Sliding mode combined with PI controller applied for current control of grid-connected single-phase inverter under distorted voltage conditions

Lucas D. Augusto; Luís F. N. Lourenço; José A. T. Altuna; Alfeu J. Sguarezi Filho

doi:10.18618/REP.e202536

Authors

Lucas D. Augusto Universidade Federal do ABC
Luís F. N. Lourenço Universidade de São Paulo https://orcid.org/0000-0002-8280-0268
José A. T. Altuna Universidade Federal do ABC
Alfeu J. Sguarezi Filho Universidade Federal do ABC

DOI:

https://doi.org/10.18618/REP.e202536

Keywords:

Grid-connected inverters, Harmonic suppression, Single-phase inverter, Sliding mode control, Voltage distortion

Abstract

Grid-connected inverters must be synchronized with the electrical grid to ensure stability and efficiency. However, abrupt grid distortions and harmonic components can degrade the controller’s performance. This paper proposes a sliding mode controller combined with a PI controller for current control in a single-phase grid-connected inverter to enhance Total Harmonic Distortion performance. The primary contribution of this work is the development of a nonlinear controller with a constant switching frequency, addressing the common chattering problem in sliding mode controllers while maintaining adequate performance under distorted voltage conditions using a Phase-Locked Loop. The controller's performance was evaluated through laboratory experiments under normal and distorted grid conditions, and the results were compared with a repetitive controller, demonstrating its effectiveness in suppressing harmonics in regular operation and under distorted grid voltage conditions.

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Author Biographies

Lucas D. Augusto, Universidade Federal do ABC

received the electrical engineering degree from Centro Universitário da FEI, São Bernardo do Campo, Brazil, in 2011, and the master’s degree in electrical engineering from the Federal University of ABC, Santo André, Brazil, in 2022, respectively, where he is currently pursuing the Ph.D. degree in energy engineering. His research focuses on converters, grid-connected systems, photovoltaic systems, power electronics, real-time control, and embedded systems.

Luís F. N. Lourenço, Universidade de São Paulo

received the Ph.D. degree in electrical engineering from the Polytechnic School, University of São Paulo (USP), São Paulo, Brazil, in 2022. In 2021, he was a Visiting Ph.D. Student at the Laboratoire des Signaux et Systèmes (L2S), Centrale Supélec, University Paris-Saclay (UPS), Gif-sur-Yvette, France. He is currently an Associate Professor at the Institute of Energy and Environment, USP. His research interests include grid-forming converters, non linear control, renewable energy integration, HVDC, microgrids, and control and stability of power systems.

José A. T. Altuna, Universidade Federal do ABC

received a bachelor’s degree in Electronic Engineering 1986 from the Universidad Nacional de Ingenieria Lima - Peru, a master's degree in Electrical Engineering 1997 and a PhD in Electrical Engineering 2002, both from the State University of Campinas - UNICAMP and Post-doctorate PNPD CAPES (2013-2015) at UFABC. He was linked to the company Commodity Systems Empreendimentos e Participações LTDA until July 2012, coordinating the company's R\&D projects. He is currently Adjunct Professor at the Federal University of ABC - UFABC. He has experience in induction machine control acting as generator and motor, real-time control systems, signal processing, design of systems based on DSPs and FPGAs, low-level software for embedded systems, and speech recognition systems.

Alfeu J. Sguarezi Filho, Universidade Federal do ABC

received the master’s and Ph.D. degrees in electrical engineering from the Faculty of Electrical and Computer Engineering, University of Campinas (Unicamp), Campinas, Brazil, in 2007 and 2010, respectively. He is currently an Associate Professor with the Federal University of ABC (UFABC), Santo André, Brazil. He has authored several articles in national and international scientific journals and book chapters in the areas of electrical machines, machine drives, electric vehicles, power electronics, wind, and photovoltaic energies.

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