Mismatch losses in a PV system due to shortened strings

Smith, Ryan M.; Matam, Manjunath; Seigneur, Hubert

doi:10.1016/j.enconman.2021.114891

Mismatch losses in a PV system due to shortened strings

Journal Article · Tue Nov 02 00:00:00 EDT 2021 · Energy Conversion and Management

DOI:https://doi.org/10.1016/j.enconman.2021.114891· OSTI ID:1977086

Smith, Ryan M. ^[1]; Matam, Manjunath ^[2]; Seigneur, Hubert ^[2]

Pordis LLC, Austin, TX (United States); OSTI
University of Central Florida, Orlando, FL (United States)

Numerous events may require intentional removal of one or more photovoltaic modules from a string, shortening the length of the string relative to others within the array, resulting in a string length mismatch. The impact of such a mismatch is not well understood either in measurable operational effects (voltage, current, power) or in the potential effects on long-term module health. It is impractical to solely approach this problem experimentally due to the size and complexity of arrays that may experience string length shortening. Here this work presents simulations, validated through limited field experiments on a two string array, providing a basis from which more complex arrays and scenarios may be explored. Refinement of the simulation achieves an overall error in IMPP for the nominal (S₁) and test strings (S₂) between the simulation and experimental values, through all test conditions, of +0.35 ± 1.46% and -0.36 ± 1.58% respectively. Shortening one of two strings by one module results in a power loss greater than the power contribution of the module alone (1.29 module equivalents); the impact increases through the maximum test case of a six module mismatch with a power loss equivalent to more than 11 modules. The impact of using string-end blocking diodes is presented with an emphasis at the array maximum power point and at open circuit. Implications are discussed for arrays of higher complexity.

View Accepted Manuscript (DOE)

Research Organization:: University of Central Florida, Orlando, FL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008157

OSTI ID:: 1977086

Alternate ID(s):: OSTI ID: 1862537
OSTI ID: 2221792

Journal Information:: Energy Conversion and Management, Journal Name: Energy Conversion and Management Journal Issue: C Vol. 250; ISSN 0196-8904

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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