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

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

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

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

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

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

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

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

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

Block Diagram

Switching

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

Block Diagram

Series Transformer Diagram

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

In phase Out of phase

Budget

Time Schedule

Questions? www.ece.uidaho.edu/hydrofly/website