1. Gavin Abo Nate Stout Nathan Thomas
HydroFly Flywheel
Gavin Abo
Nate Stout
Nathan Thomas

2. Background The flywheel is a mechanical energy storage device
Once up to speed very little energy is required to maintain desired speed
Small draw on AMPS

3. Background Continued
Flywheels were used during the industrial revolution to smooth out torque pulses in mechanical systems
We will use it in a similar fashion to smooth out voltage sags on the AMPS

4. Voltage Sags Drop in RMS voltage
Typically last from 1/2 cycle to a minute
Caused by actions on the system that have large current draws
Motors starting
Transformers energizing
Pulsed load switching
Electrical faults

5. Why Sags Are Bad Voltage sags have adverse affects on sensitive loads
Sags can cause loads to shutdown
Loss of use
Loss of Data
Loss of production time

6. Navy Survivability of Naval ships in battle situations
In battle situations voltage sags can occur due to various reasons, causing critical systems to go offline
Flywheel voltage sag detection devices could be used to help protect these critical systems

7. Education
The flywheel energy storage system may be implemented into future power classes at the University of Idaho for educational purposes
Power quality classes
System protection classes
Transient analysis classes

8. Main Objective Implement the design by Satish Samineni
Be able to correct for up to 33% voltage sags on AMPS

9. We will focus on We will not do: Induction motor controller
Programming of the DC link
Synchronizing to AMPS
Protection circuitry
We will not do:
Design of DC link
Design of Induction motor controller

10. Block Diagram

11. Switching

12. PWM A triangle wave reference is applied to a signal Compared
Triangle high: logic 0
Signal high: logic 1
Applied to all 3 phases

13. Block Diagram

14. Series Transformer Diagram

15. Synchronization & Protection
Use a phase lock loop to monitor and regulate phase
Add any additional protection needed

16. In phase Out of phase

17. Budget

18. Time Schedule

19. Questions?