Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors

Classical switching-table-based direct torque control (ST-DTC) of six-phase induction machine (6PIM) drives is seriously penalized by current harmonics as well as torque ripples because of uncontrolled voltage vectors in the low-impedance non-energy subspace and hysteresis torque regulator, respecti...

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Autores principales:	Mohammad Hosein Holakooie, Grzegorz Iwanski
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Direct torque control (DTC) six-phase induction machine (6PIM) switching table torque ripple virtual voltage vectors (VVs) virtual subspace Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/b4e963e02c774037a18b7f79fdd11659
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id	oai:doaj.org-article:b4e963e02c774037a18b7f79fdd11659
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spelling	oai:doaj.org-article:b4e963e02c774037a18b7f79fdd116592021-11-25T00:01:08ZVirtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors2169-353610.1109/ACCESS.2021.3128759https://doaj.org/article/b4e963e02c774037a18b7f79fdd116592021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9617615/https://doaj.org/toc/2169-3536Classical switching-table-based direct torque control (ST-DTC) of six-phase induction machine (6PIM) drives is seriously penalized by current harmonics as well as torque ripples because of uncontrolled voltage vectors in the low-impedance non-energy subspace and hysteresis torque regulator, respectively. Hence, a virtual subspace-based DTC strategy is proposed to alleviate the impact of low-order current harmonics and torque ripples. The proposed virtual subspace includes 48 virtual voltage vectors (VVs) in the <inline-formula> <tex-math notation="LaTeX">$\alpha -\beta $ </tex-math></inline-formula> subspace with average volt-seconds of zero in the <inline-formula> <tex-math notation="LaTeX">$z_{1}-z_{2}$ </tex-math></inline-formula> subspace, which offers full extent of freedom degrees for 6PIM fed by a two-level voltage source inverter (VSI). The increased number of VVs allows the possibility to design up to nine-level hysteresis torque regulator to minimize the torque ripples. Nevertheless, in this paper, it is found that torque ripple, current harmonics, average switching frequency, and computational burden come to a compromise with a seven-level hysteresis torque regulator. The impact of these VVs on the performance of ST-DTC is experimentally studied and some details of hardware implementation are presented. The performance of the proposed scheme is verified by simulations as well as laboratory experiments, where a complete comparison with recent schemes is made to reveal the superiority of the proposed scheme.Mohammad Hosein HolakooieGrzegorz IwanskiIEEEarticleDirect torque control (DTC)six-phase induction machine (6PIM)switching tabletorque ripplevirtual voltage vectors (VVs)virtual subspaceElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 154692-154703 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Direct torque control (DTC) six-phase induction machine (6PIM) switching table torque ripple virtual voltage vectors (VVs) virtual subspace Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Direct torque control (DTC) six-phase induction machine (6PIM) switching table torque ripple virtual voltage vectors (VVs) virtual subspace Electrical engineering. Electronics. Nuclear engineering TK1-9971 Mohammad Hosein Holakooie Grzegorz Iwanski Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors
description	Classical switching-table-based direct torque control (ST-DTC) of six-phase induction machine (6PIM) drives is seriously penalized by current harmonics as well as torque ripples because of uncontrolled voltage vectors in the low-impedance non-energy subspace and hysteresis torque regulator, respectively. Hence, a virtual subspace-based DTC strategy is proposed to alleviate the impact of low-order current harmonics and torque ripples. The proposed virtual subspace includes 48 virtual voltage vectors (VVs) in the <inline-formula> <tex-math notation="LaTeX">$\alpha -\beta $ </tex-math></inline-formula> subspace with average volt-seconds of zero in the <inline-formula> <tex-math notation="LaTeX">$z_{1}-z_{2}$ </tex-math></inline-formula> subspace, which offers full extent of freedom degrees for 6PIM fed by a two-level voltage source inverter (VSI). The increased number of VVs allows the possibility to design up to nine-level hysteresis torque regulator to minimize the torque ripples. Nevertheless, in this paper, it is found that torque ripple, current harmonics, average switching frequency, and computational burden come to a compromise with a seven-level hysteresis torque regulator. The impact of these VVs on the performance of ST-DTC is experimentally studied and some details of hardware implementation are presented. The performance of the proposed scheme is verified by simulations as well as laboratory experiments, where a complete comparison with recent schemes is made to reveal the superiority of the proposed scheme.
format	article
author	Mohammad Hosein Holakooie Grzegorz Iwanski
author_facet	Mohammad Hosein Holakooie Grzegorz Iwanski
author_sort	Mohammad Hosein Holakooie
title	Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors
title_short	Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors
title_full	Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors
title_fullStr	Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors
title_full_unstemmed	Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors
title_sort	virtual subspace-based dtc strategy for torque ripple minimization in six-phase induction motors
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/b4e963e02c774037a18b7f79fdd11659
work_keys_str_mv	AT mohammadhoseinholakooie virtualsubspacebaseddtcstrategyfortorquerippleminimizationinsixphaseinductionmotors AT grzegorziwanski virtualsubspacebaseddtcstrategyfortorquerippleminimizationinsixphaseinductionmotors
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Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors

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