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RECENT JOURNAL PAPERS

    2020

  1. D. Perez-Estevez, and J. Doval-Gandoy, "A Finite-Control-Set Linear Current Controller With Fast Transient Response and Low Switching Frequency for Grid-Tied Inverters", IEEE Transactions on Industry Applications, accepted for publication.
  2. A. G. Yepes, J. Doval-Gandoy, and H. A. Toliyat, , "Strategy With Smooth Transitions and Improved Torque-Speed Region and Stator Copper Loss for Two-Level Asymmetrical Six-Phase Induction Motor Drives Under Switch Faults", IEEE Transactions on Power Electronics, accepted for publication.
  3. A. G. Yepes, and J. Doval-Gandoy, "Effective Current Limitation for Multifrequency Current Control With Distortion-Free Voltage Saturation and Antiwindup", IEEE Transactions on Power Electronics, accepted for publication.
  4. F. M. Rahman, V. Pirsto, J. Kukkola, M. Hinkkanen, D. Perez-Estevez and J. Doval-Gandoy, "Equivalence of the Integrator-Based and Disturbance-Observer-Based State-Space Current Controllers for Grid Converters", IEEE Transactions on Industrial Electronics, accepted for publication.
  5. M. Ayala J. Doval-Gandoy, J. Rodas, O. Gonzalez, R. Gregor, and M. Rivera "A Novel Modulated Model Predictive Control Applied to Six-Phase Induction Motor Drives", IEEE Transactions on Industrial Electronics, accepted for publication.
  6. A. G. Yepes, J. Doval-Gandoy and H. A. Toliyat, "Improvement in DC-Link Utilization With Reduced Current and Torque Deterioration for Five-Phase Drives by Combination of Circulating-Current Filters and Simple Carrier-Based PWM Based on Closed-Form Expressions", IEEE Transactions on Industrial Electronics, accepted for publication.
  7. Y. Kali, M. Ayala, J. Rodas M. Saad, J. Doval-Gandoy, R. Gregor, and K. Benjelloun, "Time Delay Estimation based Discrete-Time Super-Twisting Current Control for a Six-Phase Induction Motor", IEEE Transactions on Power Electronics, vol. 35, no. 11, pp. 12570-12580, Nov. 2020..
  8. O. López, J. Álvarez, A. G. Yepes, F. Baneira, D. Pérez-Estévez, F. D. Freijedo and J. Doval-Gandoy, "Carrier-Based PWM Equivalent to Multilevel Multiphase Space Vector PWM Techniques", IEEE Transactions on Industrial Electronics, vol. 67, no. 7, pp. 5220-5231, Jul. 2020.
  9. A. G. Yepes, J. Doval-Gandoy, F. Baneira and and H. A. Toliyat, "Comparison of Stator Winding Connections in Multiphase Drives Under Healthy Operation and With One Open Converter Leg", IET Electric Power Applications, vol. 14, no. 4, pp. 584-596, Apr. 2020.
  10. M. Ayala, J. Doval-Gandoy, J. Rodas, O. Gonzalez, and R. Gregor, "Current control designed with model based predictive control for six-phase motor drives"", ISA Transactions, vol. 98, pp. 496-504, Mar. 2020.
  11. F. Baneira, J. Doval-Gandoy, A. G. Yepes and O. López, "DC-Current Injection With Minimum Torque Ripple in Interior Permanent-Magnet Synchronous Motors", IEEE Transactions on Power Electronics, vol. 35, no. 2, pp. 1176-1181, Feb. 2020.
  12. D. Perez-Estevez, J. Doval-Gandoy, and J. M. Guerrero, "AC-Voltage Harmonic Control for Stand-Alone and Weak-Grid-Tied Converter", IEEE Transactions on Industry Applications, vol. 56, no. 1, pp. 403-421, Jan.-Feb. 2020.
  13. 2019

