光伏并网孤岛效应产生特性与控制

Control and principle of islanding effect of photovoltaic grid-connected

基于光伏发电系统并网中产生的孤岛效应问题,从原理上进行了探讨.比较了检测孤岛效应的几种方法,针对孤岛检测方法中的检测盲点,提出了一种基于频率微小变化的功率平衡的孤岛检测方法.在Matlab/Simulink的环境下,对其进行了建模仿真研究,该方法具有检测孤岛无盲区、响应速度快、对光伏并网发电系统有功输出无影响的特点,并验证了采用这种孤岛检测方法的可行性.

The islanding problem in grid-connected photoltaics system was analyzed and several methods of detecting islanding effect were compared.There was non-detecting zone problem in the conventional methods of islanding detection,and the islanding detection method based on the power balance of small changes frequence was proposed.This method has the advantages of no undetected zone,high response speed and no influence on the output active power of the system.The simulation results by Matlab/Simulink show the method is effective.