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Title: Model and Validation of Single-Axis Tracking with Bifacial Photovoltaics: Preprint

Abstract

Single-axis tracking is a cost effective deployment strategy for large-scale ground-mount photovoltaic (PV) systems in regions with high direct-normal irradiance (DNI). Bifacial modules in 1-axis tracking systems boost energy yield by 4% - 15% depending on module type and ground albedo, with a global average of 9%. This benefit is in addition to the 15%-25% energy gain already afforded by single-axis tracking relative to fixed-tilt deployments. Here we compare model results against field performance data for two side-by-side bifacial / monofacial tracked systems - one in Albuquerque NM, and one in eastern Oregon. The Albuquerque system shows monthly rear irradiance gain of 10-14.9%, and the Oregon bifacial system has an average performance ratio 9.4% higher than the monofacial system. Both results match bifacial irradiance model results within uncertainty. Simulations show that smart tracking algorithms can offer more than 1% improvement on annual energy yield by adjusting tilt angle under cloudy conditions. Finally, ray-tracing simulations investigated edge brightening, suggesting 15%-25% increase in rear irradiance at the ends of tracker rows, but up to 20% loss from center-mounted torque tubes, creating multiple shadows.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. University of Arizona
  3. NRGWise Lighting
  4. Sandia National Laboratories
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1478728
Report Number(s):
NREL/CP-5K00-72039
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the World Conference on Photovoltaic Energy Conversion (WCPEC-7), 10-15 June 2018, Waikoloa, Hawaii
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; solar; photovoltaics; bifacial tracking

Citation Formats

Deline, Christopher A, Pelaez, Silvana A, Greenberg, Peter, Stein, Josh, and Kostuk, Raymond. Model and Validation of Single-Axis Tracking with Bifacial Photovoltaics: Preprint. United States: N. p., 2018. Web.
Deline, Christopher A, Pelaez, Silvana A, Greenberg, Peter, Stein, Josh, & Kostuk, Raymond. Model and Validation of Single-Axis Tracking with Bifacial Photovoltaics: Preprint. United States.
Deline, Christopher A, Pelaez, Silvana A, Greenberg, Peter, Stein, Josh, and Kostuk, Raymond. Thu . "Model and Validation of Single-Axis Tracking with Bifacial Photovoltaics: Preprint". United States. https://www.osti.gov/servlets/purl/1478728.
@article{osti_1478728,
title = {Model and Validation of Single-Axis Tracking with Bifacial Photovoltaics: Preprint},
author = {Deline, Christopher A and Pelaez, Silvana A and Greenberg, Peter and Stein, Josh and Kostuk, Raymond},
abstractNote = {Single-axis tracking is a cost effective deployment strategy for large-scale ground-mount photovoltaic (PV) systems in regions with high direct-normal irradiance (DNI). Bifacial modules in 1-axis tracking systems boost energy yield by 4% - 15% depending on module type and ground albedo, with a global average of 9%. This benefit is in addition to the 15%-25% energy gain already afforded by single-axis tracking relative to fixed-tilt deployments. Here we compare model results against field performance data for two side-by-side bifacial / monofacial tracked systems - one in Albuquerque NM, and one in eastern Oregon. The Albuquerque system shows monthly rear irradiance gain of 10-14.9%, and the Oregon bifacial system has an average performance ratio 9.4% higher than the monofacial system. Both results match bifacial irradiance model results within uncertainty. Simulations show that smart tracking algorithms can offer more than 1% improvement on annual energy yield by adjusting tilt angle under cloudy conditions. Finally, ray-tracing simulations investigated edge brightening, suggesting 15%-25% increase in rear irradiance at the ends of tracker rows, but up to 20% loss from center-mounted torque tubes, creating multiple shadows.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}

Conference:
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