  14. Y. Kali, M. Saad, J. Doval-Gandoy, J. Rodas and K. Benjelloun, "Discrete sliding mode control based on exponential reaching law and time delay estimation for an asymmetrical six-phase induction machine drive", IET Electric Power Applications, vol. 13, no. 11, pp. 1660-1671, Nov. 2019.
  15. A. G. Yepes, J. Doval-Gandoy and H. A. Toliyat, "Multifrequency Current Control for n-Phase Machines Including Antiwindup and Distortion-Free Saturation With Full DC-Bus Utilization", IEEE Transactions on Power Electronics, vol. 34, no. 10, pp. 9891-9904, Oct. 2019.
  16. D. Perez-Estevez, and J. Doval-Gandoy, "Grid-Tied Inverter With AC Voltage Sensorless Synchronization and Soft Start", IEEE Transactions on Industry Applications, vol. 55, no. 5, pp. 4920-4933, Sept.-Oct. 2019.
  17. O. Gonzalez, M. Ayala, J. Doval-Gandoy, J. Rodas, R. Gregor, and M. Rivera, "Predictive-Fixed Switching Current Control Strategy Applied to Six-Phase Induction Machine"", MDPI Energies, vol. 12, no. 12, pp. 1-14, Jun. 2019.
  18. F. Baneira, L. Asiminoaei, J. Doval-Gandoy, H. Delpino, A. G. Yepes, and J. Godbersen, "Estimation Method of Stator Winding Resistance for Induction-Motor Drives Based on DC-Signal Injection Suitable for Low Inertia", IEEE Transactions on Power Electronics, vol. 34, no. 6, pp. 5646-5654, Jun. 2019.
  19. A. Morya, M. C. Gardner, B. Anvari, L. Liu, A. G. Yepes, J. Doval-Gandoy and H. A. Toliyat, "Wide Bandgap Devices in AC Electric Drives: Opportunities and Challenges", IEEE Transactions on Transportation Electrification, vol. 5, no. 1, pp. 3-20, Mar. 2019.
  20. A. Negahdari, A. G. Yepes, J. Doval-Gandoy and H. A. Toliyat, "Efficiency Enhancement of Multiphase Electric Drives at Light-Load Operation Considering Both Converter and Stator Copper Losses", IEEE Transactions on Power Electronics, vol. 34, no. 2, pp. 1518-1525, Feb. 2019.
  21. Y. Kali, M. Ayala, J. Rodas, M. Saad, J. Doval-Gandoy, R. Gregor, and K. Benjelloun, "Current Control of a Six-Phase Induction Machine Drive based on Discrete-Time Sliding Mode with Time Delay Estimation"", MDPI Energies, vol. 12, no. 1, pp. 1-17, Jan. 2019.
  22. 2018

  23. A. G. Yepes, J. Doval-Gandoy, F. Baneira and H. Toliyat, "Control Strategy for Dual Three-Phase Machines With Two Open Phases Providing Minimum Loss in the Full Torque Operation Range", IEEE Transactions on Power Electronics, vol. 33, no. 12, pp. 10044-10050, Dec. 2018.
  24. D. Pérez-Estévez, J. Doval-Gandoy, A. G. Yepes and O. López, "Generalized Multi-Frequency Current Controller for Grid-Connected Converters With LCL Filter", IEEE Transactions on Industry Applications, vol. 54, no. 5, pp. 4537-4553, Sep./Oct. 2018.
  25. A. G. Yepes, J. Doval-Gandoy and H. Toliyat, "Multifrequency Current Control Including Distortion-Free Saturation and Anti-Windup With Enhanced Dynamics", IEEE Transactions on Power Electronics, vol. 33, no. 9, pp. 7309-7313, Sep. 2018.
  26. A. G. Yepes, J. Doval-Gandoy, F. Baneira and H. Toliyat, "Speed Estimation Based on Rotor Slot Harmonics in Multiphase Induction Machines Under Open-Phase Fault", IEEE Transactions on Power Electronics, vol. 33, no. 9, pp. 7980-7993, Sep. 2018.
  27. D. Pérez-Estévez, J. Doval-Gandoy, A. G. Yepes, O. López and F. Baneira, "Enhanced Resonant Current Controller for Grid-Connected Converters With LCL Filter", IEEE Transactions on Power Electronics, vol. 33, no. 5, pp. 3765-3778, May 2018.
  28. 2017

