Disturbance observer based robust voltage control of photovoltaic generator interfaced by current mode buck converter

M. Sitbon, I. Aharon, M. Averbukh, D. Baimel, M. Sassonker (Elkayam)

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

In this paper, a new control method for photovoltaic generator is presented. The novel method is implemented on photovoltaic generator charging a battery storage system thru buck converter. The controller tasks are re-shaping the buck plant converter, and cancel its right half-pole while keeping tight reference tracking and disturbance rejection. Moreover, the integrated system of generator-converter-load possesses nonlinear behavior due to the varying environmental conditions and the boundaries of photovoltaic generator versus battery state of charge, as revealed from an analysis of small-signal equations for possible unstable condition. It was shown that system constrains consequence in a complicated control task where standard controller of an inverse plant is insufficient to stabilize the system. Then a proportional integral controller is implemented. However, it is shown that varying closed-loop performance from over-damped to under-damped, depending on the operating point. Eventually utilizing a robust disturbance observer controller reveals that closed-loop performance remains nearly nominal throughout the entire operation range.

Original languageEnglish
Article number112622
JournalEnergy Conversion and Management
Volume209
DOIs
StatePublished - 1 Apr 2020

Keywords

  • Buck converter
  • Disturbance observer
  • Microgrid
  • PV
  • Photovoltaic generator
  • Robust control

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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