NDLI: A Newton-Raphson method approach to adjusting multi-source solar simulators

Content Provider	IEEE Xplore Digital Library
Author	Snyder, D.B. Wolford, D.A.
Copyright Year	2012
Description	Author affiliation: NASA Glenn Research Center, Cleveland, OH, USA (Snyder, D.B.; Wolford, D.A.)
Abstract	NASA Glenn Research Center has been using an inhouse designed X25 based multi-source solar simulator since 2003. The simulator is set up for triple junction solar cells prior to measurements by adjusting the three sources to produce the correct short circuit current, Isc, in each of three AM0 calibrated sub-cells. The past practice has been to adjust one source on one sub-cell at a time, iterating until all the sub-cells have the calibrated Isc. The new approach is to create a matrix of measured Isc for small source changes on each sub-cell. A matrix, A, is produced. This is normalized to unit changes in the sources so that A×Δs= Δi. This matrix can now be inverted and used with the known Isc differences from the AM0 calibrated values to indicate changes in the source settings, Δs= $A^{−1}×Δisc$ This approach is still an iterative one, but all sources are changed during each iteration step. It typically takes four to six steps to converge on the calibrated Isc values. Even though the source lamps may degrade over time, the initial matrix evaluation is not performed each time, since measurement matrix needs to be only approximate. Because an iterative approach is used the method will still continue to be valid. This method may become more important as state-of-the-art solar cell junction responses overlap the sources of the simulator. Also, as the number of cell junctions and sources increase, this method should remain applicable.
Starting Page	001318
Ending Page	001320
File Size	1259535
Page Count	3
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317843
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current measurement Photovoltaic cells Junctions NASA Newton method Short circuit currents Lighting space technology aerospace testing photovoltaic cells solar power generation solar simulator solar cell calibration space power
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in