Characterization method and analysis of misalignments in micro-concentrator photovoltaic modules.

Area of Science:

• Photovoltaics
• Optical Engineering
• Materials Science

Background:

• Micro-scale concentrator photovoltaics (micro-CPV) offer high efficiency and low cost.
• Miniaturization of optics and cells presents performance advantages.
• Tight mechanical tolerances are required due to small cell sizes and narrow angular acceptance.

Purpose of the Study:

• To develop and validate a method for characterizing optical and cell misalignments in micro-CPV modules.
• To assess the impact of these misalignments on module performance.
• To establish a quality control inspection technique for micro-CPV manufacturing.

Main Methods:

• Image acquisition and processing to determine lens-cell unit misalignments.
• Application of the method to a 572-unit micro-CPV module.
• Validation using an experimental technique leveraging the module's embedded tracking system.

Main Results:

• Statistical distributions of misalignments were analyzed for different tracking positions.
• Residuals were determined, demonstrating the method's consistency.
• The impact of misalignment distributions on the module's IV curve was discussed.

Conclusions:

• The developed image-based method effectively characterizes misalignments in micro-CPV modules.
• The technique provides crucial data for quality control in high-efficiency photovoltaic systems.
• Understanding misalignment impact is key to optimizing micro-CPV performance and reliability.