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

2. 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

3. 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

4. Main Objective Implement the design by Satish Samineni
Interface a flywheel to the AMPS with the ability to correct for voltage sags occurring on the AMPS.

5. 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

6. Block Diagram

7. Switching

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

9. Series Transformer Diagram

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

11. Budget

12. Time Schedule

13. Questions?