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| Analysis of single-phase grounding fault characteristics of low resistance grounding systemwith multi-distributed power supply |
| DOI：10.19783/j.cnki.pspc.231515 |
| Key Words:distributed power system single-phase grounding fault distribution network through low resistance grounding mode fault current transformer grounding mode |
| Author Name | Affiliation | | TIAN Junyang1 | 1. Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China
2. College of New Energy,
China University of Petroleum (East China), Qingdao 266580, China | | LI Haiyong1 | 1. Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China
2. College of New Energy,
China University of Petroleum (East China), Qingdao 266580, China | | JIANG Liandian1 | 1. Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China
2. College of New Energy,
China University of Petroleum (East China), Qingdao 266580, China | | SHEN Zizheng1 | 1. Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China
2. College of New Energy,
China University of Petroleum (East China), Qingdao 266580, China | | REN Haolin2 | 1. Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China
2. College of New Energy,
China University of Petroleum (East China), Qingdao 266580, China | | GUO Liwei2 | 1. Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China
2. College of New Energy,
China University of Petroleum (East China), Qingdao 266580, China |
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| Abstract:The single-phase grounding fault characteristics of the distribution network system via low resistance grounding mode will be affected by the grounding mode adopted by different types of grid-connected DGs. Aiming at the problem, combined with the symmetrical component method, a single-phase grounding fault analysis model of distribution network with multiple grid-connected DGs having different types and grounding modes is established first. The single-phase grounding fault point current of the system and the three-sequence current of the line are analyzed afterwards. Finally, the simulation model of single-phase ground fault is built by Matlab/Simulink, which verifies the correctness of the analysis of fault current characteristics. The results show that the grid-connected DG being ungrounded has the least impact on the system fault characteristics. This provides a theoretical basis for the selection of the type of grid-connected DG and the grounding mode of the grid-connected transformer. |
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