stability and economic aspects (from point of view of DC grid).
The laboratory scale demonstrator of 10 kW charger with the integration of energy storage will be developed and tested.