Abstract: An output filter for a power conversion system having a plurality of power converters connected in parallel, the output filter including a magnetic core and a plurality of filtering windings each wound around a corresponding one of a plurality of segments of the magnetic core and corresponding to one of the plurality of power converters, each of the plurality of filtering windings including a free-end configured for connection to an output of a corresponding one of the plurality of power converters and a second end, the second ends of all of the filtering windings being electrically connected to each other in a common connection; at least one additional winding wound around the additional segment of the magnetic core, the additional winding having a free-end for being connected to an electrical grid and a second end connected to the common connection.

Abstract: An output filter for a power conversion system having a plurality of power converters connected in parallel, the output filter including a magnetic core and a plurality of filtering windings each wound around a corresponding one of a plurality of segments of the magnetic core and corresponding to one of the plurality of power converters, each of the plurality of filtering windings including a free-end configured for connection to an output of a corresponding one of the plurality of power converters and a second end, the second ends of all of the filtering windings being electrically connected to each other in a common connection; at least one additional winding wound around the additional segment of the magnetic core, the additional winding having a free-end for being connected to an electrical grid and a second end connected to the common connection.

Abstract: A kit for a wind station having a fixed speed wind turbine with a generator configured to be coupled to a grid by a coupling device so that the turbine operates at a fixed frequency equal to the frequency of the grid. The kit includes a back-to-back power converter configured for connection between the generator and the grid, and the power converter includes a machine side converter, a grid side converter and a DC link between both converters, a controller for controlling the power converter, and a connection point for receiving at least one parameter of the generator of the turbine. The connection point is communicated with the controller, and the controller is configured to act upon the power controller depending on said parameter.

Abstract: Kit and method for a wind station comprising a fixed speed wind turbine with a generator being coupled to a grid by means of a coupling device so that the turbine operates at a fixed grid current frequency of the grid. The kit (100) is adapted to be coupled between the generator (10) of the wind turbine (1) and the grid (2), replacing at least the coupling device, the kit (100) turning the fixed speed wind turbine into a variable speed wind turbine.