A Variational Approach to MTPA Control of Induction Motor for EVs Range Optimization

The paper presents a control strategy for induction motor which optimizes both efficiency and torque response in both transient and steady state. In the context of vectorial control of induction motor, the optimum problem is defined according to the calculus of variations for a given step change of the reference torque. This allows finding the closed-form analytical solution of the current reference trajectories which minimize the amplitude of the stator current. Simulation and experimental results confirm the validity of the proposed approach that allows getting significant improvements in the drive efficiency. As a consequence, if the induction motor is used in the powertrain of an electric vehicle, the proposed control strategy can determine an increase of the range per charge, as demonstrated by the analysis of a case study.

[1]  S. Sangwongwanich,et al.  Realization of time-optimal single-step velocity response control of field oriented induction machines under the condition of nonsaturation of flux , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[2]  P. Famouri,et al.  Loss minimization control of an induction motor drive , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[3]  Ralph Kennel,et al.  Loss Minimization of Induction Machines in Dynamic Operation , 2013, IEEE Transactions on Energy Conversion.

[4]  Min Ho Park,et al.  A novel technique for optimal efficiency control of current source inverter fed induction motor , 1986, 1986 17th Annual IEEE Power Electronics Specialists Conference.

[5]  Zhang Jian,et al.  A novel MTPA control strategy of induction motor based on torque current compensation , 2016, 2016 19th International Conference on Electrical Machines and Systems (ICEMS).

[6]  Yang Geng,et al.  A Novel Torque Control Strategy of Induction Motors Taking Efficiency of Dynamic State into Account , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[7]  Cleve Moler,et al.  Mathematical Handbook for Scientists and Engineers , 1961 .

[8]  V. Horga,et al.  Optimal control of electrical drives with induction motors for variable torques , 2008, 2008 13th International Power Electronics and Motion Control Conference.

[9]  Michelle Becker,et al.  Power Electronics And Ac Drives , 2016 .

[10]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[11]  Jaime Rodriguez Arribas,et al.  Optimal Regulation of Electric Drives With Constant Load Torque , 2006, IEEE Transactions on Industrial Electronics.

[12]  Byung Kook Kim,et al.  Minimum-time minimum-loss speed control of induction motors under field-oriented control , 1997, IEEE Trans. Ind. Electron..

[13]  S. Brendle,et al.  Calculus of Variations , 1927, Nature.

[14]  Werner Leonhard,et al.  Control of Electrical Drives , 1990 .

[15]  R.D. Lorenz,et al.  Efficiency-optimized flux trajectories for closed cycle operation of field oriented induction machine drives , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[16]  Donald W. Novotny,et al.  Minimizing Induction Motor Losses by Excitation Control in Variable Frequency Drives , 1984, IEEE Transactions on Industry Applications.

[17]  Carlos Canudas de Wit,et al.  Optimal torque control for current-fed induction motors , 1999, IEEE Trans. Autom. Control..

[18]  M.N. Uddin,et al.  New Online Loss-Minimization-Based Control of an Induction Motor Drive , 2008, IEEE Transactions on Power Electronics.