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2.1 Codes, Standards, and Certification Under this task, we provide leadership and support in creating and implementing domestic and international certification, codes, and standards for high-quality, safe, cost-effective PV systems applications. SNL, in close collaboration with Southwest Technology Development Institute (SWTDI), leads an industry forum of up to 90 members of the PV industry, utilities, academia, and government agencies to review the existing electrical codes for installation requirements, and proposes improvements and changes for the next code cycle. Certification, to improve the likelihood of safe and properly designed PV installations has been improved through establishment of NABCEP , and certification of components is addressed through the Certification Test Protocol for Inverters. Additional subcontract support for codes, standards, and certification is shown in Section 6 below. 3. Results and Accomplishments Highlights of results and accomplishments in the three tasks of this project include the following. 3.1 PV System Performance and Standards • 24 performance reports were generated for the PV systems monitored at the OTF. These reports were archived and circulated internally at NREL and distributed to the respective module manufacturers (milestone completed). • Formal designs were made for two new grid- tied PV systems planned for installation in the OTF array; these will feature SunPower high- efficiency c-Si modules and Shell Solar’s new CIGSS modules. (Planning completed; one system installed before the end of FY 2005.) • Improvements to the PVWATTS software were completed. The PV system specification size was changed from an AC power rating to a nameplate DC power rating; an input for an overall DC-to-AC derate factor was added for calculating a reference AC power rating, and residential electric rates were updated with the latest available data (milestone completed). • The Siemens (now Shell) Solar CIGSS array was taken down for performance measurements and reassembled. Results were discussed with Shell Solar. As a result of discussions with Shell Solar, this array will be replaced with a new system using the latest 80-W modules. Photovoltaic R&D Technology Development • Results of collaborations with Arizona Public Service and PowerLight Corporation on systems data analysis were reported at the 31st IEEE PV Specialists Conference (milestone completed early). 3.2 Solar Radiometry and Metrology • A summary report of National Institute of Standards and Technology (NIST) traceable/ ISO17025-compliant optical calibrations of NREL and PV industry radiometers and task activities was published as an NREL technical report (milestone 3/05). A second report is in publication (milestone 9/05). • Completed the technical and logistical preparations for the WMO International Pyrheliometer Intercomparison set for October 2005 (milestone 8/05). • After developing specifications, in concert with the Measurements and Characterization task, a purchase order is in place for a new spectroradiometer for the PV Reference Cell Calibration procedures (milestone 8/05). • Completed redesign of the Pulse Spectral Analysis System, reducing the measurement time for pulse solar simulator classification from 1–2 hours to 15 minutes. • Performed 15 characterizations of NREL and industry flash solar simulators on request. • Implemented an automated system for collecting, filtering, and reporting broadband calibration; a process that formerly required 1- 2 weeks of manual data analysis now produces results 2–4 hours after completion. New low-noise custom data acquisition system reduces “zero-offset” error signals by a factor of 9. Calibration results are automatically printed and transmitted to a database for archiving and user access. Evaluated indoor calibration system for pyranometers. 3.3 Codes, Standards, and Certification • Completed and published the 2005 NEC with Industry Forum consensus changes simplifying installs, allowing ungrounded PV circuits to reduce costs and improve system performance. Proposed 42 changes for the 2008 NEC through the SNL/SWTDI Industry Forum. • Acceptance and adoption of IEEE 1547.1 for interconnecting distributed generation to the utility. • Completion of technical input revisions of UL 1741 for listing inverters for PV and other 74PDF Image | DOE Solar Energy Technologies Program
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