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
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HydroFly: Flywheel Background - College of Engineering Review/Design... · 1 HydroFly: Flywheel Gavin Abo Nate Stout Nathan Thomas Background •The flywheel is a mechanical energy
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HydroFly: Flywheel
Gavin AboNate StoutNathan 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
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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
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• We will focus on– 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
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Block Diagram Series Transformer Diagram
Flywheel energy
A
CB
storage system
Synchronization & Protection• Use a phase lock loop to monitor and regulate phase• Add any additional protection needed xθ( ) 2sinθ( ):= yθ( ) sinθ( ):= zθ( ) xθ( ) yθ( )+:=
10 5 0 5 104
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2
1
0
1
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xθ( )
yθ( )
zθ( )
θ
In phase Out of phase
a θ( ) xθ 75deg⋅+( ) y θ( )+:=
10 5 0 5 104
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2
1
0
1
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xθ 75deg⋅+( )
y θ( )
a θ( )
θ θ, θ,
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BudgetFlywheel Budget
Item PriceInduction Motor Controller $350DC link $4,0003-phase transformer (500VA) $125Design Poster/Report Binding* $15Project Display Costs* $35Miscellaneous $300