A modified hysteresis-based DTC strategy for synchronous reluctance motors in high speed range

This paper presents a modified hysteresis-based direct torque control (DTC) for synchronous reluctance machines. The proposed method is utilized to achieve high torque capability in flux weakening region. It will be shown that hysteresis-based DTC is established by two hysteresis comparators. A higher torque capability is fulfilled by switching only the optimized voltage vector during torque dynamic condition, instead of alternating between two vectors. The selection of optimized voltage vector can be implemented by modifying the flux error status generated by the stator flux comparator before it is fed to the switching table. The main benefit of the proposed method is its simplicity because it requires only a minor modification to conventional hysteresis-based DTC and does not require a space vector block. The effectiveness is verified by simulation.

[1]  J. Soltani,et al.  Variable structure direct torque control of encoderless synchronous reluctance motor drives with maximized efficiency , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[2]  Jawad Faiz,et al.  A novel technique for estimation and control of stator flux of a salient-pole PMSM in DTC method based on MTPF , 2003, IEEE Trans. Ind. Electron..

[3]  Seung-Ki Sul,et al.  A new overmodulation strategy for induction motor drive using space vector PWM , 1995, Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95.

[4]  L.M. Tolbert,et al.  Direct torque control of induction machines using space vector modulation , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[5]  Xiaohua Li,et al.  Analytical Modeling of Traffic Flow in the Substation Communication Network , 2015, IEEE Transactions on Power Delivery.

[6]  David G. Dorrell,et al.  Automotive Electric Propulsion Systems With Reduced or No Permanent Magnets: An Overview , 2014, IEEE Transactions on Industrial Electronics.

[7]  Marco Ferrari,et al.  Design of Synchronous Reluctance Motor for Hybrid Electric Vehicles , 2015, IEEE Transactions on Industry Applications.

[8]  Pragasen Pillay,et al.  A Sizing Methodology of the Synchronous Reluctance Motor for Traction Applications , 2014, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[9]  Timothy J. E. Miller,et al.  Maximising the saliency ratio of the synchronous reluctance motor , 1993 .

[10]  Yuan Ren,et al.  Enhancement of Steady-State Performance in Direct-Torque-Controlled Dual Three-Phase Permanent-Magnet Synchronous Machine Drives With Modified Switching Table , 2015, IEEE Transactions on Industrial Electronics.

[11]  Seung-Ki Sul,et al.  Efficiency-optimized direct torque control of synchronous reluctance motor using feedback linearization , 1999, IEEE Trans. Ind. Electron..

[12]  I. Takahashi,et al.  High-performance direct torque control of an induction motor , 1989 .

[13]  R.E. Betz,et al.  Control of synchronous reluctance machines , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[14]  Ashwin M. Khambadkone,et al.  Dynamic control of torque in overmodulation and in the field weakening region , 2006, IEEE Transactions on Power Electronics.

[15]  S Bolognani,et al.  Online MTPA Control Strategy for DTC Synchronous-Reluctance-Motor Drives , 2011, IEEE Transactions on Power Electronics.

[16]  Yuan Ren,et al.  Direct Torque Control of Permanent-Magnet Synchronous Machine Drives With a Simple Duty Ratio Regulator , 2014, IEEE Transactions on Industrial Electronics.

[17]  Alfredo Vagati,et al.  The synchronous reluctance solution: a new alternative in AC drives , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[18]  Joachim Holtz,et al.  On continuous control of PWM inverters in the overmodulation range including the six-step mode , 1992, Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation, and Automation.

[19]  Yongchang Zhang,et al.  Model Predictive Torque Control of Induction Motor Drives With Optimal Duty Cycle Control , 2014, IEEE Transactions on Power Electronics.