Regional Islanding Detection Method of Large-scale Grid-connected Distributed Photovoltaic Power

After large-scale distributed photovoltaic power grid connected, islanding problems become more complex, and there is no good solution yet. In order to resolve this problem, this paper first analyzes existing islanding detection schemes, and analyzes their advantages and disadvantages. Then, this paper proposes a new intelligent regional islanding detection method based on communication, this method has the characteristics of self-adaptive configuration and perfect logical judgment. However, if there is in the absence of communication conditions, the regional control device can detect islanding by load change method. At last, this paper introduces the implementation of the regional islanding detection through the grid-connected interface device and the regional control device. The regional islanding detection proposed in this paper can lay a solid foundation for the widespread promotion of distributed photovoltaic power.