Coordination Control Method and Realization of Micro Grid Synchronized Connection

In recent years, with the large number of renewable energy connected, the problems about intermittence and volatility of renewable energy grid-connected have gradually emerged. Micro grid has flexible and controllable characteristics, that’s the foundation for solving the grid-connected problem of distributed generation, also that’s the inevitable choice to solve the problem that the high proportion of renewable energy connected to the grid. Compared with substations, the requirement for synchronized connection of micro grids has changed greatly. This paper introduces coordination control method of synchronized connection for micro grids and application. It fully considers the characteristics of multi-operation modes and load power fluctuation of micro grids, based on GOOSE (Generic Object Oriented Substation Event) transmission mechanism, it realizes real-time adjustment of voltage and mode switching through controlling energy storage devices. it meets the application requirements of micro grid grid-connected, it also realizes smooth connection of micro grid. The control device based on this method has been successfully applied in the demonstration a national 863 project of Luxi Island Micro grid.