  29. A. G. Yepes, J. Doval-Gandoy, F. Baneira , D. Pérez-Estévez and O. López, "Current Harmonic Compensation for n-Phase Machines With Asymmetrical Winding Arrangement and Different Neutral Configurations", IEEE Transactions on Industry Applications, vol. 53, no. 6, pp. 5426 - 5439, Nov./Dec. 2017.
  30. F. Baneira, J. Doval-Gandoy, A. G. Yepes, O. López and D. Pérez-Estévez, "Comparison of Postfault Strategies for Current Reference Generation for Dual Three-Phase Machines in Terms of Converter Losses", IEEE Transactions on Power Electronics, vol. 32, no. 11, pp. 8243-8246, Nov. 2017.
  31. D. Pérez-Estévez, J. Doval-Gandoy, A. G. Yepes and O. López, "Positive- and Negative-Sequence Current Controller With Direct Discrete-Time Pole Placement for Grid-Tied Converters With LCL Filter", IEEE Transactions on Power Electronics, vol. 32, no. 9, pp. 7207-7221, Sep. 2017.
  32. F. Baneira, J. Doval-Gandoy, A. G. Yepes, O. López and D. Pérez-Estévez, "Control Strategy for Multiphase Drives With Minimum Losses in the Full Torque Operation Range Under Single Open-Phase Fault", IEEE Transactions on Power Electronics, vol. 32, no. 8, pp. 6275–6285, Aug. 2017.
  33. 2016

  34. O. López, J. Álvarez, J. Malvar, A. G. Yepes, A. Vidal, F. Baneira, D. Pérez-Estévez, F. D. Freijedo and J. Doval-Gandoy, "Space Vector PWM With Common-Mode Voltage Elimination for Multiphase Drives", IEEE Transactions on Power Electronics, Vol. 31, no. 12, pp. 8151-8161, Dec. 2016.
  35. A. G. Yepes, F. Baneira, J. Malvar, A. Vidal, D. Pérez-Estévez, O. López, and J. Doval-Gandoy, "Selection Criteria of Multiphase Induction Machines for Speed-Sensorless Drives Based on Rotor Slot Harmonics", IEEE Transactions on Industrial Electronics, Vol. 63, no. 8, pp. 4663-4673, Aug. 2016.
  36. F. Baneira, A. G. Yepes, O. López and J. Doval-Gandoy, "Estimation Method of Stator Winding Temperature for Dual Three-Phase Machines Based on DC-Signal Injection", IEEE Transactions on Power Electronics, Vol. 31, no. 7, pp. 5141-5148, Jul. 2016.
  37. S. Golestan, A. Vidal, A. G. Yepes, J. M. Guerrero, J. C. Vasquez and J. Doval-Gandoy, "A True Open-Loop Synchronization Technique", IEEE Transactions on Industrial Informatics, Vol. 12, no. 3, pp. 1093-1103, Jun. 2016.
  38. S. Golestan, J. M. Guerrero, A. Vidal, A. G. Yepes and J. Doval-Gandoy, "PLL with MAF-Based Prefiltering Stage: Small-Signal Modeling and Performance Enhancement", IEEE Transactions on Power Electronics, Vol. 31, no. 6, pp. 4013-4019, Jun. 2016.
  39. S. Golestan, J. M. Guerrero, A. Vidal, A. G. Yepes, J. Doval-Gandoy and F. D. Freijedo, "Small-Signal Modeling, Stability Analysis and Design Optimization of Single-Phase Delay-Based PLLs", IEEE Transactions on Power Electronics, Vol. 31, no. 5, pp. 3517-3527, May 2016.
  40. L. Harnefors, A. G. Yepes, A. Vidal and J. Doval-Gandoy, "Multifrequency Current Control With Distortion-Free Saturation", IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 4, no. 1, pp. 116-125, Mar. 2016.
  41. S. Golestan, F. D. Freijedo, A. Vidal, A. G. Yepes, J. M. Guerrero and J. Doval-Gandoy, "An Efficient Implementation of Generalized Delayed Signal Cancellation PLL", IEEE Transactions on Power Electronics, vol. 31, no. 2, pp. 1085-1094, Feb. 2016.
  42. 2015

