Transcript Reliable Electricity Challenge - Community Solutions Initiative

Innovation in the service of humanity.
Pritpal Singh
Professor and Chairman
ECE Dept., Villanova University
and Percy “Butch” Shadwell
Head of Reliable Electricity Working Group,
IEEE Humanitarian Technology Challenge
(with contributions from Syed Jafri)
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Team
• IEEE
Percy (“Butch”) Shadwell
Richard Baseil
Syed Jafri
• Villanova University
Neeta Khare (Postdoc)
Renee Daniel (Master’s candidate)
• L3 Communications and Drexel University
David Williams (Master’s candidate)
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Scope Definition
Power Distribution
Intelligence
Circuit Protection
HMI
Signal Monitoring
Code Compliance
Connectors
Documentation
Expandability
Modularity
Troubleshooting
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Applicable Code
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NEC 2008
Article 690 for PV installations
Article 705 for Interconnected Sources
Article 720 for Circuits < 50V
UL Standard 1703
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Design Considerations
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Terminations
Cable Ampacity
Insulation Type
Module Connectors
Module Connection Access
Splices
Conductor Color Coding
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Design Considerations …. cont’d
• Ground Fault
– Detection
– GF Current interruption
– Array disconnect/inverter shut down
– GF Indication
• Grounding & Grounded conductors
• Branch Circuit
• Point of connection
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Design Considerations …. cont’d
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Disconnecting means
Panelboards and junction boxes
GFCIs and Switches
System Labeling
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Associated Hazards
• A single 6V, 220 Ah storage battery can
discharge about 8000A into a terminalterminal short circuit
• 12V to 600V system present shock hazard
• Listed equipment – UL, CSA, ETL
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Project Specifications
• Design for a community center, medical clinic or
individual dwelling.
• Stand-Alone Hybrid Power System to provide power for
fans, lighting, water pumping, refrigeration, radio, and
cell phone charging.
• 24VDC bus selected to minimize wire size and cost.
• Initial design is over-instrumented to provide field study
feedback – later implementation designs will be simpler.
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Project Design
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
System Block Diagram
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
System Components
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2 series-connected 125Wp solar panels
2 series connected 75Ah SLA batteries
Sunsaver MPPT Charge Controller
Bicycle backup generator
PIC 24J Microprocessor
Current and voltage sensing circuits
Load disconnect circuit
Circuit protection design
Fault LEDs Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Controller design
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Circuit design (sample)
Circuit protection
Load disconnect device
Current sensor
Connector placement
sensor/Fault LED driver
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Controller Printed Circuit Board
Solder Side
Component side
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Project Status
• Circuit design….completet
• Printed circuit board fabrication…complete
• Solar panels, charge controller and battery
acquisition…complete
• Programming….almost complete
• Bill of Materials… almost complete
• Chassis design….in process
• Site selection….in process
• Testing….not yet started
Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity.
Next Steps
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Order components and populate boards
Finalize chassis design and build
Test control boards
Settle on test site
Assemble and test complete system in lab
Transfer prototype 1st generation systems
to test site and monitor performance
Presentation to IEEE PES July 27, 2010