Method for operating a frequency converter of a generator and wind energy turbine having a generator operated according to the method
AssigneeGeneral Electric Company
InventorsWerner Barton, Andreas Buecker
Life of this patent
Estimating the term…
Abstract
The method for operating a frequency converter (26) of a generator (14) in particular of a wind energy turbine (10), in the event of a substantial grid voltage drop, wherein the frequency converter (26) comprises a generator-side power converter (32), to be connected to the generator (14), a grid-side power converter (28) to be connected to the voltage grid (18), and a DC link circuit (30) for connecting the generator-side power converter (32) to the grid-side power converter (28), comprises the step of generating the amount of reactive current to be supplied to the grid (18) by controlling the frequency converter (26).
Claims24
Method for operating a frequency converter (26,26′,26″) of a generator (14,14′,14″), in the event of a substantial grid voltage drop in a grid, wherein the frequency converter (26,26′,26″) comprises a generator-side power converter (32,32′,32″), to be connected to the generator (14,14′,14″), a grid-side power converter (28,28′,28″) to be connected to the grid (18,18′,18″), and a DC link circuit (30,30′,30″) for connecting the generator-side power converter (32,32′,32″) to the grid-side power converter (28,28′,28″), the method comprising the step of
- generating an amount of reactive current to be supplied to the grid (18,18′,18″) by controlling the frequency converter (26,26′,26″) so as to generate reactive current.
Method for operating a frequency converter (26,26′,26″) of a generator (14,14′,14″) under substantially normal grid condition and with the generator (14,14′,14″) not being in its operating state, wherein the frequency converter (26,26′,26″) comprises a generator-side power converter (32,32′,32″), to be connected to the generator (14,14′,14″), a grid-side power converter (28,28′,28″) to be connected to the voltage grid (18,18′,18″), and a DC link circuit (30,30′,30″) for connecting the generator-side power converter (32,32′,32″) to the grid-side power converter (28,28′,28″), the method comprising the step of
- controlling an amount of reactive current to be supplied to the grid (18,18′,18″) by controlling the grid-side power converter (28,28′,28″).
Wind energy turbine (10,10′,10″) for generating power to be supplied to a grid (18,18′,18″), comprising
- a rotor (12,12′12″),
- a generator (14,14′,14″) operatively connected to the rotor (12,12′,12″),
- a frequency converter (26,26′,26″) electrically connectable to the generator (14,14′,14″) and the grid (18,18′,18″) and comprising a generator-side power converter (32,32′,32″) operatively connectable to the generator (14,14′,14″), a grid-side power converter (28,28′,28″) operatively connectable to the grid (18,18′,18″), and a DC link circuit (30,30′,30″) for connecting the generator-side power converter (32,32′,32″) to the grid-side power converter (28,28′,28″), and
- a control unit (38,38′,38″) for controlling the frequency converter (26,26′,26″) for generating reactive current to be supplied to the grid,
- wherein in the event of a substantial grid voltage drop, the control unit (38,38′,38″) controls the frequency converter (26,26′,26″) for generating an amount of reactive current to be supplied to the grid (18,18′,18″).
Wind energy turbine for generating power to be supplied to a grid, comprising
- a rotor (12,12′,12″),
- a generator (14,14′,14″) operatively connected to the rotor (12,12′,12″),
- a frequency converter (26,26′,26″) electrically connectable to the generator (14,14′,14″) and the grid (18,18′,18″) and comprising a generator-side power converter (32,32′,32″) operatively connectable to the generator (14,14′,14″), a grid-side power converter (28,28′,28″) operatively connectable to the grid (18,18′,18,18″), and a DC link circuit (30,30′,30″) for connecting the generator-side power converter (32,32′,32″) to the grid-side power converter (28,28′,28″), and
- a control unit (38,38′,38″) for controlling the frequency converter (26,26′,26″) for generating reactive current to be supplied to the grid (18,18′,18″),
- wherein under normal grid condition but with the generator (14,14′,14″) not in its operating state, the control unit (38,38′,38″) controls the grid-side power converter (28,28′,28″) of the frequency converter (26,26′,26″) for controlling an amount of reactive current to be supplied to the grid (18,18′,18″).
Dependencies are inferred from the claim text.