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Conferences

Fault-tolerant technique for ∆-connected AC motor-drives

Ahmed Sayed-Ahmed, Behrooz Mirafzal, and Nabeel Demerdash, IEEE Transactions on Energy Conversion, (in press), to appear in 2011. (Available in the IEEE Xplore)

Abstract- A fault-tolerant technique for motor-drive systems is introduced in this paper. The technique is merely presented for AC motors with Δ-connected circuits in their stator windings. In this technique, the faulty phase is isolated by solid-state switches after the occurrence of a failure in one of the stator phases. Then, the fault-tolerant technique manages current-flow in the remaining healthy phases. This technique is to significantly mitigate torque pulsations, which are caused by an open-Δ configuration in the stator windings. The performance of the fault-tolerant technique was experimentally verified using a 5-hp 460V induction motor-drive system and the results are presented in this paper.

Stability analysis of the three-phase single-stage boost inverter

Ali Kaviani and Behrooz Mirafzal, “Stability analysis of the three-phase single-stage boost inverter,” IEEE APEC Conference, Long Beach, CA, March 17-21, 2013.

Regenerative energy management for pulse-loads in dual DC-AC micro-grid

Mahdi Saghaleini, Behrooz Mirafzal, and Chris Edrington, “Regenerative energy management for pulse-loads in dual DC-AC micro-grids,” IEEE IECON Conference, Phoenix, AZ, November 7-10, 2010.

Effects of different switching algorithm on the thermal behavior of IGBT modules under pulse-load conditions

Arash Nejadpak, Behrooz Mirafzal, and Osama Mohammed, “Effects of different switching algorithm on the thermal behavior of IGBT modules under pulse-load conditions,” the IEEE IECON Conference, Phoenix, AZ, November 7-10, 2010.

On power-sharing of solar-based hybrid motor-drive systems

Brian Hadley, Behrooz Mirafzal, and Dan Ionel, “On power-sharing of solar-based hybrid motor-drive systems,” IEEE ECCE Conference, Atlanta, GA September 12-16, 2010

Inter-turn fault diagnosis of PM synchronous generator for variable speed wind applications using floating space vector

Ali Sarikhani, Behrooz Mirafzal, and Osama Mohammed, “Inter-turn fault diagnosis of PM synchronous generator for variable speed wind applications using floating space vector,” IEEE IECON Conference, Phoenix, AZ, November 7-10, 2010.

A Time-Coordination Approach for Regenerative Energy Saving in Multi-Axis Motor-Drive Systems

Ali K. Kaviani, Brian Hadley, and Behrooz Mirafzal, IEEE Transactions on Power Electronics, (in press), Early Access IEEE Xplore 2011.

Abstract- An analytical approach for the management of regenerative energies in multi-axis servo-motor-drives is presented in this paper. This energy management is achieved through a proper time-coordination between the speed commands of multi-axis drives. Moreover, the proposed approach significantly limits the peak value of the AC input current in these systems. It is mathematically proved that a time-delay can significantly increase the amount of utilized regenerative energy and consequently decreases the amount of dissipated energy. In this paper, a set of closed-form formulas is developed for different acceleration-deceleration time ratios, where motor losses are neglected. The findings of this investigation were experimentally verified using a two-axis permanent-magnet (PM) motor-drive system, and the results are presented in this paper. The experimental results are in remarkable agreement with the developed closed-form formulas.

A DC-bus voltage regulation for parallel wind-based synchronous generators

Mahmoud Amin, Behrooz Mirafzal, and Osama Mohammed, “A DC-bus voltage regulation for parallel wind-based synchronous generators,” IEEE IECON Conference, Phoenix, AZ, November 7-10, 2010.

Permanent magnet motor-drive frequency response characteristics for transient phenomena and conducted EMI analysis

Mark Gries, and Behrooz Mirafzal, “Permanent magnet motor-drive frequency response characteristics for transient phenomena and conducted EMI analysis,” IEEE Applied Power Electronics Conference, APEC, February 24-28 2008, Austin, TX.

Optimal load coordination in a hybrid bi-axis drive system using genetic

Ali Kashefi, Behrooz Mirafzal, and Osama Mohammed, “Optimal load coordination in a hybrid bi-axis drive system using genetic algorithm,” IEEE IECON Conference, Phoenix, AZ, November 7-10, 2010.

