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

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

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.

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

Series Transformer Diagram

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

Budget

Time Schedule

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