OSV-MPC for Harmonic and Zero-Sequence Compensation in Four-Wire Off-Grid Microgeneration Systems Based on SEIG

Carlos A. Souza; Gabriel Maier Cocco; Robinson F. de Camargo; Fábio E. Bisogno; Martin Wolter

doi:10.18618/REP.e202458

Authors

Carlos A. Souza Universidade Federal de Santa Maria https://orcid.org/0000-0002-7334-7457
Gabriel Maier Cocco Otto-von-Guericke University Magdeburg https://orcid.org/0000-0002-2650-6443
Robinson F. de Camargo Universidade Federal de Santa Maria https://orcid.org/0000-0001-5858-1635
Fábio E. Bisogno Koblenz University of Applied Sciences
Martin Wolter Otto-von-Guericke University Magdeburg https://orcid.org/0000-0003-0281-0501

DOI:

https://doi.org/10.18618/REP.e202458

Keywords:

Off-Grid Microgeneration, Induction Generator, Four-Wire System, Model Predictive Control, Zero-Sequence Voltage, Harmonic Current Compensation

Abstract

This paper proposes a finite control set model predictive control (FCS-MPC) strategy to address voltage regulation in isolated four-wire microgeneration systems based on self-excited induction generators. The FCS-MPC approach enables a simpler and more functional imbalance controller design. The controller determines the optimal switching vector through a cost function that employs a weighting factor for the different control variables. It effectively tracks distorted current references and prevents voltage imbalance, even in a system without frequency regulation. The employed inverter is a four-leg voltage source inverter, also known as a distribution static synchronous compensator, which provides the necessary reactive power and compensates for harmonic content along with the zero-sequence component, ensuring balanced three-phase voltages at the point of common coupling, even with unbalanced loads. The proposed control leverages the instantaneous power theory for synchronization, thereby replacing methods such as the phase-locked loop. Experimental results validate the effectiveness of the proposed control approach and assess the performance of the system in accordance with power quality standards.

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Author Biographies

Carlos A. Souza, Universidade Federal de Santa Maria

received his B.Sc. degree (2016) in Electrical Engineering from the Integrated Regional University of Alto Uruguai and Missões (URI), Brazil, and the M.Sc. degree (2019) from the Federal University of Santa Maria (UFSM), Brazil. Currently, he is working towards a Ph.D. degree at UFSM with the Power Electronics and Control Research Group (GEPOC). His research interests include microgeneration systems and applied control.

Gabriel Maier Cocco, Otto-von-Guericke University Magdeburg

received his B.Sc. degree in Electrical Engineering from the Federal University of Pampa, Brazil, in 2018, and his M.Sc. degree from the Federal University of Santa Maria (UFSM), Brazil, in 2021. He is currently a Ph.D. candidate with co-supervision at UFSM and Otto-von-Guericke University Magdeburg, Germany. His research interests include renewable power generation and conditioning, as well as modeling and control of power converters.

Robinson F. de Camargo, Universidade Federal de Santa Maria

received his B.Sc. (2000), M.Sc. (2002), and Ph.D. (2006) degrees in Electrical Engineering from the Federal University of Santa Maria (UFSM), Brazil. He was the Coordinator of the Undergraduate Program in Control and Automation Engineering at UFSM from 2010 to 2012. Currently, he is head of the Department of Electric Power Processing at UFSM. His areas of interest include renewable energy sources, synchronization methods, power quality, DSTATCOM, and active power filters.

Fábio E. Bisogno, Koblenz University of Applied Sciences

received his B.Sc. (1999) and M.Sc. degrees in Electrical Engineering from the Federal University of Santa Maria (UFSM), Brazil, in 2001, and the Ph.D. degree in Electrical Engineering from Technische Universität Chemnitz, Germany, in 2006. He worked at the Fraunhofer Institute from 2003 to 2009. From 2009 to 2023, he worked as a Professor with UFSM. Currently, he is a Professor with the Koblenz University of Applied Sciences, Germany. His areas of interest are resonant converters, self-oscillating electronic converters, artificial lighting, and uninterruptible power supply.

Martin Wolter, Otto-von-Guericke University Magdeburg

received his diploma in Electrical Engineering in 2006, his Dr.-Ing degree in 2008, and his venia legendi in 2012, all from Leibniz University Hannover, Germany. From 2011 to 2015, he worked at 50Hertz Transmission GmbH in system operation concept development. Since 2015, he has been the head of the Chair of Electric Networks and Renewable Energy at Otto-von-Guericke University Magdeburg, Germany. His research topics are power system modeling and simulation, system security and system operation, as well as power system dynamics.

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