基于频率正反馈双向扰动的孤岛检测方法

Island detection method based on frequency positive feedback two-way disturbance

传统的主动式频移孤岛检测法无法适应负荷性质不断变化的负载,检测盲区较大,导致孤岛检测失败。为提高检测灵活度,提出一种基于频率正反馈双向扰动的孤岛检测方法,能在负载性质不断变化的情况下,检测出光伏并网发电系统的孤岛,实现无盲区检测。同时,与主动频移法相比较,谐波含量减少22%,检测速度提高0.1 s。最后在Matlab/Simulink仿真验证该检测方法的有效性。

The traditional active frequency shift islanding method cannot adapt to the load with changing load characteristics,and the detection blind zone was large,which leads to the failure of island detection.In order to improve the detection flexibility,an island detection method based on two-way perturbation of frequency positive feedback was proposed.It can detect the islands of photovoltaic grid-connected power generation system under the condition of changing load characteristics,and realize blind zone detection.At the same time,compared with the active frequency shift method,the harmonic content was reduced by 22% and the detection speed was increased by 0.1 s.Finally,the effectiveness of the detection method was verified by Matlab/Simulink simulation.