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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| Format: | Article |
| Language: | English |
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IEEE
2021-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9617615/ |
| _version_ | 1818434949972230144 |
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| author | Mohammad Hosein Holakooie Grzegorz Iwanski |
| author_facet | Mohammad Hosein Holakooie Grzegorz Iwanski |
| author_sort | Mohammad Hosein Holakooie |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-14T16:45:07Z |
| format | Article |
| id | doaj.art-b4e963e02c774037a18b7f79fdd11659 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T16:45:07Z |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-b4e963e02c774037a18b7f79fdd116592022-12-21T22:54:12ZengIEEEIEEE Access2169-35362021-01-01915469215470310.1109/ACCESS.2021.31287599617615Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction MotorsMohammad Hosein Holakooie0https://orcid.org/0000-0003-4217-0940Grzegorz Iwanski1https://orcid.org/0000-0002-0561-7996Institute of Control and Industrial Electronics, Warsaw University of Technology, Warszawa, PolandInstitute of Control and Industrial Electronics, Warsaw University of Technology, Warszawa, PolandClassical 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.https://ieeexplore.ieee.org/document/9617615/Direct torque control (DTC)six-phase induction machine (6PIM)switching tabletorque ripplevirtual voltage vectors (VVs)virtual subspace |
| spellingShingle | Mohammad Hosein Holakooie Grzegorz Iwanski Virtual Subspace-Based DTC Strategy for Torque Ripple Minimization in Six-Phase Induction Motors IEEE Access Direct torque control (DTC) six-phase induction machine (6PIM) switching table torque ripple virtual voltage vectors (VVs) virtual subspace |
| title | 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_short | 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 |
| topic | Direct torque control (DTC) six-phase induction machine (6PIM) switching table torque ripple virtual voltage vectors (VVs) virtual subspace |
| url | https://ieeexplore.ieee.org/document/9617615/ |
| work_keys_str_mv | AT mohammadhoseinholakooie virtualsubspacebaseddtcstrategyfortorquerippleminimizationinsixphaseinductionmotors AT grzegorziwanski virtualsubspacebaseddtcstrategyfortorquerippleminimizationinsixphaseinductionmotors |