ABSTRACT:
Electric Vehicle (EV) batteries can be utilized as potential
energy storage devices in micro-grids. They can help inmicro-grid energy
management by storing energy when there is surplus (Grid-To-Vehicle, G2V) and
supplying energy back to the grid
(Vehicle-To-Grid, V2G) when there is demand for it. Proper infrastructure and
control systems have to be developed in order to realize this concept.
Architecture for implementing a V2G-G2V system in a micro-grid using level-3
fast charging of EVs is presented in this paper. A micro-grid test system is
modeled which has a dc fast charging station for interfacing the EVs.
Simulation studies are carried out to demonstrate V2G-G2V power transfer. Test
results show active power regulation in the micro-grid by EV batteries through
G2V-V2G modes of operation. The charging station design ensures minimal
harmonic distortion of grid injected current and the controller gives good
dynamic performance in terms of dc bus voltage stability.
KEYWORDS:
1.
DC fast charging
2.
Electric vehicle
3.
Grid connected inverter
4.
Micro-grid
5.
Off-board charger
6.
Vehicle-to-grid
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
Modeling
and design of a V2G system in a micro-grid using dc fast charging architecture
is presented in this paper. A dc fast charging station with off-board chargers
and a grid connected inverter is designed to interface EVs to the microgrid. The
control system designed for this power electronic interface allows bi-directional
power transfer between EVs and the grid. The simulation results show a smooth
power transfer between the EVs and the grid, and the quality of grid injected current
from the EVs adheres to the relevant standards. The designed controller gives
good dynamic performance in terms of dc bus voltage stability and in tracking
the changed active power reference. Active power regulation aspects of the
microgrid are considered in this work, and the proposed V2G system can be
utilized for several other services like reactive power control and frequency
regulation. Design of a supervisory controller which gives command signals to
the individual EV charger controllers is suggested for future research.
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