基于综合阻抗的孤岛检测新方法

The grid-connected system of single-pole photovoltaic inverter is taken as the research object, the concept of impedance is expanded, and a passive islanding detection method based on the common coupling point (PCC) comprehensive impedance is proposed. The real-time signals of voltage and current are extracted by fast Fourier transform. By identifying the change state of the comprehensive impedance at the PCC point, the phenomenon of normal and isolated island is distinguished. The simulation results show that the isolated island detection method can quickly and effectively detect the isolated island, and does not affect the output power quality of the inverter.