Advanced nonlinear control of a grid-connected photovoltaic power system using N-cascaded H-bridge multilevel inverters

H. Katir*, A. Abouloifa, I. Lachkar, K. Noussi, F. Giri, J. M. Guerrero

*Corresponding author for this work

Research output: Contribution to journalConference article in JournalResearchpeer-review

9 Citations (Scopus)
64 Downloads (Pure)

Abstract

The present paper discusses the modelling and the nonlinear control of a DC/AC conversion system composed of photovoltaic arrays, boost converters, DC bus capacitors, N-cascaded H-bridge multilevel inverters (CHBMI) and an L-filter linked to a single-phase grid. This work aims at achieving threefold control objectives: i) regulating the voltages across the PV panels in order to extract the available maximum power, ii) guaranteeing a unitary power factor (UPF) by forcing the grid current to be sinusoidal and in phase with the electric network voltage, iii) controlling the DC-link voltages to track their given references. The achievement of these objectives is done thanks to a regulator based on a multi-loop structure. Indeed, on one hand, each panel is individually controlled to track the maximum power point; on the other hand, two cascaded loops aim at ensuring a satisfactory power factor correction and DC-link voltages regulation. The proposed regulator is developed using the nonlinear backstepping approach and some tools from Lyapunov stability. The simulation results, obtained using MATLAB/SIMULINK/ SimPowerSystems environment, prove that the synthesized regulator meets its objectives and presents interesting performance in terms of tracking and regulation.

Original languageEnglish
Book seriesIFAC-PapersOnLine
Volume53
Issue number2
Pages (from-to)12859-12864
Number of pages6
ISSN2405-8963
DOIs
Publication statusPublished - 2020
Event21st IFAC World Congress 2020 - Berlin, Germany
Duration: 12 Jul 202017 Jul 2020

Conference

Conference21st IFAC World Congress 2020
Country/TerritoryGermany
CityBerlin
Period12/07/202017/07/2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 The Authors. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0)

Keywords

  • Backstepping approach
  • Cascaded H-bridge multilevel inverter
  • Grid
  • Lyapunov
  • Nonlinear control
  • PFC
  • PV system

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