Photovoltaic Shading Testbed for Module-Level Power Electronics

Deline, C. ; Meydbray, J. ; Donovan, M. ; Forrest, J.

National Renewable Energy Laboratory (U.S.)

关键词: Microinverter;    Shading Microinverter;    14 Solar Energy;    Inverters;    Solar Energy - Photovoltaics;   

DOI  :  10.2172/1045715
RP-ID  :  NREL/TP-5200-54876
RP-ID  :  AC36-08GO28308
RP-ID  :  1045715

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.