Torque ripple RMS minimization in model predictive torque control of PMSM drives

This paper proposes an improved model predictive torque control (MPTC) with duty ratio optimization for three-phase AC permanent magnet synchronous motor (PMSM) drives. By predicting the evolution of variables concerned using system model, the best voltage vector satisfying the torque and flux command can be selected. As a result, MPC has a fast dynamic response and good steady-state response. Despite the merits above, the traditional MPC still presents some torque and flux ripples due to the use of single voltage vector during the whole control period. To further improve the steady state performance of conventional MPTC, this paper introduces the concept of duty cycle optimization in MPTC by dividing the control period into two intervals. The non-zero vector obtained from conventional MPTC is applied for a fraction of control period based on the principle of torque ripple minimization, while the rest of time is allocated for a null vector. Simulation results are presented to validate the effectiveness of this method.

[1]  A. Tani,et al.  FOC and DTC: two viable schemes for induction motors torque control , 2002 .

[2]  K. W. Lim,et al.  Analysis of direct torque control in permanent magnet synchronous motor drives , 1997 .

[3]  Sheng-Ming Yang,et al.  A deadbeat current controller for field oriented induction motor drives , 2002 .

[4]  S. Sul,et al.  New direct torque control of induction motor for minimum torque ripple and constant switching frequency , 1999 .

[5]  Jan Verveckken,et al.  Predictive Direct Torque Control for Flux and Torque Ripple Reduction , 2010, IEEE Transactions on Industrial Electronics.

[6]  Wei Xu,et al.  Predictive torque control of permanent magnet synchronous motor drive with reduced switching frequency , 2010, 2010 International Conference on Electrical Machines and Systems.

[7]  R.D. Lorenz,et al.  Stator and rotor flux based deadbeat direct torque control of induction machines , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[8]  Weiguo Liu,et al.  Research on Space Vector Modulation method for improving the torque ripple of Direct Torque Control , 2010, 2010 International Conference On Computer Design and Applications.

[9]  Yongchang Zhang,et al.  Direct Torque Control of Permanent Magnet Synchronous Motor With Reduced Torque Ripple and Commutation Frequency , 2011, IEEE Transactions on Power Electronics.

[10]  Manfred Morari,et al.  Model Predictive Direct Torque Control—Part I: Concept, Algorithm, and Analysis , 2009, IEEE Transactions on Industrial Electronics.

[11]  Yongchang Zhang,et al.  A Novel Duty Cycle Control Strategy to Reduce Both Torque and Flux Ripples for DTC of Permanent Magnet Synchronous Motor Drives With Switching Frequency Reduction , 2011, IEEE Transactions on Power Electronics.

[12]  Peter Mutschler,et al.  Direct mean torque control of an induction motor , 1997 .

[13]  P. Vas,et al.  Electrical machines and drives: present and future , 1996, Proceedings of 8th Mediterranean Electrotechnical Conference on Industrial Applications in Power Systems, Computer Science and Telecommunications (MELECON 96).

[14]  Ralph Kennel,et al.  High-Performance Control Strategies for Electrical Drives: An Experimental Assessment , 2012, IEEE Transactions on Industrial Electronics.

[15]  R. Kennel,et al.  An Improved FCS–MPC Algorithm for an Induction Motor With an Imposed Optimized Weighting Factor , 2012, IEEE Transactions on Power Electronics.

[16]  M. B. B. Sharifian,et al.  Field oriented control of permanent magnet synchronous motor using predictive space vector modulation , 2009, 2009 IEEE Symposium on Industrial Electronics & Applications.

[17]  José R. Rodríguez,et al.  Predictive Torque Control of Induction Machines Based on State-Space Models , 2009, IEEE Transactions on Industrial Electronics.

[18]  Marian P. Kazmierkowski,et al.  Direct torque control of PWM inverter-fed AC motors - a survey , 2004, IEEE Transactions on Industrial Electronics.

[19]  Antoni Arias,et al.  Novel direct torque control (DTC) scheme with fuzzy adaptive torque-ripple reduction , 2003, IEEE Trans. Ind. Electron..

[20]  José R. Espinoza,et al.  Predictive Torque and Flux Control Without Weighting Factors , 2013, IEEE Transactions on Industrial Electronics.

[21]  Ming-Ji Yang,et al.  Global Minimum Torque Ripple Design for Direct Torque Control of Induction Motor Drives , 2010, IEEE Transactions on Industrial Electronics.