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Reliable Electricity – Monitoring and Controls for a Stand-Alone Hybrid Solar Electric Power System. Pritpal Singh Professor and Chairman ECE Dept., Villanova University and Percy “Butch” Shadwell Head of Reliable Electricity Working Group, IEEE Humanitarian Technology Challenge.
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Reliable Electricity – Monitoring and Controls for a Stand-Alone Hybrid Solar Electric Power System 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
Team • IEEE Percy (“Butch”) Shadwell Richard Baseil SyedJafri • 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
Scope Definition 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 Presentation to IEEE PES July 27, 2010
Design Considerations • Terminations • Cable Ampacity • Insulation Type • Module Connectors • Module Connection Access • Splices • Conductor Color Coding 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 Presentation to IEEE PES July 27, 2010
Design Considerations …. cont’d • Disconnecting means • Panelboards and junction boxes • GFCIs and Switches • System Labeling 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 Presentation to IEEE PES July 27, 2010
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
Project Design Presentation to IEEE PES July 27, 2010
System Block Diagram Presentation to IEEE PES July 27, 2010
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
Controller design Presentation to IEEE PES July 27, 2010
Circuit design (sample) Circuit protection Load disconnect device Current sensor Connector placement sensor/Fault LED driver Presentation to IEEE PES July 27, 2010
Controller Printed Circuit Board Solder Side Component side Presentation to IEEE PES July 27, 2010
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
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 1st generation systems to test site and monitor performance Presentation to IEEE PES July 27, 2010
