Photovoltaic differential power converter trade-offs as a consequence of panel variation

Katherine A. Kim, Pradeep S. Shenoy, Philip T Krein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Photovoltaic (PV) elements have inherent variation between cells and panels due to manufacturing tolerance, degradation, and situational differences. This variation increases over system lifetime and creates maximum power point current mismatch that reduces output power when PV elements are strung in series. Traditionally, mismatch loss is addressed using cascaded converters. However, this research examines a differential converter architecture that achieves higher efficiency by processing a fraction of the total power. The effect of PV maximum power point (MPP) current variance on output power is modeled and examined using Monte Carlo simulation for the series string architecture with and without bypass diodes, and the PV-to-Bus and PV-to-PV differential power processing (DPP) architectures at various power ratings. Hot spotting can be a problem that significantly reduces output power. PV elements at fault can be bypassed, passively or actively, to reduce power loss. Simulation results show that both DPP architectures employing active bypass are able to compensate mismatch over the 25-year lifetime of a PV system with converters sized at approximately 10-20% of the panel ratings.

Original languageEnglish (US)
Title of host publication2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012
DOIs
StatePublished - 2012
Event2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012 - Kyoto, Japan
Duration: Jul 10 2012Jul 13 2012

Other

Other2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012
CountryJapan
CityKyoto
Period7/10/127/13/12

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Modeling and Simulation

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    Kim, K. A., Shenoy, P. S., & Krein, P. T. (2012). Photovoltaic differential power converter trade-offs as a consequence of panel variation. In 2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012 [6251789] https://doi.org/10.1109/COMPEL.2012.6251789