Pulse-load effects on notional ship power system stability

Vahid Sahehi, Behrooz Mirafzal, and Osama Mohammed, “Pulse-load effects on notional ship power system stability,” the IEEE IECON Conference, Phoenix, AZ, November 7-10, 2010.

A failure mode for PWM inverter-fed AC motors due to the anti-resonance phenomenon

Behrooz Mirafzal, Gary Skibinski, and Ranga Tallam, “A failure mode for PWM inverter-fed AC motors due to the anti-resonance phenomenon,” IEEE IAS Annual Meeting Conference in Edmonton, October 5-9, 2008, Edmonton, Canada.

Determination of parameters in the universal induction motor model

Behrooz Mirafzal, Gary Skibinski, and Ranga Tallam, “Determination of parameters in the universal induction motor model,” IEEE IAS Annual Meeting Conference, 42nd IEEE IAS Annual Meeting, New Orleans, pp.1207 - 1216 October 2007.

Universal induction motor model with low-to-high frequency response characteristics

Behrooz Mirafzal, Gary Skibinski, Ranga Tallam, David Schlegel, and Richard Lukaszewski, “Universal induction motor model with low-to-high frequency response characteristics,” IEEE IAS Annual Meeting Conference, 41st IEEE IAS Annual Meeting, Tampa, vol.1, pp.423-433, October 2006.

Analysis of stator winding inter-turn short-circuit faults in poly-phase induction machines for identification of the faulty phase and estimation of the fault severity

Ahmed Sayed-Ahmed, ChiaChou Yeh, Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Analysis of stator winding inter-turn short-circuit faults in poly-phase induction machines for identification of the faulty phase and estimation of the fault severity,” IEEE IAS Annual Meeting Conference, 41st IEEE IAS Annual Meeting, Tampa, vol.3 ,pp.1519-1524 , October 2006.

On innovative methods of induction motor inter-turn and broken-bar fault diagnostics (Invited Paper)

Behrooz Mirafzal, and Nabeel A.O. Demerdash, “On innovative methods of induction motor inter-turn and broken-bar fault diagnostics,” IEEE International Electric Machines and Drives Conference, IEMDC'05 San Antonio, pp.762-769, May 2005.

A Condition monitoring vector database approach for broken bar fault diagnostics of induction machines

ChiaChou Yeh, Behrooz Mirafzal, Richard Povinelli, and Nabeel A.O. Demerdash, “A Condition monitoring vector database approach for broken bar fault diagnostics of induction machines,” IEEE International Electric Machines and Drives Conference, IEMDC'05 San Antonio, pp.29-34, May 2005.

Effects of load on diagnosing broken bar faults in induction motors using the pendulous oscillation of the rotor magnetic field orientation

Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Effects of load on diagnosing broken bar faults in induction motors using the pendulous oscillation of the rotor magnetic field orientation,” IEEE IAS Annual Meeting Conference, 39th IEEE IAS Annual Meeting, Seattle, vol.2, pp.699-707, October 2004.

Soft started induction motor modeling and heating issues for different starting profiles using a flux linkage ABC-frame of reference

Mark Solveson, Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Soft started induction motor modeling and heating issues for different starting profiles using a flux linkage ABC-frame of reference,” IEEE IAS Annual Meeting Conference, 39th IEEE IAS Annual Meeting, Seattle, vol.1, pp.18-25, October 2004.

Condition monitoring of squirrel-cage induction motors fed by PWM -based drives using a parameter estimation approach

Behrooz Mirafzal, Fariba Fateh, Chiachou Yeh, Richard Povinelli, and Nabeel A.O. Demerdash, “Condition monitoring of squirrel-cage induction motors fed by PWM -based drives using a parameter estimation approach,” International Conference on Power System Technology, Singapore, vol.2, pp.1579-1584, November 2004.

Application of optimal fuzzy PID controller design: PI control for nonlinear induction motor

Jingwei Xu, Xin Feng, Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Application of optimal fuzzy PID controller design: PI control for nonlinear induction motor,” The Sixth World Congress on Intelligent Control and Automation, 2006. China, pp.3953-3957, June 2006.

Induction machine fault diagnosis using the rotor magnetic field space vector orientation

Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Induction machine fault diagnosis using the rotor magnetic field space vector orientation,” IEEE IAS Annual Meeting Conference, 38th IEEE IAS Annual Meeting Salt Lake City, vol.3, pp.1847-1854, October 2003.

