Loss Minimization Control of Linear Induction Motor Drive for Linear Metros

The linear induction motor (LIM) drive in linear metros suffers heavily from low efficiency due to its large air-gap length and the partial load conditions, where high loss appears in both the LIM and the inverter when a constant excitation current is generally required. Worse still, the end-effects, including both the transversal edge-effect and longitudinal end-effect, would lead to the decrease of magnetizing inductance and the increase of secondary resistance, resulting in extra loss and further deterioration of drive efficiency. To reduce the loss of the LIM drive, this paper proposes a novel loss model based loss minimization control (LMC) scheme for LIM drives. First, in the equivalent circuit and the mathematical model of LIM, four coefficients are introduced to evaluate the influence of the end-effects. Based on a thorough analysis of the LIM copper and core losses, together with the inverter conduction and switching losses, a novel integrated loss model of LIM drive is then developed, and an improved LMC scheme to obtain the optimal solution online is proposed to minimize the loss of the LIM drive. The proposed control method is successfully implemented in a 3-kW LIM drive prototype. The effectiveness of the proposed method is validated by the experimental results.

[1]  Iordanis Kioskeridis,et al.  Loss minimization in induction motor adjustable-speed drives , 1996, IEEE Trans. Ind. Electron..

[2]  Qing-Chang Zhong,et al.  Advanced Integrated Modeling and Analysis for Adjustable Speed Drives of Induction Motors Operating With Minimum Losses , 2015, IEEE Transactions on Energy Conversion.

[3]  H. Kurum,et al.  Investigation of End Effects in Linear Induction Motors by Using the Finite-Element Method , 2008, IEEE Transactions on Magnetics.

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

[5]  Lassi Aarniovuori,et al.  Measurements and Simulations of DTC Voltage Source Converter and Induction Motor Losses , 2012, IEEE Transactions on Industrial Electronics.

[6]  Thomas A. Lipo,et al.  Optimal Efficiency Control of an Induction Motor Drive , 1987, IEEE Power Engineering Review.

[7]  Alexander G. Loukianov,et al.  Copper and Core Loss Minimization for Induction Motors Using High-Order Sliding-Mode Control , 2012, IEEE Transactions on Industrial Electronics.

[8]  Yiqi Liu,et al.  A comprehensive analytical power loss model of an induction motor drive system with loss minimization control , 2015, 2015 IEEE International Electric Machines & Drives Conference (IEMDC).

[9]  Stefano Di Gennaro,et al.  Sensorless High Order Sliding Mode Control of Induction Motors With Core Loss , 2014, IEEE Transactions on Industrial Electronics.

[10]  C. Attaianese,et al.  Control improvement of induction motor drives , 1993, Conference Record of the Power Conversion Conference - Yokohama 1993.

[11]  Gianpaolo Vitale,et al.  Closed-Loop MRAS speed observer for linear induction motor drives , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[12]  Wei Xu,et al.  Equivalent Circuit Derivation and Performance Analysis of a Single-Sided Linear Induction Motor Based on the Winding Function Theory , 2012, IEEE Transactions on Vehicular Technology.

[13]  Tong Zhou,et al.  Investigation of Forces and Secondary Losses in Linear Induction Motor With the Solid and Laminated Back Iron Secondary for Metro , 2017, IEEE Transactions on Industrial Electronics.

[14]  Rong-Jong Wai,et al.  Robust Petri Fuzzy-Neural-Network Control for Linear Induction Motor Drive , 2007, IEEE Transactions on Industrial Electronics.

[15]  Robert D. Lorenz,et al.  Loss manipulation capabilities of deadbeat-direct torque and flux control induction machine drives , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[16]  Maria Carmela Di Piazza,et al.  Induction-Machines-Based Wind Generators With Neural Maximum Power Point Tracking and Minimum Losses Techniques , 2016, IEEE Transactions on Industrial Electronics.

[17]  Wei Xu,et al.  Dynamic Loss Minimization of Finite Control Set-Model Predictive Torque Control for Electric Drive System , 2016, IEEE Transactions on Power Electronics.

[18]  Slobodan N. Vukosavic,et al.  A method for transient torque response improvement in optimum efficiency induction motor drives , 2003 .

[19]  Sakutaro Nonaka,et al.  Design of single-sided linear induction motors for urban transit , 1988 .

[20]  Ali M Bazzi,et al.  Review of Methods for Real-Time Loss Minimization in Induction Machines , 2010, IEEE Transactions on Industry Applications.

[21]  S. Lim,et al.  Loss-minimising control scheme for induction motors , 2004 .

[22]  Ion Boldea.  Linear Electric Machines, Drives, and MAGLEVs Handbook , 2013 .

[23]  P. T. Krein,et al.  System-level power loss sensitivity to various control variables in vector-controlled induction motor drives , 2012, 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[24]  Frede Blaabjerg,et al.  Power losses in PWM-VSI inverter using NPT or PT IGBT devices , 1994 .

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

[26]  F. Fernandez-Bernal,et al.  Model-based loss minimization for DC and AC vector controlled motors including core saturation , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[27]  J. Luomi,et al.  Loss-Minimizing Flux Level Control of Induction Motor Drives , 2012, IEEE Transactions on Industry Applications.

[28]  D.M. Divan,et al.  Increasing the dynamic torque per ampere capability of induction machines , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[29]  J.K. Pedersen,et al.  Efficiency optimized control of medium-size induction motor drives , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).