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. Presentation to IEEE PES July 27, 2010 Scope Definition Power DistributionIntelligence Circuit ProtectionHMI Signal MonitoringCode Compliance ConnectorsDocumentation Expandability Modularity Troubleshooting
Innovation in the service of humanity. Presentation to IEEE PES July 27, 2010 Applicable Code NEC 2008 Article 690 for PV installations Article 705 for Interconnected Sources Article 720 for Circuits < 50V UL Standard 1703
Innovation in the service of humanity. Presentation to IEEE PES July 27, 2010 Design Considerations Terminations Cable Ampacity Insulation Type Module Connectors Module Connection Access Splices Conductor Color Coding
Innovation in the service of humanity. Presentation to IEEE PES July 27, 2010 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
Innovation in the service of humanity. Presentation to IEEE PES July 27, 2010 Design Considerations …. cont’d Disconnecting means Panelboards and junction boxes GFCIs and Switches System Labeling
Innovation in the service of humanity. Presentation to IEEE PES July 27, 2010 Associated Hazards A single 6V, 220 Ah storage battery can discharge about 8000A into a terminal- terminal short circuit 12V to 600V system present shock hazard Listed equipment – UL, CSA, ETL
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 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 Current sensor Connector placement sensor/Fault LED driver Load disconnect device Presentation to IEEE PES July 27, 2010
Innovation in the service of humanity. Controller Printed Circuit Board Component side Solder 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 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 1 st generation systems to test site and monitor performance Presentation to IEEE PES July 27, 2010