Effects of inductance nonlinearities in a transformer-rectifier DC motor drive system on the AC side harmonic distortion using a time-stepping coupled finite element-circuit technique

Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Effects of inductance nonlinearities in a transformer-rectifier DC motor drive system on the AC side harmonic distortion using a time-stepping coupled finite element-circuit technique,” IEEE International Electric Machines and Drives Conference, IEMDC'03 Wisconsin-Madison, vol.3, pp.1755-1759, June 2003.

A nonlinear controller for current source inverter induction motor drive systems

Behrooz Mirafzal, and Nabeel A.O. Demerdash, “A nonlinear controller for current source inverter induction motor drive systems,” IEEE International Electric Machines and Drives Conference, IEMDC'03 Wisconsin-Madison, vol.3, pp.1491-1497, June 2003.

Diagnosis of stator winding inter-turn shorts in induction motors fed by PWM-inverter drive systems using a time-series data mining technique

Chiachou Yeh, Richard Povinelli, Behrooz Mirafzal, and Nabeel A.O. Demerdash, “Diagnosis of stator winding inter-turn shorts in induction motors fed by PWM-inverter drive systems using a time-series data mining technique,” International Conference on Power System Technology, Singapore, vol.1, pp.891-896, November 2004.

Improvement of transient stability using a thyristor controlled series compensator

Ghadir Radman, and Behrooz Mirafzal, “Improvement of transient stability using a thyristor controlled series compensator,” 31st Southeastern Symposium on System Theory, SSST’99 Alabama, pp. 219-221, March 1999.

Voltage stability improvement for wind farms using shunt FACTS devices based on dynamic modeling

Vahid Salehi, Saeed Afsharnia, and Behrooz Mirafzal, International Journal of Distributed Energy Resources, ISSN 1614-7138, vol.6, no. 2, pp. 109-130, April-June 2010.

A failure mode for PWM inverter-fed AC motors due to the antiresonance phenomenon

Behrooz Mirafzal, Gary Skibinski, and Ranga Tallam, IEEE Transactions on Industry Applications, vol.45, pp. 1697-1705, September/October 2009.

Universal induction motor model with low-to-high frequency response characteristics

Behrooz Mirafzal, Gary Skibinski, Ranga Tallam, David Schlegel, and Richard Lukaszewski,  IEEE Transactions on Industry Applications, vol.43, pp. 1233 - 1246, September/October 2007. (IEEE Society Prize Paper)

Determination of parameters in the universal induction motor model

Behrooz Mirafzal, Gary Skibinski, and Ranga Tallam, IEEE Transactions on Industry Applications, vol.45, pp. 142 - 151, January /February 2009.

Inter-turn fault diagnosis in induction motors using pendulous oscillation phenomenon

Behrooz Mirafzal, Richard Povinelli, and Nabeel A.O. Demerdash, IEEE Transactions on Energy Conversion, vol.21, pp.871-882, December 2006.

On innovative methods of induction motor inter-turn and broken-bar fault diagnostics

Behrooz Mirafzal, and Nabeel A.O. Demerdash, IEEE Transactions on Industry Applications, vol.42, pp.405-414, March/April 2006.

Soft started induction motor modeling and heating issues for different starting profiles using a flux linkage ABC-frame of reference

Mark Solveson, Behrooz Mirafzal, and Nabeel A.O. Demerdash, IEEE Transactions on Industry Applications, vol.42, pp.973-982, July/August 2006.

Effects of load magnitude on diagnosing broken bar faults in induction motors using the pendulous oscillation of the rotor magnetic field orientation

Behrooz Mirafzal, and Nabeel A.O. Demerdash, IEEE Transactions on Industry Applications, vol.41, pp.771-783, May/June 2005.

On the oscillation problem of second nonlinear Euler type differential equations

Mohsen Mirafzal, and Behrooz Mirafzal, International Journal of Differential Equations and Applications, vol.9, pp.187-198, 2004.

Induction machine fault diagnosis using the rotor magnetic field space vector orientation

Behrooz Mirafzal, and Nabeel A.O. Demerdash, IEEE Transactions on Industry Applications, vol.40, pp.534-542, March/April 2004.