A Generic Robust Model-Based Estimator for Active Damping of Single-Phase GridTied Inverters

Arthur de Abreu Romão; Newton da Silva

doi:10.18618/REP.2022.1.0038

Authors

Arthur de Abreu Romão State University of Londrina (UEL), Londrina – Paraná, Brazil
Newton da Silva State University of Londrina (UEL), Londrina – Paraná, Brazil

DOI:

https://doi.org/10.18618/REP.2022.1.0038

Keywords:

Control, Current Estimator, Grid-connected inverters, Power quality, renewable energy, stability

Abstract

This paper presents the design and analysis of a signal estimator with improved robustness applied in the active damping (AD) of a single-phase grid-tied inverter with LCL low-pass filter. The proposed estimator is based on the mathematical model of the LCL filter, with resistors in series with the converter-side inductor and capacitor for improving robustness. The implementation method is also capable of estimate multiple filter signals. The control strategy presented uses a virtual resistor based AD, that suppresses the resonance ensuring stability and robustness, helping comply with power quality standards, such as IEEE 1547 and IEC 61727. The signal necessary for achieving the AD is obtained through the estimator, dismissing the use of additional sensors. The current control structure uses grid-side current feedback with proportional-resonant controller and harmonic compensation. The system is designed by the root locus approach to achieve stability despite grid parameter variance. The estimator and overall system is analyzed through mathematical modeling, computational simulation and experimental setup. The results show that the estimator presented is capable of providing the necessary AD feedback signal, even with grid inductance variation.

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Author Biographies

Arthur de Abreu Romão, State University of Londrina (UEL), Londrina – Paraná, Brazil

received BSc. in Electrical Engineer (2018) by State University of Londrina (UEL) and is currently a masters degree student in the State University of Londrina. His areas of interest are power electronics, grid-tied Eletrôn. Potên., Florianópolis, v. 27, n. 1, p. 78-86, jan./mar. 2022 86 inverters, digital control and energy quality.

Newton da Silva , State University of Londrina (UEL), Londrina – Paraná, Brazil

received BSc. in Electrical Engineering (1991) from Federal University of Santa Maria, MSc. in Electrical Engineering (1994) from the Federal University of Santa Cataria (UFSC) and PhD. in Electrical Engineering (2012) from Unicamp. He has been a professor at the State University of Londrina (UEL), since 2003. His areas of interest are power electronics, power quality, grid-connected energy systems and digital control of converters.

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