Research on islanding detection for photovoltaic grid-connected inverters

The islanding detection and protection are generally ignored in their applications.For islanding may result in calamities,it is necessary to study and analyze the islanding detection and protection methods.Considering the disadvantages of the traditional over/under voltage and over/under frequency detection,a novel hybrid islanding detection method was proposed by integrating the phase jump detection.The theoretical analysis and model for the proposed detection method was carried out.Finally,the simulation results show that the proposed islanding detection method is effective and practical.