Abstract
Aiming at the problem of safe operation in the medium voltage distribution network with neutral point grounding through small resistance, the distribution network model was built, and on this basis, MW-level photovoltaic (PV) system, doubly fed Induction generator (DFIG) wind turbine, permanent magnet synchronous generator (PMSG) wind turbine and energy storage device was connected respectively in this paper. The ground current and earth potential rise was studied when the power was delivered by mistake. The simulation results show that in the system with neutral point grounding through small resistance, whether it is the traditional or the active distribution network, the three-phase power delivery method is more able to ensure the personal safety of power grid operators. However, The access to distributed generator (DG) in the distribution network will have a greater impact on ground current and earth potential rise in the case of three-phase power delivery. Especially when the ground current and earth potential rise will increase after DG connected to distribution network, which is still likely to pose a threat to personal safety and needs further research.
Highlights
The contribution of this paper is to study the ground current and ground potential rise when the neutral point operates through a small resistance grounding system, and give corresponding suggestions
It can be seen from table 2 and Fig.8 that in the neutral point grounding system through small resistance, in the case of single-phase power delivery between the traditional distribution network and the MW-level distributed generator (DG), the maximum peak ground current reaches more than 27 A, the RMS reaches more than 15 A, and the maximum peak earth potential rise reaches more than 3830 V, the RMS reaches more than 2220 V
The safety operation of 10 kV distribution network with neutral point grounding through small resistance is studied in this paper
Summary
The contribution of this paper is to study the ground current and ground potential rise when the neutral point operates through a small resistance grounding system, and give corresponding suggestions. To study the influence of DG connection on the ground current and ground potential rise is another contribution. The traditional distribution network model is built in this paper. On this basis, the photovoltaic (PV) system, doubly fed induction generator (DFIG), permanent magnet synchronous generator (PMSG) and energy storage devices are connected. The ground current and earth potential rise under singlephase and three-phase power delivery conditions are analyzed quantitatively
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