Abstract: A method of operating a wind turbine during a service, wherein the wind turbine comprises at least one rotor-nacelle assembly, the or each rotor-nacelle assembly comprising a rotor; the method comprising: detecting that a service is to be or is being carried out on the wind turbine; and, on detecting that a service is to be or is being carried out on the wind turbine, reducing an operating level of the or each rotor-nacelle assembly.

Abstract: The present invention is directed to operation of a multi-rotor wind turbine comprising at least two rotors. Each rotor has a rated capacity. The method comprises monitoring a power output of the rotors, detecting that the power output of at least a first one of the rotors is below its rated capacity, detecting that the power output of at least a second one of the rotors is at its rated capacity, and controlling operation of the second rotor, such as to temporarily increase its power output to a value above its rated capacity.

Abstract: A method of damping oscillations in a multi-rotor wind turbine and a wind turbine are provided. The wind turbine comprises a wind turbine support structure and at least a first nacelle with a first rotor and a second nacelle with a second rotor, at least one of the nacelles being located at a position away from a central longitudinal axis of the wind turbine support structure. The method comprises the steps of receiving and processing motion data, selecting a damping algorithm and generating a pitch control signal. The processing comprises determining at least one prominent oscillation mode of the wind turbine support structure and selecting a corresponding damping algorithm.

Abstract: The invention relates to a method for detecting and controlling whirling oscillations of the blades of a wind turbine. The detection of the whirling oscillations is based on measurement signal indicative of blade oscillations, and a rotation-transformation of the measurement signal from a measurement frame into at least one target frame based on the whirling oscillation frequency. The rotation-transformation comprises a backward or forward rotation transformation direction relative to a rotor rotation direction. The control is based on an oscillation component obtained from the rotation-transformed measurement signal where the oscillation component is indicative of the whirling oscillation in the backward and/or forward rotation direction.

Abstract: A method for controlling a wind turbine is disclosed. During full load operation, a power reference value, Pref, representing a power level to be supplied to the power grid by the wind turbine, is received, and the wind turbine is controlled in order to produce an output power which is at or near the power reference value, Pref, while maintaining a constant torque on the generator. In the case that the produced output power of the wind turbine exceeds the power reference value, Pref, excess produced energy is stored in the energy storage system, and in the case that the produced output power of the wind turbine is below the power reference value, Pref, stored energy is retrieved from the energy storage system. A power level being equal to the power reference value, Pref, is supplied to the power grid.

Abstract: A method for controlling a multirotor wind turbine is disclosed. A first operational state of each of the energy generating units of the wind turbine is obtained. A difference in thrust acting on at least two of the energy generating units is detected. At least one constraint parameter of the set of operational constraints is adjusted in accordance with prevailing operating conditions and in accordance with the detected difference in thrust, and a new operational state for at least one of the energy generating units is derived, based on the at least one adjusted constraint parameter, the new operational state(s) counteracting the detected difference in thrust. Finally, the wind turbine is controlled in accordance with the new operational states for the energy generating units.

Abstract: The present invention relates to a method for solubilizing arabinoxylan-containing material (particularly insoluble arabinoxylan-containing material), comprising admixing a xylan-containing material with a xylanase comprising a polypeptide sequence shown herein as SEQ ID No. 3, SEQ ID No. 2, SEQ ID No. 1, SEQ ID No. 9, SEQ ID No. 10, SEQ ID No. 11 or SEQ ID No. 15, or a variant, homolog, fragment or derivative thereof having at least 75% identity with SEQ ID No. 3 or SEQ ID No. 2 or SEQ ID No. 1 or SEQ ID No. 9 or SEQ ID No. 10 or SEQ ID No. 11 or SEQ ID No. 15; or a polypeptide sequence which comprises SEQ ID No. 3, SEQ ID No. 2, SEQ ID No. 1, SEQ ID No. 9, SEQ ID No. 10, SEQ ID No. 11 or SEQ ID No. 15 with a conservative substitution of at least one of the amino acids; or a xylanase which is encoded by a nucleotide sequence shown herein as SEQ ID No. 6, SEQ ID No. 5, SEQ ID No. 4, SEQ ID No. 12, SEQ ID No. 13, SEQ ID No. 14, SEQ ID No. 16, SEQ ID No. 17 or SEQ ID No.

