AC Active Load Final Presentation

1. AC Active Load Final Presentation Presented by: Mark Fraysier Richard Jennings 11/28/2012

2. Recap: What is the AC Active Load? • Testing equipment device for three-phase devices • Analyzes how efficiently machines operate using desired, created load. • Done by manipulating the power triangle

3. How we left EE 480

4. Summer Contributions • Research of cost reduction • Communication between group members • Reassured what our efforts would be during the beginning of EE 481

5. The Beginning of EE 481

6. The Reaction • We met with Dr. Famouri • Dr. Famouri suggested us to get rid of all systems except • AC Switches • DC Chopper • Microprocessor • Drive Circuits • Zero Crossing Detector • Filters • This dramatically reduced the costs and complexity of the project

7. The New Parts List

8. Zero Detection Circuit

9. Drive Circuits

10. Bi-directional Converter

11. Input Filter

12. DC Chopper

13. Entire System Schematic

14. Software Design • (See Microsoft Word Document)

15. Construction Process • Printed Circuit Boards were removed from our design • This drastically increased the amount of labor to construct the hardware • Surfboards • Assembly

16. Design Achievements • We completed nearly all hardware construction of the system as designed • With + or – 10% tolerance • The seven drive circuits were tested and operated correctly • We ran out of time to do the software

17. Demonstration of AC Active Load • We will attempt to manually generate our own pulse width modulation using lab supplies • No microprocessor • No zero crossing circuit • No knobs

18. Software Simulation

19. Simulation Parameters • FSW=5 kHz • NOTE • The simulation was done for maximum load power with unity power factor

20. Simulation Results

21. Simulation Conclusions • From the graph we determine that this load would work well with the generator • However, the simulation does not include the effects of switching losses • We must build the hardware to demonstrate switching losses • Still, the simulation provides useful information about the system

22. Drive Circuits Test Results • The Drive Circuits functioned properly during independent testing. • However, the turn-on rate for the MOSFETs appears to be insufficient for proper operation at 10 kHz. • This may be remedied by adjusting component values in the Drive Circuits

23. Safety Precautions • An external housing would greatly improve the safety of the system. • Proper design of the system makes failure unlikely, however operator misuse could result in injury or death due to electrocution.

24. Reflections • Lack of proper communication with our mentor resulted in a lot of wasted time • Wasted time resulted in our failure to have software operational • We will test the system over the next several days using our own created PWM • We won’t know the final results of the entire system performance until then

25. Advice for Future AC Active Load Senior Design Endeavors • Have 4 group members • 2 Electrical Engineers • 1 Computer Engineer • 1 Computer Scientist • The computer engineer and computer scientist work on the software while the electrical engineers work on the hardware • Include the automatic feedback and include a simple user friendly GUI

26. Potential Development of Project • Incorporate externalized elements to create independently functional device • Meters • Display • Power supply • Power dump • Add canceled features back into the system • Computer interface • Battery back-up • Internal memory

27. Any Questions?