NDLI: Evaluation of photovoltaic system power rating methods for a Cadmium Telluride array

Content Provider	IEEE Xplore Digital Library
Author	Nelson, L. Hansen, C.
Copyright Year	2011
Description	Author affiliation: First Solar, Oakland, California, USA (Nelson, L.) \|\| Sandia National Laboratories, Albuquerque, New Mexico, USA (Hansen, C.)
Abstract	A variety of metrics are commonly used to assess whether or not a photovoltaic (“PV”) system is operating as expected, but to date no standard metric has been accepted. Three commonly used metrics for assessing PV system power performance are the Power Performance Index (“PPI”), PVUSA rating as contemplated in ASTM WK22009 (“ASTM”), and Performance Energy Ratio (“PER”). This paper evaluates the suitability of each of the three metrics for use with large Cadmium Telluride (CdTe) arrays. Of particular interest is the uncertainty and stability of each result and relative differences between their magnitudes. Two different approaches for propagating measurement uncertainty to final metric uncertainty are discussed: (1) analytical and, (2) bootstrapping (similar to a Monte Carlo method). Additionally, best practices to achieve low uncertainty and high stability of a metric are addressed including choice of regression method, reference conditions and filtering range. Iteratively reweighted least squares regression methods were found to improve the stability of metrics in cloudy climates relative to ordinary least squares methods. Choosing irradiance filtering ranges that are sufficiently large and asymmetrical about the chosen reference condition was found to bias the metrics on the order of 0.6%. Final PPI uncertainty was found to be most sensitive to irradiance and power measurement errors and ranged from +/− 3% to +/− 8% for typical ranges of sensor accuracies.
Starting Page	002316
Ending Page	002321
File Size	1880589
Page Count	6
File Format	PDF
ISBN	9781424499663
ISSN	01608371
e-ISBN	9781424499656
DOI	10.1109/PVSC.2011.6186417
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Uncertainty Temperature measurement Power measurement Meteorology Measurement uncertainty Clouds
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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EVALUATION OF PHOTOVOLTAIC SYSTEM POWER RATING METHODS FOR A CADMIUM TELLURIDE ARRAY.

Evaluation of photovoltaic system power rating methods for a cadmium telluride array.

Changes in cadmium telluride photovoltaic system performance due to spectrum

Performance evaluation standards for photovoltaic modules and systems

Comparison of pyranometers vs. PV reference cells for evaluation of PV array performance

Effect of microstructure on the performance of stressed cadmium telluride photovoltaic (PV) devices

Photovoltaic module power rating per IEC 61853–1: A study under natural sunlight

Physical and chemical pathways for economic recycling of cadmium telluride thin-film photovoltaic modules

Changes in Cadmium Telluride Photovoltaic System Performance due to Spectrum

Evaluation of photovoltaic system power rating methods for a Cadmium Telluride array

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EVALUATION OF PHOTOVOLTAIC SYSTEM POWER RATING METHODS FOR A CADMIUM TELLURIDE ARRAY.

Evaluation of photovoltaic system power rating methods for a cadmium telluride array.

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Performance evaluation standards for photovoltaic modules and systems

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