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Strategies Comparison for Voltage Unbalance Mitigation in LV Distribution Networks Using EV Chargers

Area of Electrical Engineering, E.T.S.I. Industriales, Universidad Politécnica de Madrid, 28006 Madrid, Spain
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Electronics 2019, 8(3), 289; https://doi.org/10.3390/electronics8030289
Received: 22 January 2019 / Revised: 16 February 2019 / Accepted: 28 February 2019 / Published: 5 March 2019
(This article belongs to the Special Issue Power Quality in Smart Grids)
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Abstract

The increasing penetration of Electric Vehicles (EVs) in LV distribution networks can potentially cause voltage quality issues such as voltage unbalance and under-voltage conditions. According to the EV charger characteristics, some strategies can be adopted to mitigate the aforementioned effects. Smart decentralized charging controls seem to be a more practical solution than centralized controls, since there is no need for communication because they rely only on local measurements. The four most relevant decentralized charging strategies, two for single-phase and two for three-phase EV chargers, have been implemented in a typical three-phase four-wire European LV distribution network. Simulations have been carried out for scenarios with single-phase EV chargers, three-phase EV chargers, and a combination of both. Single-phase controls are aimed at under-voltage regulation, while three-phase controls are focused on mitigating voltage unbalance. Results show that the implementation of a decentralized EV charging control is an adequate solution for Distribution System Operators (DSOs) since it improves the reliability and security of the network. Moreover, even though decentralized charging control does not use any communication, the combination of three-phase and single-phase controls is able to mitigate voltage unbalance while preventing the under-voltage condition. View Full-Text
Keywords: voltage unbalance; electric vehicles; LV distribution network; decentralized charging control voltage unbalance; electric vehicles; LV distribution network; decentralized charging control
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Nájera, J.; Mendonça, H.; de Castro, R.M.; Arribas, J.R. Strategies Comparison for Voltage Unbalance Mitigation in LV Distribution Networks Using EV Chargers. Electronics 2019, 8, 289.

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