Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms
Doubly fed induction generator (DFIG) based wind farms are being increasingly integrated into power grids with transmission lines, and distance protection is usually used as either the main or the backup protection for the transmission line. This paper analyzes the composition of a DFIG short circui...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-04-01
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| Series: | Applied Sciences |
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| Online Access: | http://www.mdpi.com/2076-3417/8/4/562 |
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| author | Bin Li Junyu Liu Xin Wang Lili Zhao |
| author_facet | Bin Li Junyu Liu Xin Wang Lili Zhao |
| author_sort | Bin Li |
| collection | DOAJ |
| description | Doubly fed induction generator (DFIG) based wind farms are being increasingly integrated into power grids with transmission lines, and distance protection is usually used as either the main or the backup protection for the transmission line. This paper analyzes the composition of a DFIG short circuit current and indicates the existence of a rotor speed frequency component. By analyzing several real fault cases of the DFIG-based wind farms connected to transmission lines, the weak power supply system and current frequency deviation of the wind farm side are illustrated. When a fault occurs on the transmission line, the short circuit current on the wind farm side is small and its frequency may no longer be nominal due to the existence of rotor speed frequency component, whereas the voltage frequency remains nominal frequency because of the grid support. As a result, the conventional distance protection cannot accurately measure the impedance, which can result in unnecessary circuit breaker tripping. Therefore, a time-domain distance protection method combined with the least-squares algorithm is proposed to address the problem. The efficacy of the proposed method is validated with real fault cases and simulation. |
| first_indexed | 2024-12-23T13:15:15Z |
| format | Article |
| id | doaj.art-cb3582b183c843f7b32629d32352c13c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-23T13:15:15Z |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-cb3582b183c843f7b32629d32352c13c2022-12-21T17:45:37ZengMDPI AGApplied Sciences2076-34172018-04-018456210.3390/app8040562app8040562Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind FarmsBin Li0Junyu Liu1Xin Wang2Lili Zhao3Smart Grid Key Laboratory of Ministry of Education, Tianjin University, Tianjin 300072, ChinaSmart Grid Key Laboratory of Ministry of Education, Tianjin University, Tianjin 300072, ChinaMaintenance Company of Tianjin Electric Power Company, Tianjin 300250, ChinaElectric Power Dispatching Control Center of Guizhou Power Grid Company, Guiyang 550002, ChinaDoubly fed induction generator (DFIG) based wind farms are being increasingly integrated into power grids with transmission lines, and distance protection is usually used as either the main or the backup protection for the transmission line. This paper analyzes the composition of a DFIG short circuit current and indicates the existence of a rotor speed frequency component. By analyzing several real fault cases of the DFIG-based wind farms connected to transmission lines, the weak power supply system and current frequency deviation of the wind farm side are illustrated. When a fault occurs on the transmission line, the short circuit current on the wind farm side is small and its frequency may no longer be nominal due to the existence of rotor speed frequency component, whereas the voltage frequency remains nominal frequency because of the grid support. As a result, the conventional distance protection cannot accurately measure the impedance, which can result in unnecessary circuit breaker tripping. Therefore, a time-domain distance protection method combined with the least-squares algorithm is proposed to address the problem. The efficacy of the proposed method is validated with real fault cases and simulation.http://www.mdpi.com/2076-3417/8/4/562DFIG-based wind farmtransmission linereal fault casesfault characteristicsdistance protection |
| spellingShingle | Bin Li Junyu Liu Xin Wang Lili Zhao Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms Applied Sciences DFIG-based wind farm transmission line real fault cases fault characteristics distance protection |
| title | Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms |
| title_full | Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms |
| title_fullStr | Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms |
| title_full_unstemmed | Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms |
| title_short | Fault Studies and Distance Protection of Transmission Lines Connected to DFIG-Based Wind Farms |
| title_sort | fault studies and distance protection of transmission lines connected to dfig based wind farms |
| topic | DFIG-based wind farm transmission line real fault cases fault characteristics distance protection |
| url | http://www.mdpi.com/2076-3417/8/4/562 |
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