Analysis of Grounding Grids Connection Between Photovoltaic Farm and Its Substation
Autor: | Yu Guomei, Shi Zhuopeng, Xiaohong Zhang, Dongsheng Xie, Ge Aixin |
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Rok vydání: | 2020 |
Předmět: |
Interconnection
Ground business.industry Computer science 020209 energy Soil resistivity Photovoltaic system Electrical engineering 02 engineering and technology Fault (power engineering) Earthing system Electric power transmission 0202 electrical engineering electronic engineering information engineering business Voltage |
Zdroj: | 2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE). |
DOI: | 10.1109/ichve49031.2020.9280034 |
Popis: | Photovoltaic (PV) farms often surround their supporting substations, which are sometimes built in mountainous regions with high soil resistivity. When the farm and the substation are independently grounded, if there is a fault in the substation, the grounding system of the PV farm will collect most of the fault currents from the substation, which can generate a very high potential difference between the two grounding systems, and give rise to very high step voltages and touch voltages which are hazards to personnel safety and reliable equipment operation. This paper discusses this issue in depth based on numerical simulation of the grounding systems of a PV farm and its 220 kV substation. The grounding resistance, step voltage, touch voltage, and the ground potential difference in the grounding grid are considered, especially in the PV farm. The dangerous place and the mechanism are discussed. The measures to protect the device in the PV farm are investigated. The research finds that if the two grounding system are interconnected, all of the parameters decrease greatly. Therefore, interconnection two grounding system is necessary even they belong to different companies. |
Databáze: | OpenAIRE |
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