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Energies 2018, 11(6), 1604; https://doi.org/10.3390/en11061604

Improvement in Harmonic Compensation of a Smart Charger with a Constant DC-Capacitor Voltage-Control-Based Strategy for Electric Vehicles in Single-Phase Three-Wire Distribution Feeders

1
Department of Electrical and Electronic Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan
2
Department of Electrical Engineering, National Institute of Technology, Ube College, 2-14-1 Tokiwadai, Ube, Yamaguchi 755-8555, Japan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 19 April 2018 / Revised: 10 June 2018 / Accepted: 14 June 2018 / Published: 19 June 2018
(This article belongs to the Special Issue Power Electronics for Energy Storage)
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Abstract

This paper presents an improvement in harmonic compensation performance of a previously proposed smart charger (SC) with a constant dc-capacitor voltage-control (CDCVC) strategy for electric vehicles (EVs) in single-phase three-wire distribution feeders (SPTWDFs). A controller for 3rd harmonic currents in d-q coordinates is added to the previously proposed SC. This addition improves harmonic compensation performance of the source currents. We briefly introduce harmonic current compensation using the previously proposed CDCVC-based algorithm for the SC. Then, the basic principles of the proposed controller for the 3rd harmonic currents in d-q coordinates are discussed in detail. It is shown that synchronization of the current controllers for both the fundamental and 3rd harmonic components is required. The switching frequency of a three-leg pulse-width modulated rectifier with a bidirectional dc–dc converter, which performs the SC, is determined considering the synchronization of the current controllers. Simulation and experimental results demonstrate that balanced and sinusoidal source currents with a unity power factor are achieved during both battery charging and discharging operations in EVs, improving the harmonic compensation performance of the previously proposed SC. Experimental results also demonstrate that the total harmonic distortion values of source currents are improved by 8.4% and 3.6% with the proposed controller for 3rd harmonic currents, when the SC is discharging, for example. View Full-Text
Keywords: smart charger; single-phase three-wire distribution feeders (SPTWDFs); harmonics compensation; constant DC-capacitor voltage control (CDCVC); three-leg PWM rectifier; bidirectional DC-DC converter; single-phase PLL circuit; single-phase d-q coordinate; 3rd harmonic currents smart charger; single-phase three-wire distribution feeders (SPTWDFs); harmonics compensation; constant DC-capacitor voltage control (CDCVC); three-leg PWM rectifier; bidirectional DC-DC converter; single-phase PLL circuit; single-phase d-q coordinate; 3rd harmonic currents
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nishikawa, K.; Ikeda, F.; Okamoto, Y.; Yamada, H.; Tanaka, T.; Okamoto, M. Improvement in Harmonic Compensation of a Smart Charger with a Constant DC-Capacitor Voltage-Control-Based Strategy for Electric Vehicles in Single-Phase Three-Wire Distribution Feeders. Energies 2018, 11, 1604.

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