초록 ▼

A method for controlling the operation of a wind turbine is provided. The method includes receiving, by means of a power controller, an active power reference signal and an active power feedback signal; determining, by means of the power controller and based on the active power reference signal and

A method for controlling the operation of a wind turbine is provided. The method includes receiving, by means of a power controller, an active power reference signal and an active power feedback signal; determining, by means of the power controller and based on the active power reference signal and the active power feedback signal, a first voltage control signal and a power controller frequency signal; determining, by means of a frequency droop gain unit and based on the power controller frequency signal, a second voltage control signal; determining, by means of a theta integrator unit and based on the power controller frequency signal, an actual angle signal being indicative for an actual angle between a rotating dq reference frame and a stationary abc reference frame; and controlling operation of a network bridge based on the first voltage control signal, the second voltage control signal, and the actual angle signal.

대표청구항 ▼

1. A method for controlling the operation of a wind turbine, wherein the wind turbine comprising a mechanical drive train, an electric generator being mechanically connected to the mechanical drive train, and a power converter being electrically connected to the electric generator, the wind turbine

1. A method for controlling the operation of a wind turbine, wherein the wind turbine comprising a mechanical drive train, an electric generator being mechanically connected to the mechanical drive train, and a power converter being electrically connected to the electric generator, the wind turbine forming a part of a wind park which is connectable to a utility grid via a HVDC power transmission system and/or via an AC auxiliary power transmission system, and further wherein the wind park is in a first operational mode in which the wind park is connected to the utility grid solely via the AC auxiliary power transmission system, the method comprising: receiving, by means of a power controller, an active power reference signal being indicative for an active power which is supposed to be generated by the wind turbine and an active power feedback signal being indicative for an active power which is actually generated by the wind turbine;determining, by means of the power controller and based on the active power reference signal and on the active power feedback signal, a first voltage control signal and a power controller frequency signal;determining, by means of a frequency droop gain unit and based on the power controller frequency signal, a second voltage control signal;determining, by means of a theta integrator unit and based on the power controller frequency signal, an actual angle signal being indicative for an actual angle between a rotating dq reference frame and a stationary abc reference frame; andcontrolling an operation of a network bridge of the power converter based on the first voltage control signal, the second voltage control signal, and the actual angle signal. 2. The method as set forth in claim 1, further comprising receiving, by means of a voltage controller, a reference voltage signal being indicative for an AC voltage which is supposed to be provided by the network bridge and a magnitude of a feedback voltage being indicative for the AC voltage which is actually provided by the network bridge; anddetermining, by means of the voltage controller and based on the magnitude and on the reference voltage signal, a voltage controller signal; wherein the second voltage control signal is further determined based on the voltage controller signal. 3. The method as set forth in claim 2, wherein the reference voltage signal comprises two components, a first component and a second component, wherein the first component is provided by a wind turbine controller and the second component is derived from the power controller frequency signal, and the second component is provided by the frequency droop gain unit. 4. The method as set forth in claim 1, wherein the second voltage control signal is given by the sum of a frequency droop voltage signal provided by the frequency droop gain unit and the voltage controller signal. 5. The method as set forth in claim 1, wherein the actual angle signal further depends on a frequency reference signal being indicative for the nominal frequency of an AC system which collects AC power generated by the wind turbine and by other wind turbines of the wind park. 6. The method as set forth in claim 1, wherein the theta integrator unit receives an input signal which comprises the sum of the power controller frequency signal and the frequency reference signal. 7. The method as set forth in claim 6, wherein the input signal for the theta integrator unit comprises the sum of the power controller frequency signal, the frequency reference signal, and a frequency modification signal, wherein the frequency modification signal is based on an reactive power feedback signal. 8. The method as set forth in claim 1, further comprising receiving, by means of a power feedforward unit, the active power reference signal; andgenerating, by means of the power feedforward unit, a power feedforward voltage signal); wherein the first voltage control signal is further determined based on the power feedforward voltage signal). 9. The method as set forth in claim 1, wherein the first voltage control signal is given by the sum of an output signal of the power controller, which output signal is associated with the first voltage control signal, and the power feedforward voltage signal. 10. A network bridge controller for controlling an operation of a network bridge of a power converter of a wind turbine, wherein the network bridge controller is capable of adopting a configuration having in an activated state: a power controller,a theta integrator unit, anda frequency droop gain unit, wherein the network bridge controller is configured for performing an operational control of the wind turbine by carrying out the method as set forth in claim 1. 11. The network bridge controller as set forth in claim 10, further comprising: a voltage controller for receiving a reference voltage signal being indicative for an AC voltage which is supposed to be provided by the network bridge and a magnitude of a feedback voltage being indicative for the AC voltage which is actually provided by the network bridge and for determining a voltage controller signal based on the magnitude and on the reference voltage signal; wherein the second voltage control signal is further determined based on the voltage controller signal. 12. A wind turbine comprising a mechanical drive train having a wind rotor with at least two rotor blades;an electric generator being mechanically connected to the mechanical drive train);a power converter being electrically connected to the electric generator, wherein the power converter comprises: an AC-DC generator bridge for rectifying an AC power input provided by the electric generator, a direct current link receiving the rectified an AC power input, and a DC-AC network bridge which converts a DC power of the direct current link into an AC power output; and a network bridge controller as set forth in claim 10. 13. A power generating and forwarding system comprising: a wind park comprising a plurality of wind turbines;an AC system for collecting an AC power being generated by the plurality of wind turbines;a HVDC power transmission system being connectable to the AC system and/or to a utility grid for transferring DC power from the AC system to the utility grid, wherein the HVDC power transmission system comprises a HVDC diode rectifier, a HVDC power transmission cable, and a DC-AC converter;an AC auxiliary power transmission system being connectable to the AC system and/or to the utility grid for transferring AC power between the utility grid and the AC system; wherein at least some of the wind turbines are a wind turbine as set forth in claim 1. 14. The power generating and forwarding system as set forth in claim 13, wherein the AC power is transferred from the utility grid to the AC system by the AC auxiliary power transmission system. 15. A computer program for controlling the operation of a wind turbine, the computer program, when being executed by a data processor and in particular by a data processor of a wind turbine controller and/or of a network bridge controller, is adapted for controlling and/or for carrying out the method as set forth in claim 1.