ERA

Download the full-sized PDF of Multilevel Space Vector PWM for Multilevel Coupled Inductor InvertersDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R30S96

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Graduate Studies and Research, Faculty of

Collections

This file is in the following collections:

Theses and Dissertations

Multilevel Space Vector PWM for Multilevel Coupled Inductor Inverters Open Access

Descriptions

Other title
Subject/Keyword
interleaved discontinuous PWM
Multilevel inverter
coupled inductor inverter (CII)
discontinuous space vector pulse width modulation (DSVPWM)
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Vafakhah, Behzad
Supervisor and department
Salmon, John (Electrical Engineering)
Knight, Andy (Electrical Engineering)
Examining committee member and department
Kumar, Amit (Mechanical Engineering)
Gaudet, Vincent (Electrical Engineering)
Li, Yunwei (Electrical Engineering)
Kazerani, Mehrdad (Electrical Engineering, University of Waterloo)
Department
Department of Electrical and Computer Engineering
Specialization

Date accepted
2010-02-24T21:51:04Z
Graduation date
2010-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
A multilevel Space Vector PWM (SVPWM) technique is developed for a 3-level 3-phase PWM Voltage Source Inverter using a 3-phase coupled inductor to ensure high performance operation. The selection of a suitable PWM switching scheme for the Coupled Inductor Inverter (CII) topology should be based on the dual requirements for a high-quality multilevel PWM output voltage together with the need to minimize high frequency currents and associated losses in the coupled inductor and the inverter switches. Compared to carrier-based multilevel PWM schemes, the space vector techniques provide a wider variety of choices of the available switching states and sequences. The precise identification of pulse placements in the SVPWM method is used to improve the CII performance. The successful operation of the CII topology over the full modulation range relies on selecting switching states where the coupled inductor presents a low winding current ripple and a high effective inductance between the upper and lower switches in each inverter leg. In addition to these requirements, the CII operation is affected by the imbalance inductor common mode dc current. When used efficiently, SVPWM allows for an appropriate balance between the need to properly manage the inductor winding currents and to achieve harmonic performance gains. A number of SVPWM strategies are developed, and suitable switching states are selected for these methods. Employing the interleaved PWM technique by using overlapping switching states, the interleaved Discontinuous SVPWM (DSVPWM) method, compared to other proposed SVPWM methods, doubles the effective switching frequency of the inverter outputs and, as a result, offers superior performance for the CII topology by reducing the inductor losses and switching losses. The inverter operation is examined by means of simulation and experimental testing. The experimental performance comparison is obtained for different PWM switching patterns. The inverter performance is affected by high-frequency inductor current ripple; the excessive inductor losses are reduced by the DSVPWM method. Additional experimental test results are carried out to obtain the inverter performance as a variable frequency drive when operated in steady-state and during transient conditions. The CII topology is shown to have great potential for variable speed drives.
Language
English
DOI
doi:10.7939/R30S96
Rights
License granted by Behzad Vafakhah (vafakhah@ualberta.ca) on 2010-02-22T10:07:36Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication

File Details

Date Uploaded
Date Modified
2014-04-29T16:00:44.007+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 3985545
Last modified: 2015:10:12 13:39:56-06:00
Filename: Vafakhah_Behzad_Spring 2010.pdf
Original checksum: c3a0c1eecc6d24a82416273225e23546
Well formed: true
Valid: true
File title: <May be encrypted>
File title: Microsoft Word - Thesis_Final_Submission_Ver5_Photo.doc
File author: <May be encrypted>
File author: Behzad
Page count: 166
Activity of users you follow
User Activity Date