Method and arrangement for operating a wind turbine converter

It is described a method for operating a converter (100) of a wind turbine for providing electric energy to a utility grid (158), the method comprising: determining a grid voltage (V); if the grid voltage (V) is between a nominal voltage (V0) and a first voltage threshold (V1) higher than the nominal voltage, performing a normal procedure (207) for lowering the grid voltage; if the grid voltage is above the first voltage threshold, performing another procedure (211, 213, 215, 217) for keeping turbine connected, the other procedure being different from the normal procedure. Further a corresponding arrangement is described.