Challenges in Microgrids with Medium Voltage Circuit
This paper presents and discusses challenges in microgrids (uGrid) that arise when they operate isolated from the main grid. Specifically, these challenges occur because the system becomes an ungrounded delta configuration, and the microgrid power sources exhibit low short-circuit capacity. The imp...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Eletrônica de Potência
2025-01-01
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| Series: | Eletrônica de Potência |
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| Online Access: | https://journal.sobraep.org.br/index.php/rep/article/view/996 |
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| author | Hércules A. Oliveira Luiza H. S. Santos Luiz A. de S. Ribeiro José G. de Matos Lucas de P. A. Pinheiro |
| author_facet | Hércules A. Oliveira Luiza H. S. Santos Luiz A. de S. Ribeiro José G. de Matos Lucas de P. A. Pinheiro |
| author_sort | Hércules A. Oliveira |
| collection | DOAJ |
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This paper presents and discusses challenges in microgrids (uGrid) that arise when they operate isolated from the main grid. Specifically, these challenges occur because the system becomes an ungrounded delta configuration, and the microgrid power sources exhibit low short-circuit capacity. The important issues addressed include the failure to detect ground overcurrent during an earth fault event, voltage imbalances recorded by voltage transformers (VTs) connected between phases and earth, and the phenomenon of ferroresonance. These issues directly impact the coordination of electrical protection, component integrity, and synchronization checks between different power sources within the uGrid. Therefore, the Energy Management System (EMS) is tasked with managing protection devices and systematically responding to minimize disruptions, thereby ensuring operational security. This paper examines the protection functions within devices for both operational modes (on-grid and off-grid) and the corresponding decisions implemented as rules within the EMS. Effective coordination between protection devices and management systems ensures a rapid and selective response to faults, thereby enhancing microgrid security and facilitating efficient problem detection and resolution.
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| format | Article |
| id | doaj-art-4bbf887a52ae4b6e8846445bb7e9fec0 |
| institution | Kabale University |
| issn | 1414-8862 1984-557X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Associação Brasileira de Eletrônica de Potência |
| record_format | Article |
| series | Eletrônica de Potência |
| spelling | doaj-art-4bbf887a52ae4b6e8846445bb7e9fec02025-01-23T19:06:37ZengAssociação Brasileira de Eletrônica de PotênciaEletrônica de Potência1414-88621984-557X2025-01-013010.18618/REP.e202511Challenges in Microgrids with Medium Voltage CircuitHércules A. Oliveira0https://orcid.org/0000-0002-7427-5694Luiza H. S. Santos1https://orcid.org/0000-0001-5397-9871Luiz A. de S. Ribeiro2https://orcid.org/0000-0001-8477-8546José G. de Matos3https://orcid.org/0000-0001-5340-6459Lucas de P. A. Pinheiro4https://orcid.org/0000-0002-4641-3703Universidade Federal do Maranhão Universidade Estadual de Campinas (UNICAMP) Universidade Federal do Maranhão Universidade Federal do MaranhãoInstitute of Science and Technology Grupo Equatorial This paper presents and discusses challenges in microgrids (uGrid) that arise when they operate isolated from the main grid. Specifically, these challenges occur because the system becomes an ungrounded delta configuration, and the microgrid power sources exhibit low short-circuit capacity. The important issues addressed include the failure to detect ground overcurrent during an earth fault event, voltage imbalances recorded by voltage transformers (VTs) connected between phases and earth, and the phenomenon of ferroresonance. These issues directly impact the coordination of electrical protection, component integrity, and synchronization checks between different power sources within the uGrid. Therefore, the Energy Management System (EMS) is tasked with managing protection devices and systematically responding to minimize disruptions, thereby ensuring operational security. This paper examines the protection functions within devices for both operational modes (on-grid and off-grid) and the corresponding decisions implemented as rules within the EMS. Effective coordination between protection devices and management systems ensures a rapid and selective response to faults, thereby enhancing microgrid security and facilitating efficient problem detection and resolution. https://journal.sobraep.org.br/index.php/rep/article/view/996microgridmedium voltageferroresonanceungrounded system |
| spellingShingle | Hércules A. Oliveira Luiza H. S. Santos Luiz A. de S. Ribeiro José G. de Matos Lucas de P. A. Pinheiro Challenges in Microgrids with Medium Voltage Circuit Eletrônica de Potência microgrid medium voltage ferroresonance ungrounded system |
| title | Challenges in Microgrids with Medium Voltage Circuit |
| title_full | Challenges in Microgrids with Medium Voltage Circuit |
| title_fullStr | Challenges in Microgrids with Medium Voltage Circuit |
| title_full_unstemmed | Challenges in Microgrids with Medium Voltage Circuit |
| title_short | Challenges in Microgrids with Medium Voltage Circuit |
| title_sort | challenges in microgrids with medium voltage circuit |
| topic | microgrid medium voltage ferroresonance ungrounded system |
| url | https://journal.sobraep.org.br/index.php/rep/article/view/996 |
| work_keys_str_mv | AT herculesaoliveira challengesinmicrogridswithmediumvoltagecircuit AT luizahssantos challengesinmicrogridswithmediumvoltagecircuit AT luizadesribeiro challengesinmicrogridswithmediumvoltagecircuit AT josegdematos challengesinmicrogridswithmediumvoltagecircuit AT lucasdepapinheiro challengesinmicrogridswithmediumvoltagecircuit |