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Open AccessArticle

Optimal Strategy to Exploit the Flexibility of an Electric Vehicle Charging Station

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Departamento de Electrónica, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
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Dipartimento Energia “Galileo Ferraris”, Politecnico di Torino, 10129 Torino, Italy
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Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, 10129 Torino, Italy
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Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3834; https://doi.org/10.3390/en12203834
Received: 11 September 2019 / Revised: 26 September 2019 / Accepted: 3 October 2019 / Published: 10 October 2019
(This article belongs to the Special Issue Impact of Electric Vehicles on the Power System)
The increasing use of electric vehicles connected to the power grid gives rise to challenges in the vehicle charging coordination, cost management, and provision of potential services to the grid. Scheduling of the power in an electric vehicle charging station is a quite challenging task, considering time-variant prices, customers with different charging time preferences, and the impact on the grid operations. The latter aspect can be addressed by exploiting the vehicle charging flexibility. In this article, a specific definition of flexibility to be used for an electric vehicle charging station is provided. Two optimal charging strategies are then proposed and evaluated, with the purpose of determining which strategy can offer spinning reserve services to the electrical grid, reducing at the same time the operation costs of the charging station. These strategies are based on a novel formulation of an economic model predictive control algorithm, aimed at minimising the charging station operation cost, and on a novel formulation of the flexibility capacity maximisation, while reducing the operation costs. These formulations incorporate the uncertainty in the arrival time and state of charge of the electric vehicles at their arrival. Both strategies lead to a considerable reduction of the costs with respect to a simple minimum time charging strategy, taken as the benchmark. In particular, the strategy that also accounts for flexibility maximisation emerges as a new tool for maintaining the grid balance giving cost savings to the charging stations. View Full-Text
Keywords: electric vehicle; flexible demand; model predictive control; spinning reserve electric vehicle; flexible demand; model predictive control; spinning reserve
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Diaz-Londono, C.; Colangelo, L.; Ruiz, F.; Patino, D.; Novara, C.; Chicco, G. Optimal Strategy to Exploit the Flexibility of an Electric Vehicle Charging Station. Energies 2019, 12, 3834.

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