Disturbance Decoupling in Grid-Forming Inverters for Enhanced Dynamic Response

Amiron W. dos S. Serra; Luiz A. de S. Ribeiro; Mehdi Savaghebi

doi:10.18618/REP.e202528

Authors

Amiron W. dos S. Serra Universidade Federal do Maranhão https://orcid.org/0000-0002-2241-3653
Luiz A. de S. Ribeiro Universidade Federal do Maranhão https://orcid.org/0000-0001-8477-8546
Mehdi Savaghebi Technical University of Denmark https://orcid.org/0000-0001-6188-0265

DOI:

https://doi.org/10.18618/REP.e202528

Keywords:

control strategy, grid-forming inverters, disturbance rejection capability, disturbance input decoupling

Abstract

This paper presents a control strategy for grid-forming inverters, utilizing a cascaded dual-control scheme that integrates current and voltage controllers, along with an outer loop for regulating the injected active and reactive power. The proposed approach enhances system performance by addressing key challenges faced by grid-forming inverters. One of the highlights of this strategy is the improved disturbance rejection capability of the current controller, achieved through capacitor voltage decoupling. This modification effectively reduces the impact of disturbances on system performance. Additionally, the voltage controller incorporates the concept of disturbance input decoupling, which further improves the inverter’s dynamic response under varying operating conditions. Notably, the inclusion of disturbance input decoupling enhances the loop gain of the voltage controller in the low-frequency range, leading to superior performance of the inverter. Experimental results validate the efficacy of the proposed control strategy in managing real-word scenarios such as voltage sags, load changes and variations in power references. These findings highlight the robustness of the proposed methodology, demonstrating its potential for enhancing the operation of grid-forming inverters in modern power systems.

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Author Biographies

Amiron W. dos S. Serra, Universidade Federal do Maranhão

born in 04/05/1993 in São Luís, Maranhão, Brazil, received his B.Sc. degree in Industrial Electrical Engineering from the Federal Institute of Education, Science and Technology of Maranhão (IFMA), Brazil, in 2017, and his M.Sc. degree in Electrical engineering from Federal University of Maranhão (UFMA), Brazil, in 2019. He is currently pursuing the Ph.D. degree at Federal University of Maranhão. From September 2023 to September 2024, he was a Guest Ph.D. student at Technical University of Denmark (DTU). His research interests include power electronics, control systems and microgrids. Mr. Amiron is a student member of IEEE.

Luiz A. de S. Ribeiro, Universidade Federal do Maranhão

received the M.Sc. and Ph.D. degrees from the Federal University of Paraiba, Campina Grande, Brazil, in 1995 and 1998, respectively. During the period 1996–1998 and 2004–2006, he was a Visiting Scholar and Post doctor with the University of Wisconsin, Madison, WI, USA, working on parameter estimation and sensorless control of AC machines. In 2015, he was a Research Guest at Aalborg University, Denmark, working on power converters control for microgrid applications. In 2023 he was an Otto Mønsted Visiting Professor at Technical University of Denmark (DTU), Copenhagen working on design and control of power electronic converters for Power-to-X facilities. He is currently a Full Professor with the Department of Electrical Engineering, Federal University of Maranhão, Brazil. His research interests include design and control of power electronics converters, microgrids, and renewable energy. Dr. Ribeiro received two IEEE Energy Conversion Congress and Exposition prize paper awards.

Mehdi Savaghebi, Technical University of Denmark

received his B.Sc. degree from the University of Tehran, Iran, in 2004, and his M.Sc. and Ph.D. degrees from the Iran University of Science and Technology, Tehran, Iran, in 2006 and 2012, respectively, all in Electrical Engineering. From 2014 to 2017, he was a Postdoctoral Fellow at the Department of Energy, Aalborg University, Aalborg, Denmark, where he was an Associate Professor from 2017 to 2018. Then, he worked as an Associate Professor and Research Team Leader at the University of Southern Denmark, Odense, Denmark, for four years. Since 2022, he has been with the Department of Engineering Technology, Technical University of Denmark, Ballerup, Denmark, where he is currently serving as a Professor in Power Electronics-Enabled Power Systems and Head of the Energy Technology and Computer Science Section. His main research interests include renewable energy systems, microgrids, power quality and protection of electrical systems.

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