Power generation system of a multi-converter wind turbine and control method thereof
AssigneeSiemens Gamesa Renewable Energy Innovation & Technology S.L.
InventorsFernando Valderrey Sanchez, Francisco Jimenez Buendia, Jose Angel Allen Miguel
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Abstract
Wind turbine comprising a plurality of converters, which are dynamically switched between at least a first standby state, a second running state, and a third state with an active direct current link. Converters are switched from the first standby state to the third state when a required reactive power is higher than a reactive power capability of converters on the second running state and when a voltage transient occurs.
Claims13
Power generation system comprising control means configured to manage a plurality of converters of a wind turbine, each of the plurality of converters further comprising first power electronics between a generator and a capacitor and second power electronics between the capacitor and an electric grid, wherein the control means are configured to switch the plurality of converters between at least:
- a first standby state with no reactive power injection to the electric grid;
- a second running state wherein reactive power injection into the electric grid is regulated by a commutation of the first power electronics and the second power electronics;
- and
- a third state wherein reactive power injection into the electric grid is regulated by the commutation of the second power electronics, while the first power electronics are not commutating nor regulating a voltage of the capacitor,
- wherein the control means are further configured to switch some of the plurality of converters from the first standby state to the third state by applying a ramp to a current direct current link voltage up to a target direct current link voltage in order to activate a direct current link,
- wherein converters in the first standby state are configured to charge the direct current link through the first power electronics.
Method of controlling power generation of a wind turbine comprising a plurality of converters, each of the plurality of converters further comprising:
- first power electronics between a generator and a capacitor and second power electronics between the capacitor and an electric grid, wherein the method comprises dynamically switching a plurality of converters between at least:
- a first standby state with no reactive power injection to the electric grid,
- a second running state wherein reactive power injection into the electric grid is regulated by a commutation of the first power electronics and the second power electronics, and
- a third state wherein reactive power injection into the electric grid is regulated by the commutation of the second power electronics, while the first power electronics are not commutating nor regulating a voltage of the capacitor;
- and
- switching some of the plurality of converters from the first standby state to the third state by applying a ramp to a current direct current link voltage up to a target direct current link voltage in order to activate a direct current link,
- the method further comprising, when a converter is in the first standby state, charging the direct current link through the first power electronics.
Dependencies are inferred from the claim text.