Recovery of Inter-Row Shading Losses Using Differential Power-Processing Submodule DC-DC Converters

Christopher Deline, Kate Doubleday, Carlos Olalla, Beomseok Choi, Dragan Maksimovic

Research output: Contribution to journalArticlepeer-review

15 Scopus Citations


Large commercial photovoltaic (PV) systems can experience regular and predictable energy loss due to both inter-row shading and reduced diffuse irradiance in tightly spaced arrays. This paper investigates the advantages of replacing bypass diodes with submodule-integrated DC-DC converters (subMICs) to mitigate these losses. Yearly simulations of commercial-scale PV systems were conducted considering a range of row-to-row pitches. In the limit case of array spacing (unity ground coverage), subMICs can confer a 7% increase in annual energy output and peak energy density (kW h/m2). Simulation results are based on efficiency assumptions experimentally confirmed by prototype submodule differential power-processing converters.

Original languageAmerican English
Pages (from-to)512-517
Number of pages6
JournalSolar Energy
StatePublished - 1 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016.

NREL Publication Number

  • NREL/JA-5J00-65132


  • distributed power electronics
  • energy conversion
  • MLPE
  • partial shading
  • photovoltaic systems
  • power electronics
  • power system simulation
  • subMICs


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