Preprint Article Version 1 This version is not peer-reviewed

A Robust Control of Two-Stage Grid-Tied PV Systems Employing Integral Sliding Mode Theory

Version 1 : Received: 26 August 2018 / Approved: 27 August 2018 / Online: 27 August 2018 (11:33:45 CEST)

A peer-reviewed article of this Preprint also exists.

Kihal, A.; Krim, F.; Talbi, B.; Laib, A.; Sahli, A. A Robust Control of Two-Stage Grid-Tied PV Systems Employing Integral Sliding Mode Theory. Energies 2018, 11, 2791. Kihal, A.; Krim, F.; Talbi, B.; Laib, A.; Sahli, A. A Robust Control of Two-Stage Grid-Tied PV Systems Employing Integral Sliding Mode Theory. Energies 2018, 11, 2791.

Journal reference: Energies 2018, 11, 2791
DOI: 10.3390/en11102791

Abstract

This contribution considers an improved control scheme for three-phase two-stage grid-tied photovoltaic (PV) power system based on integral sliding mode control (ISMC) theory. The proposed control scheme consists of maximum power point tracking (MPPT), DC-Link voltage regulation and grid currents synchronization. A modified voltage-oriented maximum power point tracking (VO-MPPT) method based on ISMC theory is proposed for design of an enhanced MPPT under irradiation changes. Moreover, a novel DC-Link voltage control based on ISMC theory is proposed in order to achieve good regulation of DC-Link voltage over its reference. To inject the generated PV power into the grid with high quality, a voltage oriented control based on space vector modulation (SVM) and ISMC (VOC-ISMC-SVM) has been developed to control the grid currents synchronization. Numerical simulations are performed in Matlab/SimulinkTM environment in order to evaluate the proposed control strategy. In comparison with conventional control scheme, the developed control strategy provides an accurate MPP tracking with less power oscillation as well as a fast and an accurate DC-Link regulation under climatic conditions variations. Moreover, the transfer of the extracted power into the grid is achieved with high quality.

Subject Areas

grid-tied photovoltaic system; maximum power point tracking (MPPT); voltage oriented control (VOC); integral sliding mode control (ISMC)theory; dc-link control.

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