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Accession Number DE2012-1045715
Title Photovoltaic Shading Testbed for Module-Level Power Electronics.
Publication Date May 2012
Media Count 32p
Personal Author C. Deline J. Forrest J. Meydbray M. Donovan
Abstract This document describes a repeatable test procedure that attempts to simulate shading situations, as would be experienced by typical residential rooftop photovoltaic (PV) systems. This type of shading test is particularly useful to evaluate the impact of different power conversion setups, including microinverters, DC power optimizers and string inverters, on overall system performance. The performance results are weighted based on annual estimates of shade to predict annual performance improvement. A trial run of the test procedure was conducted with a side by side comparison of a string inverter with a microinverter, both operating on identical 8kW solar arrays. Considering three different shade weighting conditions, the microinverter was found to increase production by 3.7% under light shading, 7.8% under moderate shading, and 12.3% under heavy shading, relative to the reference string inverter case. Detail is provided in this document to allow duplication of the test method at different test installations and for different power electronics devices.
Keywords Inverters
Photovoltaic power plants
Solar energy

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 97N - Solar Energy
Corporate Author National Renewable Energy Lab., Golden, CO.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1303
Contract Number DE-AC36-08GO28308

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