Grid-connected and connected to the Internet mean the same thing, both refer to wind power being fed into the grid.
However, wind power generation is alternating current with unstable voltage and frequency. If it is to be integrated into the power grid, a wind turbine converter device is required. To put it simply, it is a frequency stabilizing and voltage stabilizing device connected between the wind turbine and the power grid. Between the power grids, it ensures the power quality of wind power grid connection and ensures safer and more reliable operation of the power grid.