摘要
孤岛效应是分布式发电系统中存在的一个基本问题。如何快速可靠地判断出孤岛是分布式发电并网的难点之一,尤其是在逆变器输出功率与负载功率平衡时。此处研究了一种基于高频信号扰动的孤岛检测方法,根据孤岛前后公共耦合点(PCC)处阻抗大小的变化进行孤岛检测。该方法属于主动式检测法,不存在不可检测区域,对电能质量仅有微小影响。实验结果证明了该方法的准确性及可靠性。
Islanding detection is one of the common issues for distributed generation systems connected to an electric power grid.It is difficult to detect islanding in distributed generation research, especially when power balance between the output of inverter and the load.A method for islanding detection is proposed which based on high frequency signal disturbance.The islanding detection is based on the value of grid impedance before and after islanding in point of common coupling（PCC）.The bad effects on the grid power quality due to injecting harmonic components is negligible. The experimental results verify the accuracy and reliability of the method.
出处
《电力电子技术》
CSCD
北大核心
2013年第3期70-72,共3页
Power Electronics
关键词
孤岛检测
光伏并网
电网阻抗检测
高频扰动
islanding detection
photovoltaic grid-connected
grid impedance detection
high frequency disturbance
