Enhancing efficiency and robustness of a photovoltaic power system under partial shading

Yanzhi Wang, Xue Lin, Younghyun Kim, Naehyuck Chang, Massoud Pedram

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

26 Scopus citations

Abstract

Photovoltaic (PV) power systems have been widely applied in commercial and domestic facilities. Electrical energy storage (EES) systems are mandatory in standalone PV systems for continuous power supply. In this paper the efficiency and robustness enhancement methods for PV systems under partial shading have been investigated. Partial shading due to moving clouds and shadows of nearby obstacles on a PV module array causes significant efficiency degradation, since shaded and non-shaded PV modules have large discrepancy in their maximum power points (MPPs). Use of Individual charger for each PV module may mitigate the negative effect from partial shading. However, this method alone may still face severe energy efficiency degradation caused by i) the energy loss due to parasitic effects in the EES elements under variable incoming power from the PV modules and ii) the energy loss in each charger incurred by potentially high imbalance between its input and output voltages. This paper proposes three methods to enhance the PV system efficiency and robustness under partial shading: i) incorporation of a HEES (hybrid electrical energy storage) system into the PV system, ii) extension of the MPTT (maximum power transfer tracking) approach, and iii) dynamic PV module reconfiguration. The three proposed methods can be effectively combined together, yielding a significant efficiency gain ranging from 17.1% to 53.3% compared with the baseline systems.

Original languageEnglish (US)
Title of host publicationProceedings of the 13th International Symposium on Quality Electronic Design, ISQED 2012
Pages592-600
Number of pages9
DOIs
StatePublished - Jul 16 2012
Event13th International Symposium on Quality Electronic Design, ISQED 2012 - Santa Clara, CA, United States
Duration: Mar 19 2012Mar 21 2012

Publication series

NameProceedings - International Symposium on Quality Electronic Design, ISQED
ISSN (Print)1948-3287
ISSN (Electronic)1948-3295

Other

Other13th International Symposium on Quality Electronic Design, ISQED 2012
CountryUnited States
CitySanta Clara, CA
Period3/19/123/21/12

Keywords

  • Photovoltaic system
  • dynamic reconfiguration
  • hybrid electrical energy storage system
  • partial shading

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Safety, Risk, Reliability and Quality

Fingerprint Dive into the research topics of 'Enhancing efficiency and robustness of a photovoltaic power system under partial shading'. Together they form a unique fingerprint.

  • Cite this

    Wang, Y., Lin, X., Kim, Y., Chang, N., & Pedram, M. (2012). Enhancing efficiency and robustness of a photovoltaic power system under partial shading. In Proceedings of the 13th International Symposium on Quality Electronic Design, ISQED 2012 (pp. 592-600). [6187554] (Proceedings - International Symposium on Quality Electronic Design, ISQED). https://doi.org/10.1109/ISQED.2012.6187554