A new control strategy of seamless transfer between grid-connected and islanding operation for micro-grid

It is the key problem of the distributed generation technology to realize the seamless switching between the grid and the island operating modes and reduce the current and voltage impulse. This paper introduces the basic topology of micro-grid system and double working mode, -and puts forward a new seamless handoff based on tracking phase and voltage. It can be used to solve the problems of the voltage fluctuation of the micro-grid bus and the current shock, ensure continuity and smoothness of micro grid bus voltage angle in all kinds of mode switching case, lay the foundation for the seamless switching between different operating modes. Finally, the simulation model is established, and the simulation results verify the effectiveness and superiority of the proposed control strategy.