A Novel Islanding Detection Method for Photovoltaic Grid Connected System

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Huang, Xiaobo^1 ; Xia, Fei^1 ; Xia, Zongze^1 ; Cong, Peixian^1 ; Di, Zhuo^1 ; Yang, Zhixiong^2 ; Song, Li^1

State Grid Liaoyang Electric Power Supply Company, Liaoyang

111000, China^1

Kunming Institute of Physics, Kunming

650223, China^2

关键词: Active frequency drifts;    Control methods;    Islanding detection methods;    Load condition;    Output voltages;    Periodic perturbation;    Photovoltaic grid connected system;    Power grids;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/4/042142/pdf
DOI  :  10.1088/1755-1315/170/4/042142

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

It is very important to detect islanding effect timely and accurately in the case of power grid failure. Therefore, a new periodic perturbation positive feedback active frequency drift method is proposed in this paper. When the power grid fails, the inverter output voltage frequency always has obvious change under the different load of inverter, and the islanding effect can be detected quickly and accurately by this control method. Experimental results show that the proposed method can detect grid faults quickly and accurately under different load conditions.