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Energy Management Scheme for an EV Smart Charger V2G/G2V Application with an EV Power Allocation Technique and Voltage Regulation

1
College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
2
KEPCO Economy and Management Research Institute, Naju 58217, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(4), 648; https://doi.org/10.3390/app8040648
Received: 20 March 2018 / Revised: 16 April 2018 / Accepted: 20 April 2018 / Published: 21 April 2018
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Abstract

The increasing penetration of electric vehicles (EVs) in the distribution grid has established them as a prospective resource for ancillary services. These services require adequate control strategies for prompt and efficient operation. In this study, an energy management scheme (EMS) has been proposed to employ an off-board EV smart charger to support the grid during short-term variance of renewables and reactive load onset. The scheme operates by calculating power references for the charger instantaneously. The EMS incorporates a proportional power division methodology, proposed to allocate power references to the individual EVs connected to the charger DC-bus. This methodology considers the state-of-charge and battery sizes of the EVs, and it can aggregate energy from various types of EVs. The proposed scheme is compared with another power allocation method, and the entire EMS is tested under the scenarios of power mismatch and voltage sag/swell events. The results show that the proposed scheme achieves the goal of the aggregation of EVs at the charger level to support the grid. The EMS also fulfills the objectives of voltage regulation and four-quadrant operation of the smart charger. View Full-Text
Keywords: EV aggregation; energy management strategies; four-quadrant converters; V2G; voltage sag and swell compensation EV aggregation; energy management strategies; four-quadrant converters; V2G; voltage sag and swell compensation
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Khan, S.U.; Mehmood, K.K.; Haider, Z.M.; Bukhari, S.B.A.; Lee, S.-J.; Rafique, M.K.; Kim, C.-H. Energy Management Scheme for an EV Smart Charger V2G/G2V Application with an EV Power Allocation Technique and Voltage Regulation. Appl. Sci. 2018, 8, 648.

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