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Backstepping Control of a Buck-Boost Converter in an Experimental PV-System

Vazquez, Jesus R.;Martin, Aranzazu D.

  • Received : 2014.11.14
  • Accepted : 2015.05.23
  • Published : 2015.11.20

Abstract

This paper presents a nonlinear method to control a DC-DC converter and track the Maximum Power Point (MPP) of a Photovoltaic (PV) system. A backstepping controller is proposed to regulate the voltage at the input of a buck-boost converter by means of Lyapunov functions. To make the control initially faster and avoid local maximum, a regression plane is used to estimate the reference voltages that must be obtained to achieve the MPP and guarantee the maximum power extraction, modifying the conventional Perturb and Observe (P&O) method. An experimental platform has been designed to verify the validity and performance of the proposed control method. In this platform, a buck-boost converter has been built to extract the maximum power of commercial solar modules under different environmental conditions.

Keywords

Backstepping;Buck-Boost Converter;Experimental;Maximum Power Point;Photovoltaic

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