A Robust Continuous-Time MPC of a DC-DC Boost Converter Interfaced with a Grid-Connected Photovoltaic System

Rachid Errouissi, Ahmed Al-Durra, S. M. Muyeen

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

The main function of the DC-DC converter in a grid-connected photovoltaic (PV) system is to regulate the terminal voltage of the PV arrays to ensure delivering the maximum power to the grid. The purpose of this paper is to design and practically implement a robust continuous-time model predictive control (CTMPC) for a dc-dc boost converter, feeding a three-phase inverter of a grid-connected PV system to regulate the PV output voltage. In CTMPC, the system behavior is predicted based on Taylor series expansion, raising concerns about the prediction accuracy in the presence of parametric uncertainty and unknown external disturbances. To overcome this drawback, a disturbance observer is designed and combined with CTMPC to enhance the steady-state performance in the presence of model uncertainty and unknown disturbance such as the PV current, which varies nonlinearly with the operating point. An interesting feature is that the composite controller reduces to a conventional PI controller plus a predictive term that allows further improvement of the dynamic performance over the whole operating range. The effectiveness of the proposed controller was tested numerically and validated experimentally with the consideration of the grid-connected PV inverter system and its controller.

Original languageEnglish
Pages (from-to)1619-1629
Number of pages11
JournalIEEE Journal of Photovoltaics
Volume6
Issue number6
DOIs
Publication statusPublished - Nov 2016
Externally publishedYes

Keywords

  • Continuous-time model predictive control (CTMPC)
  • dc-dc boost converter
  • disturbance observer (DO)
  • grid-connected inverter system
  • photovoltaic (PV) system
  • proportional-integral (PI) observer
  • renewable energy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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