Open AccessResearch on neutral point grounding mode and single-phase earth fault location of medium voltage island microgrid
Author(s) -
Kun Shi,
Yang Tian,
Jing Wu,
Guanhua Li,
Qi Haixing,
Zuojun Geng,
Jianyuan Xu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/605/1/012003
Subject(s) - ground , microgrid , islanding , arc suppression , voltage , fault (geology) , control theory (sociology) , computer science , electromagnetic coil , phase (matter) , electrical engineering , engineering , physics , distributed generation , geology , electric power system , control (management) , power (physics) , quantum mechanics , artificial intelligence , seismology , renewable energy
For medium voltage islanding microgrid, the voltage clamp of the main network neutral arc suppression coil or small resistance is lost. Multiple PTs parallel operation will occur because different entities of a microgrid independently measure the voltage. It is necessary to consider the influence of multi PTs ferroresonance on the neutral grounding mode of islanding microgrid. The neutral point ungrounded, neutral point grounded by arc suppression coil and neutral point grounded by small resistance are analyzed respectively, considering multi PTs ferroresonance and single-phase earth fault location, it is determined that the islanded microgrid adopts neutral point grounded by small resistance. On this basis, the zero sequence current distribution is used to locate the single-phase earth fault. Finally, a simulation example is built to verify the correctness of the proposed method.