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ECE 364 - Power Electronics

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									      The Grainger Center for Electric
      Machinery and Electromechanics
             update, May 2006


            P. Krein, P. Chapman
   Grainger Center for Electric Machinery
            and Electromechanics
Dept. of Electrical and Computer Engineering
 University of Illinois at Urbana-Champaign
                                     Introduction
 • The Grainger Center for Electric Machinery
   and Electromechanics (CEME) a large
   endowed academic program.
 • Funds leverage industry and government
   support.
 • About 25 graduate students and many
   additional undergraduates.
 • Research on machines, drives and drive
   controls, and advanced energy processing.


Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     2
                                        Highlights
 • Emphasis this year: enhance national
   collaboration activities.
 • A 21st century design initiative with our
   collaborating universities in preparation.
 • Expand future-oriented energy conversion
   efforts – disruptive energy innovations and
   fundamental advances.




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     3
    21st Century Electric Machines Initiative
 • Worldwide, 2/3 of electricity is consumed by
   electric machines.
 • Nearly all were designed two generations ago
       – Before power electronics
       – Before good permanent magnets
       – Before computer-based
         engineering tools.
 • The design needs and
   applications have changed.


Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     4
    21st Century Electric Machines Initiative
 • A machine today is not just steel and copper.
 • Add to the mix of choices:
       – Silicon devices for switching and
         control.
       – Advanced steels.
       – Exotic magnetic materials.
       – Superconductors.
       – Nanoengineered materials.
       – New thermal technologies.



Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     5
    21st Century Electric Machines Initiative
 • We are collaborating with Purdue and
   Georgia Tech on a major research initiative to
   create a 21st century design framework for
   electric machines and electromechanics.
 • This combines electrical, mechanical, and
   materials engineering to create user tools.
 • Educational aspects:
       – New “clean slate” textbook.
       – Short courses and seminars.
       – Lab methods.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     6
    21st Century Electric Machines Initiative
 • Project examples:
       – Tim O’Connell, computer methods for exact field
         analysis
       – Marco Amrhein, design for high efficiency.
       – Penglin Niu,
         design
         considerations
         for human
         power




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     7
               Disruptive Energy Innovations
 • One-stage grid inverter for alternative energy.
 • Disruption: direct “plug and play” processing.
 • Disruption: technology that scales down to small
   modules for broad use.
 • Today, solar power costs are split almost equally
   between semiconductor cells, power conversion,
   and mounting and installation.
 • Most outside research emphasizes
   semiconductor advances instead of a complete
   energy system.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     8
                         Collaborative Network
 •   University of California (Berkeley)
 •   Georgia Tech
 •   Ohio State
 •   Oregon State
 •   Purdue
 •   University of Wisconsin (Madison)




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     9
                                          Themes
 • Best use of technology and hardware
 • Best performance for power conversion
 • Best match between power electronic circuits
   and controls and the applications

 • Nonlinear controls for both analog and digital
   implementations of motor controls and power
   electronics
 • System-level design and performance
 • 3rd generation digital controls

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                    10
                          Fundamental Studies
• Mathematical justification and extension of
  motor control methods.
• Harmonic elimination approaches
     – Identified a more complete (infinite) range of
       solutions
     – Implemented in near-real-time algorithms
• Hybrid and electric
  vehicle systems
• Digital implementations
  of nonlinear controls

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                    11
          Boost Converter with “Infinite Bandwidth”
  • Line step disturbance.
  • The digital control eliminates the transient.

2.5
                                                                       i L (t)
  2



1.5                                  v out (t)
                                     expanded
  1



0.5
      0       50       100        150       200       250        300             350   400      450        500



 Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                      12
                           Research Equipment
• Power inverters for motor control testing.
• Circuit design tools.




• Test beds for power
  converters.




 Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                     13
                         More Sample Projects
 • Small-scale converters for micro
   fuel cells.
 • The power buffer, a method to
   use power electronics in loads
   to mitigate power system dynamics.
 • Drives for 42 V automotive applications.
 • Analysis and enhancement of direct torque
   control methods.
 • Advanced digital methods for motor control.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
                                                                                                    14
                             Area Infrastructure
 • Rotating and linear machines
 • Unique instructional lab

                                                                   stator              fan                   GPD 205
                                                                   current                   stator coils


                                                                   al rotor                                 GND




                                                                        track                           stator
                                                                                                        laminations



                                                             About 40 students per year
                                                             enroll in power electronics.
                                                             Also about 40 students per
                                                                  year in machines.
Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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