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Title: Real-time Series Resistance Monitoring in PV Systems; NREL (National Renewable Energy Laboratory)

We apply the physical principles of a familiar method, suns-Voc, to a new application: the real-time detection of series resistance changes in modules and systems operating outside. The real-time series resistance (RTSR) method that we describe avoids the need for collecting IV curves or constructing full series-resistance-free IV curves. RTSR is most readily deployable at the module level on apply the physical principles of a familiar method, suns-Voc, to a new application: the real-time detection of series resistance changes in modules and systems operating outside. The real-time series resistance (RTSR) method that we describe avoids the need for collecting IV curves or constructing full series-resistance-free IV curves. RTSR is most readily deployable at the module level on micro-inverters or module-integrated electronics, but it can also be extended to full strings. Automated detection of series resistance increases can provide early warnings of some of the most common reliability issues, which also pose fire risks, including broken ribbons, broken solder bonds, and contact problems in the junction or combiner box. We describe the method in detail and describe a sample application to data collected from modules operating in the field.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1215193
Report Number(s):
NREL/PR-5J00-63998
Resource Type:
Conference
Resource Relation:
Conference: 42nd IEEE Photovoltaic Specialists Conference, 14-19 June 2015, New Orleans, Louisiana
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE PV; Monitoring