Integrated Coordination of Electric Vehicle Operations and Renewable Energy Generation in a Microgrid

Junghoon Lee, Gyung-Leen Park

Abstract


This paper designs a microgrid energy controller capable of creating a charging or discharging schedule for electric vehicles (EVs), aiming at leveraging the integration of renewable energy and shaving the peak load in the microgrid. Dynamically activated on each time slot to cope with the prediction error for the power consumption and the renewable energy generation, the controller calculates the number of EVs to charge or make discharge first. Then, a greedy algorithm-based scheduler selects EVs according to the expected energy potential during their stays. The potential is the integral of a supply-demand margin function from the current time to the expected departure time. A simulator is implemented for performance evaluation, comparing with uncoordinated scheduling, according to the number of EVs as well as the behavior of energy load and production. The experiment result shows that the proposed scheme can reduce the energy waste by 16.9 %, cut down the microgrid-level energy insufficiency by 12.2 %, and enhance the amount of electricity supplied to EVs by 37.3 %, respectively, for given parameter setting.

Keywords


microgrid; electric vehicle; charging and discharging schedule; renewable energy integration; energy potential

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DOI: http://doi.org/10.11591/ijece.v7i2.pp706-712
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ISSN 2088-8708, e-ISSN 2722-2578