Modeling and analysis of interactions in grid-forming inverter systems
| dc.contributor.author | Muthukumarana Hewa Thondilege, Theja Thilekha | |
| dc.contributor.examiningcommittee | Karawita, Chandana (Electrical and Computer Engineering) | |
| dc.contributor.examiningcommittee | Muthumuni, Dharshana (Electrical and Computer Engineering) | |
| dc.contributor.examiningcommittee | Knight, Andy (Electrical and Software Engineering, University of Calgary) | |
| dc.contributor.supervisor | Filizadeh, Shaahin | |
| dc.contributor.supervisor | Annakkage, Udaya | |
| dc.date.accessioned | 2025-03-05T16:20:17Z | |
| dc.date.available | 2025-03-05T16:20:17Z | |
| dc.date.issued | 2025-03-05 | |
| dc.date.submitted | 2025-03-05T02:50:57Z | en_US |
| dc.date.submitted | 2025-03-05T16:13:12Z | en_US |
| dc.degree.discipline | Electrical and Computer Engineering | |
| dc.degree.level | Doctor of Philosophy (Ph.D.) | |
| dc.description.abstract | The grid-forming (GFM) concept is an inverter control method that deploys the inverter’s power modulations to regulate the system voltage and frequency. A variety of GFM controller topologies can be found in the literature. Mainly a GFM controller consists of a layer that mimics synchronous machine characteristics and a current-limiting loop. Depending on the controller topology and parameters, a GFM inverter’s dynamics can spread over a wide bandwidth leading to a wide range of interactions. The full disclosure of the root causes of interactions that can be excited by a GFM inverter is still lacking in the literature. Therefore, in this research small-signal, model-based eigenvalue analysis is conducted on commonly-used GFM controller topologies with different ac- and dc-side system configurations to reveal the full causes of interactions that can happen in a GFM inverter system. The virtual electromechanical interaction between GFM inverters and other GFM inverters and synchronous machines, high-frequency network interactions, and interactions between the dc-side circuitry and GFM controller, LC filter components, and the governor-turbine of synchronous machines are revealed and verified by PSCAD/EMTDC simulations. This comprehensive analysis unfolds the main driving factors behind the critical interactions in GFM inverter systems and proposes effective mitigation methods. | |
| dc.description.note | May 2025 | |
| dc.description.sponsorship | University of Manitoba MITACS Manitoba Hydro International | |
| dc.identifier.uri | http://hdl.handle.net/1993/38901 | |
| dc.language.iso | eng | |
| dc.subject | Grid-froming inverters | |
| dc.subject | small-signal stability | |
| dc.title | Modeling and analysis of interactions in grid-forming inverter systems | |
| local.subject.manitoba | no | |
| project.funder.name | Natural Sciences and Engineering Research Council of Canada |