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US 12,088,236 B2Granted
Control of an induction generator of a wind turbine
AssigneeSiemens Gamesa Renewable Energy Innovation & Technology S.L.
InventorsMiguel Ángel Sepúlveda Gonzalez, Mikel Tapia Pascal
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Abstract
A method of controlling an induction generator is provided connected to a utility grid, the method including: receiving an actual grid frequency; and controlling rotor windings of the generator by a rotor control signal having a rotor winding reference frequency being set in dependence of the actual grid frequency.
Claims13
A method of controlling an induction generator connected to a utility grid, the method comprising:
- receiving an actual grid frequency;
- and
- controlling rotor windings of the generator by a rotor control signal having a rotor winding reference frequency (Ω_ref) being set in dependence of the actual grid frequency;
- wherein the rotor winding reference frequency (Ω_ref) is set such that a slip (s) adheres to a predefined value and substantially does not change with changing actual grid frequency (f) at least in a predefined frequency range of the actual grid frequency,
- wherein the slip (s) is given by:
- s=(Ω(f)−ns(f))/ns(f),
- wherein:
- f is the actual grid frequency,
- Ω is the actual speed of generator at the actual grid frequency f,
- ns(f) is a synchronous speed at the actual grid frequency f,
- wherein ns in rpm is given by ns=60*f/p, wherein p is the number of pole pairs of the generator rotor and f is given in Hz.
8 more elements
An arrangement for controlling an induction generator connected to a utility grid, the arrangement comprising:
- an input port configured to receive an actual grid frequency;
- and
- a controller configured to control rotor windings of the generator by a rotor control signal having a rotor winding reference frequency (Ω_ref) being set in dependence of the actual grid frequency;
- wherein the rotor winding reference frequency (Ω_ref) is set such that a slip (s) adheres to a predefined value and substantially does not change with changing actual grid frequency (f) at least in a predefined frequency range of the actual grid frequency,
- wherein the slip (s) is given by:
- s=(Ω(f)−ns(f))/ns(f),
- wherein:
- f is the actual grid frequency,
- Ω is the actual speed of generator at the actual grid frequency f,
- ns(f) is a synchronous speed at the actual grid frequency f,
- wherein ns in rpm is given by ns=60*f/p, wherein p is the number of pole pairs of the generator rotor and f is given in Hz.
8 more elements
Dependencies are inferred from the claim text.