  43. A. Vidal, A. G. Yepes, F. D. Freijedo, O. López, J. Malvar, F. Baneira and J. Doval-Gandoy, "A Method for Identification of the Equivalent Inductance and Resistance in the Plant Model of Current-Controlled Grid-Tied Converters", IEEE Transactions on Power Electronics, vol. 30, no. 12, pp. 7245-7261, Dec. 2015.
  44. F. D. Freijedo, A. Vidal, A. G. Yepes, J. M. Guerrero, O. López, J. Malvar and J. Doval-Gandoy, "Tuning of Synchronous-Frame PI Current Controllers in Grid-Connected Converters Operating at a Low Sampling Rate by MIMO Root Locus", IEEE Transactions on Industrial Electronics, vol. 62, no. 8, pp. 5006-5017, Aug. 2015.
  45. A. G. Yepes, J. Malvar, A. Vidal, O. López and J. Doval-Gandoy, "Current Harmonics Compensation Based on Multi-Resonant Control in Synchronous Frames for Symmetrical n-Phase Machines", IEEE Transactions on Industrial Electronics, vol. 62, no. 5, pp. 2708-2720, May 2015.
  46. A. Vidal, A. G. Yepes, F. D. Freijedo, J. Malvar, O. López and J. Doval-Gandoy, "A Technique to Estimate the Equivalent Loss Resistance of Grid-Tied Converters for Current Control Analysis and Design", IEEE Transactions on Power Electronics, vol. 30, no. 3, pp. 1747-1761, Mar. 2015.
  47. L. Harnefors, A. G. Yepes, A. Vidal and J. Doval-Gandoy, "Passivity-Based Controller Design of Grid-Connected VSCs for Prevention of Electrical Resonance Instability", IEEE Transactions on Industrial Electronics, vol. 62, no. 2, pp. 702-710, Feb. 2015.
  48. 2014

  49. S. Golestan, F. Freijedo, A. Vidal, J. Guerrero and J. Doval-Gandoy, "A Quasi-Type-1 Phase-Locked Loop Structure", IEEE Transactions on Power Electronics, vol. 29, no. 12, pp. 6264-6270, Dec. 2014.
  50. L. Harnefors, A. G. Yepes, A. Vidal and J. Doval-Gandoy, "Passivity-Based Stabilization of Resonant Current Controllers With Consideration of Time Delay", IEEE Transactions on Power Electronics, vol. 29, no. 12, pp. 6260-6263, Dec. 2014.
  51. A. Vidal, F. D. Freijedo, A. G. Yepes, J. Malvar, O. López and J. Doval-Gandoy, "Transient Response Evaluation of Stationary-Frame Resonant Current Controllers for Grid-Connected Applications", IET Power Electronics, vol. 7, no. 7, pp. 1714-1724, Jul. 2014.
  52. A. G. Yepes, A. Vidal, O. López and J. Doval-Gandoy, "Evaluation of Techniques for Cross-Coupling Decoupling Between Orthogonal Axes in Double Synchronous Reference Frame Current Control", IEEE Transactions on Industrial Electronics, vol. 61, no. 7, pp. 3527-3531, Jul. 2014.
  53. A. G. Yepes, A. Vidal, J. Malvar, O. López and J. Doval-Gandoy, "Tuning Method Aimed at Optimized Settling Time and Overshoot for Synchronous Proportional-Integral Current Control in Electric Machines", IEEE Transactions on Power Electronics, vol. 29, no. 6, pp. 3041-3054, Jun. 2014.
  54. J. Malvar, O. López, A. G. Yepes, A. Vidal, F. D. Freijedo, P. Fernández-Comesaña and J. Doval-Gandoy, "Graphical diagram for subspace and sequence identification of harmonics in symmetrical multiphase machines", IEEE Transactions on Industrial Electronics, vol. 61, no. 1, pp. 29–42, Jan. 2014.
  55. 2013

  56. A. Vidal, F. D. Freijedo, A. G. Yepes, O. López, P. Fernández-Comesaña, J. Malvar and J. Doval-Gandoy, "Assessment and Optimization of the Transient Response of Proportional-Resonant Current Controllers for Distributed Power generation Systems", IEEE Transactions on Industrial Electronics, vol. 60, no. 4, pp. 1367–1383, Apr. 2013.
  57. 2012

