NDLI: Hybrid single-carrier-based pulse width modulation scheme for single-phase three-level neutral-point-clamped grid-side converters in electric railway traction

Content Provider	IET Digital Library
Author	Wang, Shuliang Song, Wensheng Zhao, Junhui Feng, Xiaoyun
Abstract	AC traction power-supply systems are vulnerable to the high-order harmonics from grid-side rectifiers, which are usually single-phase three-level neutral-point-clamped (NPC) converters. In this study, a dipolar single-carrier-based pulse width modulation (SCBPWM) scheme is first designed for the adopted NPC converter. Then, on the basis of the dipolar SCBPWM scheme, a novel hybrid SCBPWM scheme with both unipolar and dipolar modulation modes is proposed to improve high-order harmonics and mitigate harmonic resonance. In addition, the voltage-balancing task of the DC-link capacitors of the NPC converter can be performed by fine adjustment of the separation coefficient in the hybrid SCBPWM. The salient features of the proposed scheme, as compared with the traditional unipolar double-carrier-based pulse width modulation, include: (1) lowered high-order harmonics and total harmonic distortion of the line current; (2) only one carrier signal needed; and (3) voltage fluctuation suppression of the neutral point. Performance of the proposed hybrid SCBPWM scheme for the NPC converter is verified by experimental results.
Starting Page	2500
Ending Page	2509
Page Count	10
ISSN	17554535
Volume Number	9
e-ISSN	17554543
Issue Number	Issue 13, Oct (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/9/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0656
Journal	IET Power Electronics
Publisher Date	2016-10-26
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Traction Power-supply System Carrier Signal DC-link Capacitor Dipolar Modulation Modes Dipolar SCBPWM Scheme Electric Railway Traction Grid-side Rectifier Harmonic Distortion Harmonic Resonance High-order Harmonics Hybrid SCBPWM Scheme Hybrid Single-carrier-based Pulse Width Modulation Scheme Line Current Neutral-point-clamped Grid-side Converter NPC Converter Power Conversion Harmonics Power Electronics Power Supply PWM Power Converter Railways Rectifier Separation Coefficient Single-phase Three-level Grid-side Converter Supervisory Circuit Total Harmonic Distortion Transportation Unipolar Double-carrier-based Pulse Width Modulation Unipolar Modulation Mode Voltage Fluctuation Suppression Voltage-balancing Task
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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