Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller
The grid-connected inverter is responsible for exchanging energy between the electrical grid and energy sources, such as photovoltaic and storage. The interconnection stability of these inverters may be addressed via their impedance characteristics, which comprise the control system and the ac filte...
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of Industry Applications |
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| Online Access: | https://ieeexplore.ieee.org/document/11034728/ |
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| author | Joel Filipe Guerreiro Tiago Davi Curi Busarello Hildo Guillardi Igor Alves Maronni Jose De A. Olimpio Filho Helmo K. Morales Paredes Jose A. Pomilio |
| author_facet | Joel Filipe Guerreiro Tiago Davi Curi Busarello Hildo Guillardi Igor Alves Maronni Jose De A. Olimpio Filho Helmo K. Morales Paredes Jose A. Pomilio |
| author_sort | Joel Filipe Guerreiro |
| collection | DOAJ |
| description | The grid-connected inverter is responsible for exchanging energy between the electrical grid and energy sources, such as photovoltaic and storage. The interconnection stability of these inverters may be addressed via their impedance characteristics, which comprise the control system and the ac filter. In many cases, the stability deteriorates when these devices are placed in weak grids due to the known effects of phase-locked loop and voltage feedforward. <italic>LCL</italic>-type ac filters and resonant-based controllers also pose challenges to the stability of the operation. This work proposes an approach to impedance shaping to stabilize <italic>LCL</italic>-type grid-connected inverters in nonideal grids with long feeders and disturbing loads. The method relies on regulating the voltage feedforward gain by disturbing and adapting the system based on the distortion of the output current. The technique enables the self-stabilization of the inverter even when an instability is already triggered and without the need for impedance measurements or processor-intensive algorithms. A frequency sweep verification is performed to measure the converter’s impedance and validate it against the theoretical one. An hardware experiment is implemented to evaluate the stability of the converter for large grid impedance variations using the proposed impedance shaping approach. |
| format | Article |
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| institution | Kabale University |
| issn | 2644-1241 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Industry Applications |
| spelling | doaj-art-2e4daa6cfc2a443faf5da4a652078ee02025-08-20T03:28:10ZengIEEEIEEE Open Journal of Industry Applications2644-12412025-01-01636638110.1109/OJIA.2025.357964111034728Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive ControllerJoel Filipe Guerreiro0https://orcid.org/0000-0002-6906-5051Tiago Davi Curi Busarello1https://orcid.org/0000-0002-5406-3811Hildo Guillardi2https://orcid.org/0000-0002-2029-7070Igor Alves Maronni3https://orcid.org/0000-0002-9395-7885Jose De A. Olimpio Filho4https://orcid.org/0000-0003-4866-030XHelmo K. Morales Paredes5https://orcid.org/0000-0001-8664-3573Jose A. Pomilio6https://orcid.org/0000-0001-5457-4438Universidade Estadual de Campinas, Campinas, BrazilDepartment of Control, Automation and Computing Engineering, Federal University of Santa Catarina, Blumenau, BrazilSão Paulo State University (UNESP), School of Engineering of São João da Boa Vista, São João da Boa Vista, BrazilUniversidade Estadual de Campinas, Campinas, BrazilSão Paulo State University (UNESP), Institute of Science and Technology of Sorocaba, Sorocaba, BrazilSão Paulo State University (UNESP), Institute of Science and Technology of Sorocaba, Sorocaba, BrazilUniversidade Estadual de Campinas, Campinas, BrazilThe grid-connected inverter is responsible for exchanging energy between the electrical grid and energy sources, such as photovoltaic and storage. The interconnection stability of these inverters may be addressed via their impedance characteristics, which comprise the control system and the ac filter. In many cases, the stability deteriorates when these devices are placed in weak grids due to the known effects of phase-locked loop and voltage feedforward. <italic>LCL</italic>-type ac filters and resonant-based controllers also pose challenges to the stability of the operation. This work proposes an approach to impedance shaping to stabilize <italic>LCL</italic>-type grid-connected inverters in nonideal grids with long feeders and disturbing loads. The method relies on regulating the voltage feedforward gain by disturbing and adapting the system based on the distortion of the output current. The technique enables the self-stabilization of the inverter even when an instability is already triggered and without the need for impedance measurements or processor-intensive algorithms. A frequency sweep verification is performed to measure the converter’s impedance and validate it against the theoretical one. An hardware experiment is implemented to evaluate the stability of the converter for large grid impedance variations using the proposed impedance shaping approach.https://ieeexplore.ieee.org/document/11034728/Adaptive controllersgrid-connected inverters (GCIs)impedance analysisphase-locked loops (PLLs)small-signal stability |
| spellingShingle | Joel Filipe Guerreiro Tiago Davi Curi Busarello Hildo Guillardi Igor Alves Maronni Jose De A. Olimpio Filho Helmo K. Morales Paredes Jose A. Pomilio Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller IEEE Open Journal of Industry Applications Adaptive controllers grid-connected inverters (GCIs) impedance analysis phase-locked loops (PLLs) small-signal stability |
| title | Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller |
| title_full | Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller |
| title_fullStr | Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller |
| title_full_unstemmed | Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller |
| title_short | Self-Stabilization of Grid-Connected Inverters by Means of an Impedance-Based Adaptive Controller |
| title_sort | self stabilization of grid connected inverters by means of an impedance based adaptive controller |
| topic | Adaptive controllers grid-connected inverters (GCIs) impedance analysis phase-locked loops (PLLs) small-signal stability |
| url | https://ieeexplore.ieee.org/document/11034728/ |
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