A Roadmap to the Digital Power Lab'

1
A Roadmap to theDigital Power Lab.  
VTB Conference 2004 Sep. 15, 2004

• Antonello Monti
• Dept. of Electrical Engineering
• University of South Carolina
• Columbia, SC 29208

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Summary

• The DPL concept
• VTB and Real Time
• VTB and external interfaces
• Overview of the on-going effort
• The 2005 ESRDC Control Demonstration

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Challenges on the DPL
Real World
HF Power Interface
Real-Time Simulation VTB-RT
HF Signal Interface
DPL
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Simulation
Real-Time Simulation VTB-RT
Multiprocessing VTB-RT on VXI
VTB-RT on DSP
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VTB-RT on VXI

• Why Real-Time Distributed Simulation
• More flexible.
• More effective.
• Able to deal with complex and dynamic models.
• Available commercial tools
• Expensive.
• Complicated proprietary hardware.

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6
VTB-RT

• RTVTB is an adaptation of the Linux version of
  VTB.
• RTVTB is inexpensive
• Free OS - Linux
• Open-source software RTAI
• RTVTB is a hard real-time simulation environment.
• RTVTB shares its architecture with VTB windows.

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Distributed Simulation
Complex System
Subsystem 1
Subsystem 2
Subsystems 3 n
RTClock
RT VTB
RT VTB
RTClock
PC 2
PC 1
RT VTB
RTClock
PC 3 n
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8
The real HW and .the real people
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Opportunities
VXI bus
COTS solution
PC
PC
PC
PC
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VTB-RT on DSP

• Why DSP?
• 1.High-performance processor
• 2. Multi-function integrated I/Os
• 3. Enable scalable multiprocessing system

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Software Architecture

• Schematic Editor
• Solver
• Graphic Tools

ADSP TS101 TS
VTB Solver
.vts file
Under Microsoft Windows
VTB Schematic Editor
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DSP version

• Hardware Feature
• 1. 250MHz processor
• 2. 6M bits of Internal Memory
• 3. 32MB PC2100 External SDRAM
• Binary code can be downloaded to ROM or FLASH
  memory.
• Support boot loadable and non-boot loadable PROM
  image file

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DSP Solver

• Example System
• Timestep 0.0001
• Tolerance 7e-006
• Simulation time1s
• R1R21000?
• L1mH
• C1mF

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DSP Solver

• Time DSP Windows
• 0.0081 3.99581 3.99581
• 0.0082 4.01588 4.01588
• 0.0083 4.03555 4.03555
• 0.0084 4.05483 4.05483
• 0.0085 4.07373 4.07373
• 0.0086 4.09224 4.09224
• 0.0087 4.11039 4.11039
• 0.0088 4.12817 4.12817
• 0.0089 4.1456 4.1456
• 0.009 4.16267 4.16267
• 0.0091 4.17941 4.17941
• 0.0092 4.19581 4.19581
• 0.0093 4.21189 4.21189

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Future Work

• Add more models into system
• Reconfigure the memory map
• Optimize code
• Parallel computing using two DSPs on the board
• I/O management

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Opportunities
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AlGaN/GaN MOSHFET Power Converter

• Benefits
• High Switching Speed
• High electron mobility
• High Saturation velocity
• 2-D electron gas at heterojunction
• Low Forward Voltage Drop
• Low specific on resistance
• High Reverse Breakdown Voltage
• High critical electric field

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AlGaN/GaN MOSHFET Power Converter

• Power Converter Schematic

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Structure of the proposed interface
Real-TimeVTB
Gate Signal Averaging Interface
DAQ
VTB EXTERNAL INTERFACEMODEL
Hardware Controller
Hardware Interface
Gate signals
12-bit parallel communication
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System example
iL

Block diagram d is the duty cycle of the PWM
signal
Buck Converter
R-L Load
VDC
-
d
VTB schematic
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Acquisition of the PWM input signal d (t)
Real input signal
Software-only approach _at_ 50 ms resolution
Custom hardware interface _at_ 0.5 ms resolution
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VTB simulation results
30
20
25 ms
25 ms
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Simulation with 0.5 ms time step
Simulation with 50 ms time step
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Current waveform of the HIL simulation
2.5 V
1.5 V
rescaled using a scaling factor of 1/10 due to
the voltage range limitation of the data
acquisition card
0.5 V
25ms
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2005 ESRDC Control Demonstration

• Show the progress of the consortium in the field
• Show how the different efforts can be integrated
  giving concreteness to the strength of the
  Consortium

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Demo Roadmap
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The Zero Power Demo
VTB-RT Switchboard
VTB-RT Critical Load
VTB-RT Sensitive Load