Research on Collaborative System of Anti-Island Safety Protection Equipment for Large-Scale Distributed Photovoltaic Connected to Distribution Network

In this paper, an anti-islanding scheme using adaptive load based on photovoltaic grid-connection is proposed. In order to minimize the investment of the system, this project intends to adopt a new generation of distributed photovoltaic access technology and anti-island equipment to implement. Then the overall structure and functional structure of the anti-islanding detection system are described in detail. The passive inverse island without dead zone is realized by automatic switching of load. Its biggest feature lies in the realization of "anti-island" on the grid interface. Two methods, active and passive, are adopted to achieve the purpose of design. The proposed method is simulated by using PSCAD software, and the results show that the method is feasible. In addition, this project is based on a new generation of distributed photovoltaic access system, which can be applied in the field. This saves money and facilitates the installation and maintenance of on-site equipment.