A Discrete-Time Robust Adaptive PI Controller for Grid-Connected Voltage Source Converter with LCL Filter

Paulo J. D. O. Evald; Guilherme V Hollweg; Rodrigo V. Tambara; Hilton A. Gründling

doi:10.18618/REP.2021.1.0053

Authors

Paulo J. D. O. Evald Federal University of Santa Maria, Santa Maria - RS, Brazil and Franciscan University, Santa Maria - RS, Brazil
Guilherme V Hollweg Federal University of Santa Maria, Santa Maria - RS, Brazil
Rodrigo V. Tambara Federal University of Santa Maria, Santa Maria - RS, Brazil
Hilton A. Gründling Federal University of Santa Maria, Santa Maria - RS, Brazil

DOI:

https://doi.org/10.18618/REP.2021.1.0053

Keywords:

Computational Burden Reduction, Discretetime Controller, Grid-tied Converters, LCL Filter, Robust Adaptive PI Controller

Abstract

In this work, it is presented a new direct discrete-time robust adaptive PI (Proportional Integral) Controller for grid-injected current control loop of a voltage source converter with LCL filter. The mathematical background is based on Robust Model Reference Adaptive Control theory. However, the proposed controller is straightforward, it does not need a reference model and has capability to track directly currents reference. This approach simplifies significantly controller design, resulting in a reformulation of parameters vector used for adaptation of adjustable gains. It turns the controller robust to unmodelled dynamics, while avoid the complexity inherent to the conventional high order adaptive controllers for grid-connected power systems. Besides, it is highlighted that proposed controller does not need resonant controllers for grid disturbance rejection, or require any knowledge of grid parameters, lines impedance or load power demand. Also, due to its simple structure, it is easily implemented and does not require a high processing capacity. Furthermore, the effectiveness of the control strategy in terms of reference tracking, harmonics content and robustness to the grid impedance variation is corroborated through experiments.

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Author Biographies

Paulo J. D. O. Evald, Federal University of Santa Maria, Santa Maria - RS, Brazil and Franciscan University, Santa Maria - RS, Brazil

received the B.Sc. in Automation Engineering and M. Sc. in Computer Engineering by Federal University of Rio Grande at (FURG), in 2016 and 2018, respectively. He worked as Auxiliary Professor at Federal University of Rio Grande, from 2017 to 2019. Currently, he is Ph.D. candidate in Electrical Engineer at Federal University of Santa Maria (UFSM) and Assistant Professor at Franciscan University (UFN). Besides, he is a researcher at the Power and Control Electronics Group (GEPOC). Also, he is a effective member of the Brazilian Society of Power Electronics (SOBRAEP). Your main research interests include adaptive control theory, renewable energy and power electronics control applications.

Guilherme V Hollweg, Federal University of Santa Maria, Santa Maria - RS, Brazil

received the B.Sc. and M. Sc. in Electrical Engineering by UFSM, in 2017 and 2019, respectively. Currently, he is a Ph.D. student in Electrical Engineer at UFSM. Besides, he is a researcher at GEPOC. Your main research interests include adaptive control theory, non-linear control theory, renewable energy and power electronics control applications.

Rodrigo V. Tambara, Federal University of Santa Maria, Santa Maria - RS, Brazil

received the degree of Technician in Electrotechnics by Industrial Technical College of Santa Maria (CTISM) in 2004, B.Sc., M.Sc. and Ph.D. in Electrical Engineer by UFSM in 2008, 2010 and 2014, respectively. He worked as Assistant Professor at University Franciscan Centre (UNIFRA), from 2014 to 2016, and also worked as Adjunct Professor at UFSM, from 2016 to 2018. Currently, he is currently Adjunct Professor at CTISM and Substitute Coordinator of the higher course in Technology in Industrial Electronics. Besides, he is a researcher at GEPOC and at the Research and Development Group on Electrical and Computer Systems (GSEC). Also, he is a effective member of SOBRAEP. Your main research interests include theory and application of control systems, electronic instrumentation and power electronics.

Hilton A. Gründling, Federal University of Santa Maria, Santa Maria - RS, Brazil

received the B.Sc. in Electronics Engineering by Pontifical University of Rio Grande do Sul (PUCRS) in 1977, M. Sc. in Electrical Engineering from Federal University of Santa Catarina (UFSC) in 1980 and Ph.D. in Electronic and Computer Engineering by Technological Institute of Aeronautics (ITA) in 1995. He worked as Titular Professor at UFSM, from 1980 to 2016. Since 2017, he is Full Professor at UFSM Campus Cachoeira do Sul (UFSM-CS). Besides, he is a researcher at GEPOC. Your main research interests include discrete-time robust adaptive controllers and grid-tied power systems.

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