光伏并网逆变器反孤岛检测方法研究

Research on Islanding Detection for Photovoltaic Grid-Connected Inverters

反孤岛效应检测是光伏并网发电系统必须具备的功能,要求既能快速检测孤岛现象,又要尽可能减少对电能质量产生不良影响。文章分析了一般被动和主动孤岛检测技术的基本原理,并指出了各自的优缺点及适应范围,提出了一种电流正反馈扰动孤岛检测方法,该方法消除了传统检测方法的检测盲区,对电能质量影响小,检测快,最后通过仿真证明了其有效性。

Anti—islanding protection is a mandatory feature for grid—connected inerters.A desired islanding detection method can not only detect islanding within acceptable duration,but also have less adverse impact on power quality.This paper analyzes basic principles to passive islanding detection and active islanding detection,and points out application based on advantages and disadvantages.The current positive feedback disturbance method is proposed to solve the problem in the non-detection zone.It is showed that there is little influence on power quality and fast avting.The simulation results verify its effectiveness.