A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids
A microgrid (MG) may lose its grounding provided by the main distribution grid in islanded mode, which could cause equipment insulation damage, hazards to personnel, and protection malfunction. Existing MG grounding schemes include the grounding transformer-based scheme and distributed energy resour...
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IEEE
2024-01-01
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| Series: | IEEE Open Access Journal of Power and Energy |
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| Online Access: | https://ieeexplore.ieee.org/document/10478910/ |
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| author | Dingrui Li Yiwei Ma Yu Su Chengwen Zhang Lin Zhu He Yin Fred Wang Leon M. Tolbert |
| author_facet | Dingrui Li Yiwei Ma Yu Su Chengwen Zhang Lin Zhu He Yin Fred Wang Leon M. Tolbert |
| author_sort | Dingrui Li |
| collection | DOAJ |
| description | A microgrid (MG) may lose its grounding provided by the main distribution grid in islanded mode, which could cause equipment insulation damage, hazards to personnel, and protection malfunction. Existing MG grounding schemes include the grounding transformer-based scheme and distributed energy resource (DER) transformer-based scheme. However, the grounding transformer-based scheme will increase MG’s cost, and the DER transformer approach will affect the main grid in the grid-connected mode. Moreover, future MGs may have multiple source locations. In each source location, the source and critical load can potentially operate as a sub-MG, requiring a grounding when it stands alone. In this scenario, the drawbacks of existing grounding schemes will be further magnified. In this paper, a novel controllable DER transformer-based grounding scheme is proposed, where a controllable switch is added to the neutral wire of the transformer. The proposed scheme can disable grounding capability in the grid-connected mode and enable it in the islanded mode by changing the transformer connection. The proposed approach can avoid impacts on the main distribution grid and eliminate the need for additional transformers. The design methodology of the proposed grounding scheme is provided. Simulation verification is conducted on a realistic MG model and experimental verification is conducted. |
| format | Article |
| id | doaj-art-579e7ee6ea414e86a7a37f87983ab7a1 |
| institution | Kabale University |
| issn | 2687-7910 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Access Journal of Power and Energy |
| spelling | doaj-art-579e7ee6ea414e86a7a37f87983ab7a12025-01-21T00:03:14ZengIEEEIEEE Open Access Journal of Power and Energy2687-79102024-01-011116517710.1109/OAJPE.2024.338160910478910A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for MicrogridsDingrui Li0https://orcid.org/0000-0002-4651-1602Yiwei Ma1https://orcid.org/0000-0001-6465-313XYu Su2https://orcid.org/0000-0002-2364-8702Chengwen Zhang3https://orcid.org/0000-0002-4665-6385Lin Zhu4https://orcid.org/0000-0002-9849-6010He Yin5https://orcid.org/0000-0002-4924-3543Fred Wang6https://orcid.org/0000-0002-2133-9199Leon M. Tolbert7https://orcid.org/0000-0002-7285-609XDepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USADepartment of Electrical Engineering and Computer Science, The University of Tennessee at Knoxville, Knoxville, TN, USAA microgrid (MG) may lose its grounding provided by the main distribution grid in islanded mode, which could cause equipment insulation damage, hazards to personnel, and protection malfunction. Existing MG grounding schemes include the grounding transformer-based scheme and distributed energy resource (DER) transformer-based scheme. However, the grounding transformer-based scheme will increase MG’s cost, and the DER transformer approach will affect the main grid in the grid-connected mode. Moreover, future MGs may have multiple source locations. In each source location, the source and critical load can potentially operate as a sub-MG, requiring a grounding when it stands alone. In this scenario, the drawbacks of existing grounding schemes will be further magnified. In this paper, a novel controllable DER transformer-based grounding scheme is proposed, where a controllable switch is added to the neutral wire of the transformer. The proposed scheme can disable grounding capability in the grid-connected mode and enable it in the islanded mode by changing the transformer connection. The proposed approach can avoid impacts on the main distribution grid and eliminate the need for additional transformers. The design methodology of the proposed grounding scheme is provided. Simulation verification is conducted on a realistic MG model and experimental verification is conducted.https://ieeexplore.ieee.org/document/10478910/Microgridgrounding schemedistributed energy resourcescontrollable transformer |
| spellingShingle | Dingrui Li Yiwei Ma Yu Su Chengwen Zhang Lin Zhu He Yin Fred Wang Leon M. Tolbert A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids IEEE Open Access Journal of Power and Energy Microgrid grounding scheme distributed energy resources controllable transformer |
| title | A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids |
| title_full | A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids |
| title_fullStr | A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids |
| title_full_unstemmed | A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids |
| title_short | A Controllable Distributed Energy Resource Transformer-Based Grounding Scheme for Microgrids |
| title_sort | controllable distributed energy resource transformer based grounding scheme for microgrids |
| topic | Microgrid grounding scheme distributed energy resources controllable transformer |
| url | https://ieeexplore.ieee.org/document/10478910/ |
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