Patent ID: 8552577
Filing Date: 2013-10-08
Classification: F03D,H02H,Y02E

Abstract:
1. A wind-power generation system with an over-speed protection providing a wind turbine to convert wind energy into mechanical energy, the wind turbine driving a generator to convert the mechanical energy into electric energy, the electric energy delivered to a power grid to provide a grid connection between the wind-power generation system and the power grid; the wind-power generation system comprising: an AC crowbar electrically connected to the generator; a fuse electrically connected to the AC crowbar and the generator; a generator-side converter electrically connected to the fuse to provide an AC-to-DC conversion of electric energy; a DC chopper electrically connected to the generator-side converter; a grid-side converter electrically connected to the DC chopper to provide a DC-to-AC conversion of electric energy; a grid-connected filter electrically connected to the grid-side converter to filter electric energy; and a transformer electrically connected to the grid-connected filter and the power grid to convert a voltage level of the electric energy of the grid connection between the wind-power generation system and the power grid; wherein the AC crowbar or the DC chopper is provided to consume superfluous energy outputted from the generator, thus providing an over-load operation to brake the wind turbine when the wind turbine operates under a first stage over-speed operation; the generator is isolated from the generator-side converter by disconnecting the fuse when the wind turbine operates under a second stage over-speed operation.