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Electrical Engineering



Liyan Qu
Assistant Professor


Contact:

Liyan Qu
Education
  • Ph.D., Electrical Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 2007
  • M.S., Electrical Engineering, Zhejiang University, Hangzhou, China, 2002
  • B.S., Electrical Engineering, Zhejiang University, Hangzhou, China, 1999
Research Interests
  • Modeling techniques to facilitate the analysis and design of complex, high-performance electric energy systems
  • Numerical analysis and computer aided design for electric machinery and power electronic devices and circuits
  • Electric machines and drives
  • Magnetic devices and materials
  • Power management for electric energy systems, e.g., battery-powered systems
  • Renewable energy systems, e.g., wind, solar
  • Wireless power transmission
  • Energy harvesting

REFEREED JOURNAL PAPERS
  • T. Kim, W. Qiao, and L. Qu, “Power Electronics-Enabled Self-X Multicell Batteries: A Design toward Smart Batteries,” IEEE Transactions on Power Electronics, vol. 27, no. 11, pp. 4723-4733, Nov. 2012.
  • L. Qu and W. Qiao, “Constant Power Control of DFIG Wind Turbines with Supercapacitor Energy Storage,” IEEE Transactions on Industry Applications, vol. 47, no. 1, pp. 359-367, Jan.-Feb. 2011.
  • W. Qiao, L. Qu, and R. G. Harley, “Control of IPM Synchronous Generator for Maximum Wind Power Generation Considering Magnetic Saturation,” IEEE Transactions on Industry Applications, vol. 45, no. 3, pp. 1095-1105, May-June 2009.
  • L. Qu and P. L. Chapman, “Extraction of Low-Order Nonlinear Inductor Models from a High-order Physics-based Representation,” IEEE Transactions on Power Electronics, vol. 21, no.3, pp. 813-817, May 2006.
  • L. Qu, J. Wu, and Y. Chen, “Automatic Generation and Fast Implementation of Finite Element Mesh,” Electric Machines and Control, vol. 6, no.1, pp. 34-38, Mar. 2002.
  • L. Qu, J. Wu, and Y. Chen, “Object-oriented Visualization CAD System for DC Motor,” Small & Special Electrical Machines, vol. 28, no. 6, pp. 40-42, 2000.
REFEREED CONFERENCE PAPERS
  1. J. Zeng, W. Qiao, and L. Qu, “A Single-Switch Isolated DC-DC Converter for Photovoltaic Systems,” in Proc. IEEE Energy Conversion Congress and Exposition, pp. 3446-3452, Sept. 15-20, 2012.
  2. J. Zeng, W. Qiao, and L. Qu, “An Isolated Multiport DC-DC Converter for Simultaneous Power Management of Multiple Renewable Energy Sources,” in Proc. IEEE Energy Conversion Congress and Exposition, pp. 3741-3748, Sept. 15-20, 2012.
  3. T. Kim, W. Qiao, and L. Qu, “A Series-Connected Self-Reconfigurable Multicell Battery Capable of Safe and Effective Charging/Discharging and Balancing Operations,” in Proc. 2012 Applied Power Electronics Conference and Exposition, pp.2259-2264, Feb. 5-9, 2012.
  4. T. Kim, W. Qiao, and L. Qu, “Self-Reconfigurable Multicell Battery,” in Proc. IEEE Energy Conversion Congress and Exposition, pp. 3549-3555, Sept. 17-22, 2011.
  5. T. Kim, W. Qiao, and L. Qu, “Series-Connected Self-Reconfigurable Multicell Battery,” in Proc. 26th Applied Power Electronics Conference and Exposition, Fort Worth, TX, USA, pp. 1382-1387, Mar. 6-11, 2011.
  6. C. Lohmeier, J. Zeng, W. Qiao, L. Qu, and J. Hudgins, “A Current-Sensorless MPPT Quasi-Double-Boost Converter for PV Systems,” in Proc. IEEE Energy Conversion Congress and Exposition, pp. 1069-1075, Sept. 17-22, 2011.
  7. T. Kim, W. Qiao, and L. Qu, “Series-Connected Reconfigurable Multicell Battery: A Novel Design Towards Smart Batteries,” in Proc. IEEE Energy Conversion Congress and Exposition 2010, Atlanta, GA, USA, pp. 4257-4263, Sept. 12-16, 2010.
  8. L. Qu and W. Qiao, “Constant Power Control and Fault-Ride-Through Enhancement of DFIG Wind Turbines with Energy Storage,” in Proc. IEEE Industry Applications Society 44th Annual Meeting, pp. 1-8, Oct. 4-8, 2009.
  9. W. Qiao, X. Gong, and L. Qu, “Output Maximization Control for DFIG Wind Turbines without Using Wind and Shaft Speed Measurements,” in Proc. IEEE Energy Conversion Congress and Exposition, pp. 404-410, Sept. 20-24, 2009.
  10. L. Qu and P. L. Chapman, “Extraction of Dynamic Low-Order Models for Multiwinding Magnetic Devices Based on Finite Element Analysis,” in Proc. 39th IEEE Power Electronics Specialists Conference, pp. 4611-4616, June 15-19, 2008.
  11. W. Qiao, L. Qu, and R. G. Harley, “Control of IPM Synchronous Generator for Maximum Wind Power Generation Considering Magnetic Saturation,” in Proc. IEEE Industry Applications Society 42nd Annual Meeting, pp. 1265-1272, Sept. 23-27, 2007. (IAS Industrial Automation and Control Committee Second Prize Paper Award)
  12. L. Qu and P. L. Chapman, “Extraction of Dynamic, Low-Order Models for Magnetic Devices Based on Finite Element Analysis with Hysteresis,” in Proc. 38th IEEE Power Electronics Specialists Conference, pp. 2082-2088, June 17-21, 2007.
  13. A. Davoudi, L. Qu and P. L. Chapman, “Summary of Recent Work on Reduction Techniques Applied to Electromechanical Modeling,” in Proc. IEEE Electric Ship Technologies Symposium, pp. 363-370, May 21-23, 2007.
  14. L. Qu and P. L. Chapman, “Toward a System for Automatic Extraction of Low-Order Models for Magnetic Devices,” in Proc. IEEE Workshop on Computers in Power Electronics, July 16-19, 2006.
  15. L. Qu and P. L. Chapman, “Extraction of Dynamic Low-Order Nonlinear Inductor Models Based-on Steady State Solutions,” in Proc. 37th IEEE Power Electronics Specialists Conference, pp. 608-616, June 18-22, 2006.
  16. L. Qu and P. L. Chapman, “A Trajectory Piecewise-Linear Approach to Model Order Reduction for Nonlinear Stationary Magnetic Devices,” in Proc. IEEE Workshop on Computers in Power Electronics, pp. 15-19, Aug. 15-18, 2004.
TECHNICAL REPORT
  • L. Qu, Manoel Soares, and Zheng Zhang, “Thermal and Electrical Modeling of a PMSM,” Advanced Electronics Applications, Research and Engineering Center, Whirlpool Corporation, Jan. 2007.
COURSES TAUGHT
  • ELEC 438/838 -- Introduction to Electric Power Engineering
  • ELEC 498/898 -- Electric Machines
  • ELEC 428/828 -- Power Electronics
  • ELEC 428L/828L -- Power Electronics Laboratory
OPEN POSITIONS

