摘要
雷电是光伏发电系统的主要灾害威胁之一,光伏阵列的防雷保护研究非常迫切而重要。建立雷电回击通道传输模型,计算了光伏阵列发生临近雷击时周围电磁场分布。利用电磁感应定律计算光伏阵列回路感应过电压。最后通过建立光伏阵列回路等效电路模型,求解回路承受的短路过电流。计算表明:发生雷击时,电场和磁场强度随雷击点距离的增加而减小。光伏阵列距离雷击点越近,感应过电压幅值越大。光伏阵列回路承受的短路过电流可超过一百安培,极易损坏回路设备和光伏电池板。需要在回路中安装浪涌保护装置,合理泄放雷电能量。
Due to lightning is one of the main factors that cause Photovohaic （PV） systems to fail, study of lightning protection for PV arrays is urgent and important. Lightning return stroke model is established to calculate lightning electromagnetic field. Induced overvoltage in the PV arrays loop is also calculated by law of electromagnetic induction. The equivalent circuit of PV arrays is established to solve short-circuit overcurrent. The results show that： intensity of vertical electric field in near-field decreases with the distance from the discharge channel as well as tangential magnetic field. Overvoltage in the loop increases with decreasing of distance between PV modules and lightning strike point. Short-circuit over- current in the loop may be up to more than one hundred amperes which could easily damage equipment and photovoltaic cells in the loop.It is necessary to install surge protection devices in the loop.
出处
《电瓷避雷器》
CAS
北大核心
2017年第5期145-148,154,共5页
Insulators and Surge Arresters
关键词
光伏阵列
雷电电磁场
感应过电压
回路
PV arrays
lightning electromagnetic field
induced overvoltage
loop
