Model Predictive Torque Control of Induction Motor Drives With Optimal Duty Cycle Control

Model predictive torque control (MPTC) is emerging as a powerful control scheme for high performance control of induction motor (IM) drives. Compared to direct torque control, MPTC is more effective and accurate in voltage vector selection by incorporating the system model directly with the finite switching states. However, for two-level inverter-fed IM drives, the sampling frequency of MPTC has to be high to achieve good performance due to the limited number of voltage vectors. Recently, the concept of duty cycle control was introduced in MPTC by inserting a null vector along with the selected active voltage vector to achieve torque ripple reduction. The active vector is first selected from conventional MPTC and then its duration is determined based on a certain principle. The cascaded processing of active vector and its duration leads to poor low-speed performance and the sampling frequency still has to be high. This paper proposes an improved MPTC with duty cycle control by optimizing the vector selection and its duration simultaneously when minimizing both torque and flux errors. As a result, better steady-state performance at both low and high speeds is achieved, even if the sampling frequency is reduced by half. The effectiveness of the proposed MPTC is verified by both simulation and experimental results.

[1]  Cesar Silva,et al.  Delay Compensation in Model Predictive Current Control of a Three-Phase Inverter , 2012, IEEE Transactions on Industrial Electronics.

[2]  Patrick Wheeler,et al.  Predictive Torque Control of an Induction Machine Fed by a Matrix Converter With Reactive Input Power Control , 2010, IEEE Transactions on Power Electronics.

[3]  Ralph Kennel,et al.  Predictive control in power electronics and drives , 2008, 2008 IEEE International Symposium on Industrial Electronics.

[4]  Mitja Nemec,et al.  Predictive Torque Control of Induction Machines using Immediate Flux Control , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[5]  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.

[6]  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.

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

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

[9]  Tobias Geyer,et al.  Computationally efficient Model Predictive Direct Torque Control , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[10]  Yongchang Zhang,et al.  A Simple Method to Reduce Torque Ripple in Direct Torque-Controlled Permanent-Magnet Synchronous Motor by Using Vectors With Variable Amplitude and Angle , 2011, IEEE Transactions on Industrial Electronics.

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

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

[13]  Wei Xu,et al.  An Improved Direct Torque Control for Three-Level Inverter-Fed Induction Motor Sensorless Drive , 2012, IEEE Transactions on Power Electronics.

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

[15]  Yongchang Zhang,et al.  Three-Vectors-Based Predictive Direct Power Control of the Doubly Fed Induction Generator for Wind Energy Applications , 2014, IEEE Transactions on Power Electronics.

[16]  S. A. Davari,et al.  Using Full Order and Reduced Order Observers for Robust Sensorless Predictive Torque Control of Induction Motors , 2012, IEEE Transactions on Power Electronics.

[17]  H. Kubota,et al.  DSP-based speed adaptive flux observer of induction motor , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

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

[19]  Yongchang Zhang,et al.  Low Complexity Model Predictive Control—Single Vector-Based Approach , 2014, IEEE Transactions on Power Electronics.

[20]  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).

[21]  Jan Melkebeek,et al.  Speed sensorless direct torque control of induction motors using an adaptive flux observer , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

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

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

[24]  Lijun Diao,et al.  Optimized Design of Discrete Traction Induction Motor Model at Low-Switching Frequency , 2013 .

[25]  Yongchang Zhang,et al.  Torque ripple reduction of model predictive torque control of induction motor drives , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[26]  J. Miller.  Numerical Analysis , 1966, Nature.

[27]  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.

[28]  C. Lascu,et al.  Combining the principles of sliding mode, direct torque control, and space-vector modulation in a high-performance sensorless AC drive , 2002, IEEE Transactions on Industry Applications.

[29]  Patricio Cortes,et al.  Predictive Control of Power Converters and Electrical Drives: Rodriguez/Predictive Control of Power Converters and Electrical Drives , 2012 .

[30]  W. Marsden.  I and J , 2012 .

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

[32]  Yongchang Zhang,et al.  Model Predictive Direct Power Control of a PWM Rectifier With Duty Cycle Optimization , 2013, IEEE Transactions on Power Electronics.

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