In recent years

with the rapid development of micro-grid and grid-connection

the parallel operation between each grid is the general trend and therefore the grid-connection technology is getting much attention.In this paper

a kind of flexible interconnected device for the grid connection operation between the micro-grids and between the micro grid and big power grid.In this paper

the topological structure

working principle and function advantage of the device are introduced firstly

then

the existing control strategy is analyzed and a kind of current vector control strategy and operation mode with PI control as the base is proposed.Finally

the simulation model of the flexible interconnection device is set up on the RTDS system.It is proved by the test that in case of parallel operation

the device can realize the connection of multiple nonsync hronous power grid and the impaction is small

the direction and magnitude of power flow is flexible and has the function of reactive compensation with good isolation to improve the quality of power grid.