Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference
Abstract Fast and reliable short fault detection is one of the key technologies in the development of DC multi‐microgrids (MMG). In order to improve the speed and reliability of DC relay protection, especially to solve the problem of protection failure in high impedance short‐circuit, a fault criter...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-08-01
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| Series: | IET Power Electronics |
| Online Access: | https://doi.org/10.1049/pel2.12282 |
| _version_ | 1818110410485661696 |
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| author | Weiliang Zhang Hui Zhang Na Zhi Hanwei Wang Cheng Zeng |
| author_facet | Weiliang Zhang Hui Zhang Na Zhi Hanwei Wang Cheng Zeng |
| author_sort | Weiliang Zhang |
| collection | DOAJ |
| description | Abstract Fast and reliable short fault detection is one of the key technologies in the development of DC multi‐microgrids (MMG). In order to improve the speed and reliability of DC relay protection, especially to solve the problem of protection failure in high impedance short‐circuit, a fault criterion based on the gradient of the branch admittance differential is proposed. The branch admittance is the quotient of current and voltage. It makes effective use of the characteristics of the fault current and voltage, so it has higher sensitivity. By detecting the current and voltage at the two sides of the branch, the admittance differential gradient of the branch is calculated and used as the fault criterion. In case of normal operation or fault outside the protection zone, the differential admittance gradient of the branch is zero, and in case of fault inside the protection zone, the admittance differential gradient of the branch is greater than zero regardless of high impedance or low impedance short‐circuit. Meanwhile, the admittance difference gradient is the largest at the beginning of the fault. Therefore, the detection time is reduced. Finally, the experimental results confirm the effectiveness of the proposed strategy. |
| first_indexed | 2024-12-11T02:46:42Z |
| format | Article |
| id | doaj.art-dff445131c6b464284815b12c73d1acd |
| institution | Directory Open Access Journal |
| issn | 1755-4535 1755-4543 |
| language | English |
| last_indexed | 2024-12-11T02:46:42Z |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Power Electronics |
| spelling | doaj.art-dff445131c6b464284815b12c73d1acd2022-12-22T01:23:24ZengWileyIET Power Electronics1755-45351755-45432022-08-01151096397710.1049/pel2.12282Protection strategy for DC multi‐microgrids based on gradient of branch admittance differenceWeiliang Zhang0Hui Zhang1Na Zhi2Hanwei Wang3Cheng Zeng4School of Electrical Engineering Xi'an University of Technology Xi'an ChinaSchool of Electrical Engineering Xi'an University of Technology Xi'an ChinaSchool of Electrical Engineering Xi'an University of Technology Xi'an ChinaSchool of Electrical Engineering Xi'an University of Technology Xi'an ChinaSchool of Electrical Engineering Xi'an University of Technology Xi'an ChinaAbstract Fast and reliable short fault detection is one of the key technologies in the development of DC multi‐microgrids (MMG). In order to improve the speed and reliability of DC relay protection, especially to solve the problem of protection failure in high impedance short‐circuit, a fault criterion based on the gradient of the branch admittance differential is proposed. The branch admittance is the quotient of current and voltage. It makes effective use of the characteristics of the fault current and voltage, so it has higher sensitivity. By detecting the current and voltage at the two sides of the branch, the admittance differential gradient of the branch is calculated and used as the fault criterion. In case of normal operation or fault outside the protection zone, the differential admittance gradient of the branch is zero, and in case of fault inside the protection zone, the admittance differential gradient of the branch is greater than zero regardless of high impedance or low impedance short‐circuit. Meanwhile, the admittance difference gradient is the largest at the beginning of the fault. Therefore, the detection time is reduced. Finally, the experimental results confirm the effectiveness of the proposed strategy.https://doi.org/10.1049/pel2.12282 |
| spellingShingle | Weiliang Zhang Hui Zhang Na Zhi Hanwei Wang Cheng Zeng Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference IET Power Electronics |
| title | Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference |
| title_full | Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference |
| title_fullStr | Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference |
| title_full_unstemmed | Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference |
| title_short | Protection strategy for DC multi‐microgrids based on gradient of branch admittance difference |
| title_sort | protection strategy for dc multi microgrids based on gradient of branch admittance difference |
| url | https://doi.org/10.1049/pel2.12282 |
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