Remedial Strategies of T-NPC Three-Level Asymmetric Six-Phase PMSM Drives Based on SVM-DTC

In this paper, novel remedial direct torque control (DTC) schemes are proposed for open-circuit faults in T-type neutral-point-clamping (T-NPC) three-level asymmetric six-phase permanent-magnet synchronous motor (PMSM) drives. First, a simplified space vector modulation (SVM) is designed and applied...

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Published in	IEEE transactions on industrial electronics (1982) Vol. 64; no. 9; pp. 6841 - 6853
Main Authors	Wang, Xueqing, Wang, Zheng, Cheng, Ming, Hu, Yihua
Format	Journal Article
Language	English
Published	New York IEEE 01.09.2017 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects	Asymmetric six-phase permanent-magnet synchronous motor (PMSM) drives Asymmetry Coils (windings) Dynamic response Fault tolerance Fault tolerant control Fault tolerant systems Faults Fluxes Harmonic analysis Inverters Permanent magnets Perturbation Space vector modulation space vector modulation direct torque control (SVM-DTC) Stators Support vector machines Switches Synchronous motors T-type neutral-point-clamping (T-NPC) inverter Voltage control
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Abstract	In this paper, novel remedial direct torque control (DTC) schemes are proposed for open-circuit faults in T-type neutral-point-clamping (T-NPC) three-level asymmetric six-phase permanent-magnet synchronous motor (PMSM) drives. First, a simplified space vector modulation (SVM) is designed and applied for DTC-controlled asymmetric six-phase drive, in such a way that both good current harmonic performance and fast dynamic response are available. Based on the SVM-DTC scheme, a remedial strategy is proposed for the open-circuit faults in phase windings. The key is to derive the relationship between the stator fluxes and the stator voltages of all phases under faulty condition. Then, a derived perturbation term is compensated for normal voltage references, and the fault-tolerant scheme is, thus, implemented without changing control structure of normal condition. The remedial DTC schemes are also studied and proposed for open-switch faults in T-NPC six-phase drives. The modulation methods are redesigned for the faults in half-bridge switches and NPC switches. The experiments are carried out on a laboratory prototype to verify the validity and performance of the proposed fault-tolerant control schemes.
AbstractList	In this paper, novel remedial direct torque control (DTC) schemes are proposed for open-circuit faults in T-type neutral-point-clamping (T-NPC) three-level asymmetric six-phase permanent-magnet synchronous motor (PMSM) drives. First, a simplified space vector modulation (SVM) is designed and applied for DTC-controlled asymmetric six-phase drive, in such a way that both good current harmonic performance and fast dynamic response are available. Based on the SVM-DTC scheme, a remedial strategy is proposed for the open-circuit faults in phase windings. The key is to derive the relationship between the stator fluxes and the stator voltages of all phases under faulty condition. Then, a derived perturbation term is compensated for normal voltage references, and the fault-tolerant scheme is, thus, implemented without changing control structure of normal condition. The remedial DTC schemes are also studied and proposed for open-switch faults in T-NPC six-phase drives. The modulation methods are redesigned for the faults in half-bridge switches and NPC switches. The experiments are carried out on a laboratory prototype to verify the validity and performance of the proposed fault-tolerant control schemes.
Author	Zheng Wang Ming Cheng Yihua Hu Xueqing Wang
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SubjectTerms	Asymmetric six-phase permanent-magnet synchronous motor (PMSM) drives Asymmetry Coils (windings) Dynamic response Fault tolerance Fault tolerant control Fault tolerant systems Faults Fluxes Harmonic analysis Inverters Permanent magnets Perturbation Space vector modulation space vector modulation direct torque control (SVM-DTC) Stators Support vector machines Switches Synchronous motors T-type neutral-point-clamping (T-NPC) inverter Voltage control
Title	Remedial Strategies of T-NPC Three-Level Asymmetric Six-Phase PMSM Drives Based on SVM-DTC
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