Transcript Flywheel - uidaho.edu

12/06/2005
HydroFly
Flywheel
Gavin Abo
Nate Stout
Nathan Thomas
Hydrofly
• Two Teams
– Flywheel
– Fuel Cell
• Adam Lint
• Chris Cockrell
• Daniel Hubbard
Sponsors & Mentors
•
•
•
•
•
Brian Johnson
Herb Hess
Satish Samineni
Greg Klemesrud
John Jacksha
Presentation Outline
I. Introduction
II. Objectives
III. Specifications
IV. Design Functionality
V. Test Plan
VI. Schedule
VII. Budget
VIII. Future Work
IX. Questions
I. Introduction
Why is the project being done?
- To correct short voltage sags (Less than 1.5 seconds)
to maintain a stable voltage to critical loads.
II. Primary Objective
• Interface a flywheel to the AMPS with the
ability to correct for voltage sags occurring
on the AMPS.
– Implement the design by Satish Samineni
Secondary Objectives
•
•
•
•
•
•
Spin a flywheel
Communicate between converters
Operate each converter with its own PWM
Provide power to AMPS
Make the system safe
Operation Manual
III. Specifications
The AMPS
Three-Phase Series Transformer
DC Bus Voltage
DC power supply max. ripple
DC Bus Capacitance
Flywheel Moment of Inertia
Maximum Flywheel Stored Energy
Induction Machine Ratings
SVPWM Switching Frequency
SPWM Switching Frequency
Maximum Sag Correction Duration
Maximum Magnitude of Sag
Correction
Sag Correction Response Time
Magnitude Sag Correction Tolerance
2 Tier Converters
DSP Program Language
Sample Rate for Voltage Correction
Flywheel Speed Sensor
3 Phase, 208 V, 60 Hz, 5 kVA
7:10 turns ratio, 34.8 kVA
450 V max
50V DC
2 x 250V 1000 μF (grounded between
the 2)
5.406 kg-m2
91.305 kJ
208 V, 32.6 A, 60 Hz, 10 hp, 4 pole
1 kHz
10.8 kHz
1.5 s
37% (or 63% of rated) @ 0.95 pu
Within 2 cycles
Within 0.95 pu  0.05 pu of rated
6 IGBTs 75A, JTAG (software not
included), etc.
C with inline ASM from TI
20k samples per cycle
Position Encoder
Goals that have not been met
• Fully Operational STPWM Code
– Setup voltage LEMs and acquire voltages
• 3 voltages LEMs not yet received, but on the way
• Converter can acquire two voltages, but must scale by
calculation of transformer ratio.
– Implement sine wave lookup table
• Fully Operational SVPWM Code
– Setup voltage LEMs and acquire voltages
– Setup position encoder and acquire theta
• Setup communication between boards
– Sag status
– Tsag
• Need to determine best pin, currently would lose temp sensor
for board protection.
• Starting induction motor
• Power the DC bus capacitors
IV. Design Functionality
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•
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Block Diagram
Circuit Schematic
Sub Circuit Schematics
Organizational Chart
Code Flow Diagram
Programming
Documentation
Safety Features
Block Diagram
Circuit Schematic
Series Transformer Diagram
Source
B Phase
+ Vinjected -
+ Vinjected -
Flywheel Energy Storage System
C Phase
Load
A Phase
+ Vinjected -
In phase
x    2sin   y   sin 
Out of phase
z   x    y  
a    x   75deg
   y 
4
4
3
3
2
2
x(  )
1
x(   75 deg)
1
y ( )
0
y ( )
0
z( )
a(  )
1
1
2
2
3
3
4
10
5
0

5
10
4
10
5
0

5
10
DC link charging power supply
We used simple rectifier
circuits to generate
the DC voltage
Organizational Chart
Interface a flywheel to AMPS to
correct for voltage sags on the
system
Program the
switching
times
calculation
Spin a flywheel
Provide power
to AMPS
Operate a
space vector
PWM scheme
Operate a
sine–triangle
PWM scheme
Program
matrix math
functions
Program a
Phase locked
loop
Communicate
between
converters
Program the
triangle wave
Sag Status
Program the
sine wave
look up table
Code Flow Diagram
In order to help organize the code,
we produced the following...
Start
Interrupts
Space Vector spin flywheel
up to minimum speed
Has minimum
speed been
reached?
Slow the motor
Determine magnitude
of the sag
Measurement
Error
Flywheel below
minimum speed
Less than
0.63 p.u.?
Check for sags
Stop All
PLL Start
Sag
Detected?
Sine Triangle PWM
Sag
Persisting?
DC link lost its
voltage level
The Programming
• All code is mathematically verified
and set up to be interfaced to the
DSP
• Testing still needs to be done.
Documentation
• Not Completed
– Final Report
– Operations
Manual
• Completed
–
–
–
–
Test plan
Poster
Life Cycle Report
Product
Reliability Report
Safety Features
•
•
•
•
Plexiglas around all four sides of the cart
Capacitor interface with banana jack leads
Capacitor shorting bars
Power strip as power connection
V. Test Plan Sample
Test FVSCS specifications
 Turn on the power strip.
 Verify that the DC bus has 450 volts on it.
 Verify that the flywheels is spinning at 1755 RPM with a strobe.
 Connect an oscilloscope to the sag bit line of the boards.
 Verify that the sag bit is in the low (0V) state.
 Initiate the 3 phase symmetrical fault on the line.
 Verify that the sag bit goes high (3.3V) state.
 Check SEL relay data to verify that the fault was corrected.
-  For the full duration of the sag.
-  To within 0.95  0.05 p.u. of nominal voltage.
-  Correction occurring within two cycles
Record
VI. Schedule
• This Week Final Demonstration
– To be scheduled W, Th, or Fri
• 12/12/2005 Final Report II Due
– Includes Documentation
VII. Budget
Quantity
Item
2
1
1
DC/AC Converter
DSP Software
XDS510PP-Plus Parallel
Port Emulator
1000 F Capacitors 250 V
Craftsman Utility Cart
(Mfr. model #59345)
3-Phase Transformer
120V 20A Diodes
Wall Transformer
48 VDC 500 mA
Plexiglas 4’ x 8’ Sheet
+ cutting tool
Voltage Transducer
Current Sensor
Time Delay Relay
8 pin octal relay base
200 V 20A Diodes
Design Poster/Report
Binding
2
1
1
10
1
1
3
6
2
2
10
1
Company
Tier Electronics
Texas Instruments
Spectrum Digital
Unit SubTotal with
Price
Freight
$1,700
$3,428.04
$495
Donated
$974.25
Donated
Futurlec
Sears (Lewiston, ID)
$2.5
$62.99
$8
$62.99
UI G10 Lab
Digi-Key
Jameco
-$1.138
$10.95
Salvaged
$18.59
$17.44
Moscow Building
$57.31
Supply
LEM USA
$37
LEM USA
$21
Surplus Sales
$49
FM Stores
$4.66
Digi-Key
$1.00
UI Commons Copy
$66
Center
Total Expenditures
Total Value of donated Items
Proposed Budget
Remaining Budget
$57.31
Donated
Donated
$104
$9.32
$23.01
$66
$3,794.70
$1706.25
$4,825.00
$1,030.30
VIII. Future Work
• Unbalanced sags
• Better DC link charging supply
• Interface an visual human machine interface
(HMI)
– Error reporting
– Event recording
IX. Questions
http://www.ece.uidaho.edu/hydrofly/website