  58. A. G. Yepes, J. A. Riveros, J. Doval-Gandoy, F. Barrero, O. López, B. Bogado, M. Jones and E. Levi "Parameter Identification of Multiphase Induction Machines with Distributed Windings - Part 1: Sinusoidal Excitation Methods", IEEE Transactions on Energy Conversion, vol. 27, no. 4, pp. 1056–1066, Dec. 2012.
  59. J. A. Riveros, A. G. Yepes, F. Barrero, J. Doval-Gandoy, B. Bogado, O. López, M. Jones and E. Levi "Parameter Identification of Multiphase Induction Machines with Distributed Windings - Part 2: Time Domain Techniques", IEEE Transactions on Energy Conversion, vol. 27, no. 4, pp. 1067–1077, Dec. 2012.
  60. A. G. Yepes, F. D. Freijedo, J. Doval-Gandoy, O. López, J. Malvar & Pablo Fernandez-Comesaña, "Correction to "Effects of discretization methods on the performance of resonant controllers"", IEEE Transactions on Power Electronics, vol. 27, no. 12, pp. 4976, Dec.2012.
  61. A. G. Yepes, F. D. Freijedo, O. López & J. Doval-Gandoy, "Correction to "High performance digital resonant controllers implemented with two integrators"", IEEE Transactions on Power Electronics, vol. 27, no. 2, pp. 4357, Oct. 2012.
  62. Pablo Fernandez-Comesaña, F. D. Freijedo, J. Doval-Gandoy, O. López, A. G. Yepes & J. Malvar, "Mitigation of Voltage Sags, Imbalances and Harmonics in Sensitive Industrial Loads by Means of a Series Power Line Conditioner", Electric Power Systems Research, vol. 84, no. 1, pp. 20-30, Mar. 2012.
  63. 2011

  64. A. G. Yepes, F. D. Freijedo, O. López & J. Doval-Gandoy, "Analysis and Design of Resonant Current Controllers for Voltage Source Converters by Means of Nyquist Diagrams and Sensitivity Function", IEEE Transactions on Industrial Electronics, vol. 58, no. 11, pp. 5231-5250, Nov. 2011.
  65. F. D. Freijedo, A. G. Yepes, O. López, Pablo Fernandez-Comesaña & J. Doval-Gandoy, "An optimized implementation of phase locked loops for grid applications", IEEE Transactions on Instrumentation and Measurement, vol. 60, no. 9, pp. 3110–3119, Sep. 2011.
  66. Jacobo Álvarez, Óscar López, Francisco D. Freijedo & Jesús Doval-Gandoy, "Digital parameterizable VHDL module for multilevel multiphase space vector PWM" IEEE Transactions on Industrial Electronics, vol. 58, no. 11, pp. 3946-3957, Sep. 2011.
  67. Alfonso Lago, Carlos M. Peñalver, Jorge Marcos, Jesús Doval-Gandoy, Andrés Nogueiras, Óscar López, Francisco D. Freijedo, José Manuel Vilas & José Carlos Lorenzo, "Electrical design automation of a twisted pair to optimize the manufacturing process" IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 8, no. 1, pp. 1269-1281, Aug. 2011.
  68. F. D. Freijedo, A. G. Yepes, J. Malvar, O. López, Pablo Fernandez-Comesaña, A. Vidal & J. Doval-Gandoy, "Frequency tracking of digital resonant filters for control of power converters connected to public distribution systems", IET Power Electronics, vol. 4, no. 4, pp. 454–462, Apr. 2011.
  69. A. G. Yepes, F. D. Freijedo, O. López & J. Doval-Gandoy, "High performance digital resonant controllers implemented with two integrators", IEEE Transactions on Power Electronics, vol. 26, no. 2, pp. 563–576, Feb. 2011.
  70. Óscar López, Drazen Dujic, Martin Jones, Francisco D. Freijedo, Jesús Doval-Gandoy & Emil Levi, "Multidimensional two-level multiphase space vector PWM algorithm and its comparison with multifrequency space vector PWM method", IEEE Transactions on Industrial Electronics, vol. 58, no. 2, pp. 465-475, Feb. 2011.
  71. F. D. Freijedo, A. G. Yepes, O. López, A. Vidal & J. Doval-Gandoy, " Three-phase PLLs with fast post-fault re-tracking and steady-state rejection of voltage unbalance and harmonics by means of lead compensation", IEEE Transactions on Power Electronics, vol. 26, no. 1, pp. 85–97, Jan. 2011.
  72. 2010