1. I am seeking self-motivated students who are interested in pursuing a Ph.D. degree in the area of electric power and energy systems. If you want to apply for a Ph.D. position, email me a copy of your resume including education background, a list of in-major courses and grades, overall GPA, relevant research/working experience, relevant publications, GRE score, and TOEFL score (for international applicants). In your email, please use “Graduate Applicant – Your Name” as the subject.To be considered for admission by the Department of Electrical Engineering, you must send a formal and complete application to UNL Office of Graduate Studies. Please follow the guidelines on http://engineering.unl.edu/academicunits/electricalengineering/ graduate/ to submit your application.

2. I am also seeking self-motivated post-doctoral researchers in electric power and energy systems. Stipend may vary depending on qualification. If you are interested in a post-doctoral position, please email me a copy of your resume including education background, relevant research/working experience, relevant publications, etc. In your email, please use “Postdoc Applicant - Your Name” as the subject. For all positions, previous experience in one or more of the following areas is highly desired:

  • Modeling techniques to facilitate the analysis and design of complex, high-performance electric energy systems
  • Numerical analysis and computer aided design for electric machinery and power electronic devices and circuits
  • Electric machines and drives
  • Magnetic devices and materials
  • Power management for electric energy systems (e.g., battery-powered systems)
  • Renewable energy systems (e.g., wind, solar)
  • Wireless power transmission
  • Energy harvesting
  • Thermal management