大规模分布式光伏接入配电系统雷击过电压特性分析OA

In view of the lightning transient overvoltage problem after the large-scale distributed photo-voltaic access to the distribution system,the typical distributed photovoltaic system in Nanjing Lishui area was selected as the research object.According to the actual structure and parameters of the photovoltaic system and 10 kV distribution line,the construction methods of photovoltaic cell array,inverter and con-trol system and other key modules were proposed.The calculation model of lightning overvoltage consider-ing photovoltaic system and distribution line was established.Under the conditions of lightning striking the distribution line side and photovoltaic side,the variation of overvoltage on the distribution line side,photovoltaic grid-connected access point and inverter DC side was calculated.The results show that when the lightning point is located in the distribution line of the 1-2 level tower near the grid-connec-tion access point,the intrusion overvoltage wave has a great influence on the photovoltaic system,which is easy to cause the photovoltaic module to be damaged.When the lightning point is located at the grid-connected access point,it has a greater impact on the distribution line.The research can provide a refer-ence for lightning protection under the background of distributed photovoltaic large-scale access to the distribution network.