  73. A. G. Yepes, F. D. Freijedo, J. Doval-Gandoy, O. López, J. Malvar & Pablo Fernandez-Comesaña, "Effects of discretization methods on the performance of resonant controllers", IEEE Transactions on Power Electronics, vol. 25, no. 7, pp. 1692-1712, Jul. 2010.
  74. José Ignacio León, Óscar López, Leopoldo García Franquelo, Jesús Doval-Gandoy, Sergio Vázquez, Jacobo Álvarez & Francisco Daniel Freijedo, "Multilevel multiphase feed-forward space vector modulation technique", IEEE Transactions on Industrial Electronics, vol. 57, no. 6, pp. 2026-2075, June 2010.
  75. Ana M. Cao, Jorge Marcos, Alfredo del Río, Carlos M. Peñalver, Alfonso Lago, Andrés A. Nogueiras and Jesús Doval-Gandoy, "A Multi-Point Sensor Based on Optical Fiber for the Measurement of Electrolyte Density in Lead-Acid Batteries" Sensors, vol 10, no. 3, pp. 2587-2608, Mar. 2010.
  76. O. López, F. D. Freijedo, A. G. Yepes, P. Fernández-Comesaña, J. Malvar, R. Teodorescu & J. Doval-Gandoy, "Eliminating ground current in a transformerless photovoltaic application", IEEE Transactions on Energy Conversion, vol. 25, no. 1, pp. 140-147, Mar. 2010.
  77. A. G. Yepes, F. D. Freijedo, J. Doval-Gandoy, O. López, P. Fernández-Comesaña & J. Malvar, "Harmonic identification algorithms based on DCT for power quality applications", ETRI Journal, vol. 32, no. 1, pp. 33-43, Feb. 2010.
  78. 2009

  79. Francisco D. Freijedo, Jesús Doval-Gandoy, O. López & Enrique Acha, "Tuning of phase locked loops for power converters under distorted utility conditions", IEEE Transactions on Industry Applications, vol. 45, no. 6, pp. 2039-2047, Nov. 2009.
  80. Francisco D. Freijedo, Jesús Doval-Gandoy, O. López & Carlos Martinez-Peñalver, "A signal processing adaptive algorithm for selective current harmonic cancellation in active power filters", IEEE Transactions on Industrial Electronics, vol. 56, no. 8, pp. 2829-2840, Aug. 2009.
  81. O. López, Emil Levi, Francisco D. Freijedo & Jesús Doval-Gandoy, "Number of switching state vectors and space vectors in multilevel multiphase converters", Electronics Letters, vol. 45, no. 10, pp. 524-525, May 2009.
  82. O. López, Jacobo Álvarez, Jesús Doval-Gandoy & Francisco D. Freijedo, "Multilevel multiphase space vector PWM algorithm with switching state redundancy", IEEE Transactions on Industrial Electronics, vol. 56, no. 3, pp. 792-804, Mar. 2009.
  83. Alfonso Lago, Carlos M. Peñalver, Jorge Marcos, Jesús Doval-Gandoy, Andrés Nogueiras, O. López, Félix Santiago, Francisco D. Freijedo, José Manuel Vilas & José Carlos Lorenzo, "Geometric analysis and manufacturing considerations for optimizing the characteristics of a twisted pair", IEEE Transactions on Electronics Packaging Manufacturing, vol. 32, no. 1, pp. 22-31, Jan. 2009.
  84. Francisco D. Freijedo, Jesús Doval-Gandoy, O. López & Enrique Acha, "A generic open loop algorithm for three phase grid voltage/current synchronization with particular reference to phase, frequency and amplitude estimation" IEEE Transactions on Power Electronics, vol. 24, no. 1, pp. 94-107, Jan. 2009.
  85. 2008

  86. O. López, Jacobo Álvarez, Jesús Doval-Gandoy & Francisco D. Freijedo, "Multilevel multiphase space vector PWM algorithm" IEEE Transactions on Industrial Electronics, vol. 55, no. 5, pp. 1933-1942, May 2008.
  87. O. López, Jacobo Álvarez, Jesús Doval-Gandoy, Francisco D. Freijedo, Andrés Nogueiras, Alfonso Lago & Carlos M. Peñalver, "Comparison of the FPGA implementation of two multilevel space vector PWM algorithms" IEEE Transactions on Industrial Electronics, vol. 55, no. 4, pp. 1537-1547, Apr. 2008.
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