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DSP Based Realization of Pre-Processed Discontinuous PWM Schemes for 3-Limb Core Coupled Inductor Inverters Open Access


Other title
Discontinuous PWM
3-Limb Core
Coupled Inductor Inverter
Type of item
Degree grantor
University of Alberta
Author or creator
Perera, Srilak N
Supervisor and department
Salmon, John (Electrical and Computer Engineering)
Examining committee member and department
Khajehoddin, Ali (Electrical and Computer Engineering)
Vaidyanathan, Mani (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Energy Systems
Date accepted
Graduation date
Master of Science
Degree level
The design of most power electronic systems is ultimately linked to the devices being used, the system efficiency and the system cost. A Digital Signal Processor (DSP) based 3-phase Pulse Width Modulation (PWM) switching scheme for a 3-Limb Core Coupled Inductor Inverter (CII) is presented as a low cost controller solution to provide better excitation for the magnetic core. This is consistent with lowering the cost of the power converter system with the use of a 3-limb core, as opposed to three separate inductors, and reduced switch count for the inverter. A modified interleaved discontinuous PWM scheme is examined that restrains the main inductor magnetic flux to lie within the magnetic core. This basic guideline for a suitable PWM scheme is to guarantee that all the inverter switching states maintain a zero inductor net winding voltage for the three phases. The scheme also smoothens the high frequency winding current ripple. In a practical sense, such a scheme normally requires extensive control and PWM tasks which calls for a high-end processor with parallel and post-processing capacities, hence increasing system costs. A low cost solution, by manipulating the original conceptual scheme, is introduced as an alternative Pre-Processed PWM scheme for a DSP environment, using only one carrier signal. Experimental results verify that the DSP PWM module can successfully implement the target scheme in a less complex manner. The DSP realization of the PWM scheme not only provides cost effectiveness by eliminating the need for a high-end processor, but also minimizes the size of the control circuitry. Experimental results confirm that the DSP based scheme offers the same system high power conversion efficiency as the original conceptual PWM scheme, due to benefits related to the reduction of the high frequency winding current ripple
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. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before 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.
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File title: DSP Based Realization of Pre-Processed Discontinuous PWM Schemes for 3-Limb Core Coupled Inductor Inverters
File author: Srilak Nirmana Perera
Page count: 176
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