An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines

Direct Torque Control (DTC) of induction machine has received wide acceptance in many adjustable speed drive applications due to its simplicity and high performance torque control. However, the DTC using a common two-level inverter poses two major problems such as higher switching frequency (or powe...

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Main Author:	Zuber Ahmadi, Muhd Zharif Rifqi
Format:	Thesis
Language:	English English
Published:	2016
Subjects:	T Technology (General)
Online Access:	http://eprints.utem.edu.my/id/eprint/18384/1/An%20Optimal%20Switching%20Strategy%20Of%20Cascaded%20H-Bridge%20Multilevel%20Inverter%20For%20High-Performance%20Direct%20Torque%20Control%20Of%20Induction%20Machines.pdf http://eprints.utem.edu.my/id/eprint/18384/2/An%20Optimal%20Switching%20Strategy%20Of%20Cascaded%20H-Bridge%20Multilevel%20Inverter%20For%20High-Performance%20Direct%20Torque%20Control%20Of%20Induction%20Machines.pdf
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institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
topic	T Technology (General) T Technology (General)
spellingShingle	T Technology (General) T Technology (General) Zuber Ahmadi, Muhd Zharif Rifqi An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines
description	Direct Torque Control (DTC) of induction machine has received wide acceptance in many adjustable speed drive applications due to its simplicity and high performance torque control. However, the DTC using a common two-level inverter poses two major problems such as higher switching frequency (or power loss) and larger torque ripple. These problems are due to inappropriate voltage vectors which are selected among a limited number of voltage vectors available in two-level inverter. The proposed research aims to formulate an optimal switching strategy using three-level Cascaded H-Bridge Multilevel Inverter (CHMI) for high performances of Direct Torque Control (DTC) of induction machines. By using three-level CHMI, it provides greater number of voltage vectors which can offer more options to select the most appropriate voltage vectors. The most appropriate voltage vectors are identified as the vectors that can produce minimum torque slope but sufficient to satisfy torque demands. The identification is accomplished by using an equation of rate of change of torque which is derived from the induction machine equations. The proposed strategy also introduces a block of modification of torque error status which is responsible to modify the status such that it can determine the most optimal voltage vectors from a look-up table, according to motor operating conditions. Some improvements obtained in the proposed strategy were verified via simulations and experimentations, as well as comparison with the conventional DTC using a two-level inverter. The improvements obtained are as follows; 1) minimization of switching frequency which is expected to reduce power loss, and 2) reduction of torque ripple. These two improvements are important requirements
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Zuber Ahmadi, Muhd Zharif Rifqi
author_facet	Zuber Ahmadi, Muhd Zharif Rifqi
author_sort	Zuber Ahmadi, Muhd Zharif Rifqi
title	An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines
title_short	An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines
title_full	An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines
title_fullStr	An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines
title_full_unstemmed	An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines
title_sort	optimal switching strategy of cascaded h-bridge multilevel inverter for high-performance direct torque control of induction machines
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty of Electrical Engineering
publishDate	2016
url	http://eprints.utem.edu.my/id/eprint/18384/1/An%20Optimal%20Switching%20Strategy%20Of%20Cascaded%20H-Bridge%20Multilevel%20Inverter%20For%20High-Performance%20Direct%20Torque%20Control%20Of%20Induction%20Machines.pdf http://eprints.utem.edu.my/id/eprint/18384/2/An%20Optimal%20Switching%20Strategy%20Of%20Cascaded%20H-Bridge%20Multilevel%20Inverter%20For%20High-Performance%20Direct%20Torque%20Control%20Of%20Induction%20Machines.pdf
_version_	1747833928201273344
spelling	my-utem-ep.183842021-10-10T16:21:45Z An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines 2016 Zuber Ahmadi, Muhd Zharif Rifqi T Technology (General) TK Electrical engineering. Electronics Nuclear engineering Direct Torque Control (DTC) of induction machine has received wide acceptance in many adjustable speed drive applications due to its simplicity and high performance torque control. However, the DTC using a common two-level inverter poses two major problems such as higher switching frequency (or power loss) and larger torque ripple. These problems are due to inappropriate voltage vectors which are selected among a limited number of voltage vectors available in two-level inverter. The proposed research aims to formulate an optimal switching strategy using three-level Cascaded H-Bridge Multilevel Inverter (CHMI) for high performances of Direct Torque Control (DTC) of induction machines. By using three-level CHMI, it provides greater number of voltage vectors which can offer more options to select the most appropriate voltage vectors. The most appropriate voltage vectors are identified as the vectors that can produce minimum torque slope but sufficient to satisfy torque demands. The identification is accomplished by using an equation of rate of change of torque which is derived from the induction machine equations. The proposed strategy also introduces a block of modification of torque error status which is responsible to modify the status such that it can determine the most optimal voltage vectors from a look-up table, according to motor operating conditions. Some improvements obtained in the proposed strategy were verified via simulations and experimentations, as well as comparison with the conventional DTC using a two-level inverter. The improvements obtained are as follows; 1) minimization of switching frequency which is expected to reduce power loss, and 2) reduction of torque ripple. These two improvements are important requirements 2016 Thesis http://eprints.utem.edu.my/id/eprint/18384/ http://eprints.utem.edu.my/id/eprint/18384/1/An%20Optimal%20Switching%20Strategy%20Of%20Cascaded%20H-Bridge%20Multilevel%20Inverter%20For%20High-Performance%20Direct%20Torque%20Control%20Of%20Induction%20Machines.pdf text en public http://eprints.utem.edu.my/id/eprint/18384/2/An%20Optimal%20Switching%20Strategy%20Of%20Cascaded%20H-Bridge%20Multilevel%20Inverter%20For%20High-Performance%20Direct%20Torque%20Control%20Of%20Induction%20Machines.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=100235 mphil masters Universiti Teknikal Malaysia Melaka Faculty of Electrical Engineering 1. Alias, N. F., Jidin, A., Ismail, H., Firdaus, R. N., Rahim, M. K., Razi, A. & Abd Halim, W. 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An Optimal Switching Strategy Of Cascaded H-Bridge Multilevel Inverter For High-Performance Direct Torque Control Of Induction Machines

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