Mitigation of Hot-Spots in Photovoltaic Systems Using Distributed Power Electronics

Christopher Deline, Carlos Olalla, Md. Hasan, Dragan Maksimovic

Research output: Contribution to journalArticlepeer-review

50 Scopus Citations

Abstract

In the presence of partial shading and other mismatch factors, bypass diodes may not offer complete elimination of excessive power dissipation due to cell reverse biasing, commonly referred to as hot-spotting in photovoltaic (PV) systems. As a result, PV systems may experience higher failure rates and accelerated ageing. In this paper, a cell-level simulation model is used to assess occurrence of hot-spotting events in a representative residential rooftop system scenario featuring a moderate shading environment. The approach is further used to examine how well distributed power electronics converters mitigate the effects of partial shading and other sources of mismatch by preventing activation of bypass diodes and thereby reducing the chances of heavy power dissipation and hot-spotting in mismatched cells. The simulation results confirm that the occurrence of heavy power dissipation is reduced in all distributed power electronics architectures, and that submodule-level converters offer nearly 100% mitigation of hot-spotting. In addition, the paper further elaborates on the possibility of hot-spot-induced permanent damage, predicting a lifetime energy loss above 15%. This energy loss is fully recoverable with submodule-level power converters that mitigate hot-spotting and prevent the damage.

Original languageAmerican English
Article number726
Number of pages16
JournalEnergies
Volume11
Issue number4
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 by the authors.

NREL Publication Number

  • NREL/JA-5K00-71323

Keywords

  • Accelerated ageing
  • Balancing
  • Bypass diodes
  • Converters
  • Hot-spotting
  • Partial-shading
  • Photovoltaics
  • Power electronics
  • Reliability
  • SubMICs

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