Robust nonlinear controller design for three-phase grid-connected photovoltaic systems under structured uncertainties

M. A. Mahmud, M. J. Hossain, H. R. Pota, N. K. Roy

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

This paper presents a robust nonlinear controller design for a three-phase grid-connected photovoltaic (PV) system to control the current injected into the grid and the dc-link voltage for extracting maximum power from PV units. The controller is designed based on the partial feedback linearization approach, and the robustness of the proposed control scheme is ensured by considering structured uncertainties within the PV system model. An approach for modeling the uncertainties through the satisfaction of matching conditions is provided. The superiority of the proposed robust controller is demonstrated on a test system through simulation results under different system contingencies along with changes in atmospheric conditions. From the simulation results, it is evident that the robust controller provides excellent performance under various operating conditions.

Original languageEnglish
Article number6807814
Pages (from-to)1221-1230
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume29
Issue number3
DOIs
Publication statusPublished - Jun 2014
Externally publishedYes

Keywords

  • Grid-connected PV system
  • matching conditions
  • partial feedback linearization
  • robust nonlinear controller
  • structured uncertainty

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