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

Fuka Ikeda,Toshihiko Tanaka,Hiroaki Yamada,Masayuki Okamoto

doi:10.3390/en10060797

Abstract

This paper discusses harmonic current compensation of the constant DC-capacitor voltage-control (CDCVC)-based strategy of smart chargers for electric vehicles (EVs) in single-phase three-wire distribution feeders (SPTWDFs) under nonlinear load conditions. The basic principle of the CDCVC-based harmonics compensation strategy under nonlinear load conditions is discussed in detail. The instantaneous power flowing into the three-leg pulse-width modulated (PWM) rectifier, which performs as a smart charger, shows that the CDCVC-based strategy achieves balanced and sinusoidal source currents with a unity power factor. The CDCVC-based harmonics compensation strategy does not require any calculation blocks of fundamental reactive, unbalanced active, and harmonic currents. Thus, the authors propose a simplified algorithm to compensate for reactive, unbalanced active, and harmonic currents. A digital computer simulation is implemented to confirm the validity and high practicability of the CDCVC-based harmonics compensation strategy using PSIM software. Simulation results demonstrate that balanced and sinusoidal source currents with a unity power factor in SPTWDFs are obtained on the secondary side of the pole-mounted distribution transformer (PMDT) during both the battery-charging and discharging operations in EVs, compensating for the reactive, unbalanced active, and harmonic currents.

Highlights

Smart meters are installed for domestic consumers in areas serviced by the Tokyo ElectricPower Company and the Kansai Electric Power Company, but not for commercial consumers [1].These smart meters report the power consumption conditions of each domestic consumer to the electric power companies
The basic principle of the constant DC-capacitor voltage-control (CDCVC)-based strategy for smart chargers and the instantaneous power flowing into a smart charger are discussed in detail. This instantaneous power flowing into the smart charger shows that the previously proposed CDCVC-based strategy can compensate fundamental reactive, unbalanced active, and harmonic currents on the source side
Simulation results demonstrate that sinusoidal and balanced source currents with a unity power factor are achieved on the secondary side of the pole-mounted distribution transformer (PMDT) during both the battery-charging and -discharging operations in electric vehicles (EVs), compensating the reactive, unbalanced active, and harmonic currents

Summary

Introduction

Smart meters are installed for domestic consumers in areas serviced by the Tokyo ElectricPower Company and the Kansai Electric Power Company, but not for commercial consumers [1].These smart meters report the power consumption conditions of each domestic consumer to the electric power companies. Smart meters are installed for domestic consumers in areas serviced by the Tokyo Electric. Power Company and the Kansai Electric Power Company, but not for commercial consumers [1]. These smart meters report the power consumption conditions of each domestic consumer to the electric power companies. It is natural that household electricity prices associated with high quality power consumption should be lower than those for the consumers with low quality power consumptions. In the near future, each domestic consumer will take responsibility for improving the quality of their power consumption. In Japan, single-phase three-wire distribution feeders (SPTWDFs) with pole-mounted distribution transformers (PMDTs) are used for domestic consumers.

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Conclusion