Abstract: The present invention relates to a method of preparing a corn based product said method comprising contacting a plant composition comprising (consisting of or consisting essentially of) corn or a corn by-product or a combination thereof with a xylanase comprising: i) a polypeptide as set forth in SEQ ID No. 8 or SEQ ID No. 7 or SEQ ID No. 6; or ii) a variant, fragment homologue, fragment or derivative thereof having at least 85% identity with SEQ ID No. 8 or SEQ ID No. 7 or SEQ ID No. 6; or with a xylanase encoded by: a) a nucleotide sequence shown herein as SEQ ID No. 3. SEQ ID No. 2 or SEQ ID No. 1; or b) a nucleotide sequence which can hybridize to the complement of SEQ ID No. 3. SEQ ID No. 2 or SEQ ID No. 1 under high stringency conditions: or c) a nucleotide sequence which has at least 80% identity with SEQ ID No. 3. SEQ ID No. 2 or SEQ ID No. 1. The present invention further relates to the use of the enzyme to produce corn based feedstuffs.

Abstract: The present invention relates to a system for dynamic pitch control primarily for wind turbine blades, which system calculates the pitch position of the wind turbine blades independently, which control system performs feedback regulation. The object of the pending patent application is to perform effective pitch regulation and hereby to reduce thrust on the tower and the rotor. This can be achieved if the system performs feed forward regulation of the pitch of the blades, based on the load of the previous blade in substantially the same position. Hereby it can be achieved that the actual load on the previous blade has passed the same position in relation to the wind blowing around the wind turbine. Hereby it can be achieved that measured parameters are used after a short delay to perform a very precise and highly efficient adjustment of the next wind turbine blade passing the same position.

Abstract: Provided herein are variants of Buttiauxella sp. phytases that may be used in industrial applications including methods for starch liquefaction, alcohol fermentations and for enhancing phosphate digestion in foods and animal feeds.

Abstract: Provided herein are variants of Buttiauxella sp. phytases that may be used in industrial applications including methods for starch liquefaction, alcohol fermentations and for enhancing phosphate digestion in foods and animal feeds.

Abstract: The present invention relates to a method for solubilising arabinoxylan-containing material (particularly insoluble arabinoxylan-containing material), comprising admixing a xylan-containing material with a xylanase comprising a polypeptide sequence shown herein as SEQ ID No. 3, SEQ ID No. 2, SEQ ID No. 1, SEQ ID No. 9, SEQ ID No. 10, SEQ ID No. 11 or SEQ ID No. 15, or a variant, homologue, fragment or derivative thereof having at least 75% identity with SEQ ID No. 3 or SEQ ID No. 2 or SEQ ID No. 1 or SEQ ID No. 9 or SEQ ID No. 10 or SEQ ID No. 11 or SEQ ID No. 15; or a polypeptide sequence which comprises SEQ ID No. 3. SEQ ID No. 2, SEQ ID No. 1, SEQ ID No. 9, SEQ ID No. 10, SEQ ID No. 11 or SEQ ID No. 15 with a conservative substitution of at least one of the amino acids; or a xylanase which is encoded by a nucleotide sequence shown herein as SEQ ID No. 6, SEQ ID No. 5, SEQ ID No. 4, SEQ ID No. 12, SEQ ID No. 13, SEQ ID No. 14, SEQ ID No. 16, SEQ ID No. 17 or SEQ ID No.

Abstract: Embodiments of the invention generally relate to wind turbine generators, and more specifically to the deactivation of wind turbines in a wind turbine park. A wind park controller may be configured to retrieve data indicating fatigue experienced by each wind turbine of the wind turbine park, and deactivate those turbines determined to be the most fatigued, thereby increasing the lifetime of turbines in the wind turbine park.

Abstract: A method of controlling a wind turbine comprising blades attached to a rotor hub for rotation in a rotor plane and a control system for individually pitching the blades relative to the hub. The method comprises dividing the rotor plane into a number of sectors, determining the individual sectors for each blade during the rotation by means of an azimuth angle sensor, and obtaining blade sensor data from a blade sensor on an individual blade relating to a sector, and comparing the obtained data with data relating to the same sector and representing blade sensor data on other blades. When an event is detected in a given sector, an individual pitch contribution is determined in the sector, and the blades are then pitched according to this individual pitch contribution for that given sector at least partly during passage of the sector.

Abstract: The present invention relates to a system for dynamic pitch control primarily for wind turbine blades, which system calculates the pitch position of the wind turbine blades independently, which control system performs feedback regulation. The object of the pending patent application is to perform effective pitch regulation and hereby to reduce thrust on the tower and the rotor. This can be achieved if the system performs feed forward regulation of the pitch of the blades, based on the load of the previous blade in substantially the same position. Hereby it can be achieved that the actual load on the previous blade has passed the same position in relation to the wind blowing around the wind turbine. Hereby it can be achieved that measured parameters are used after a short delay to perform a very precise and highly efficient adjustment of the next wind turbine blade passing the same position.

Abstract: The disclosure is provides for warning a wind turbine generator (WTG) in a wind park of an extreme wind event. According to one embodiment, one or more front line WTGs of the wind park that detect extreme wind events and provide the warning are adaptively selected based on a measured wind direction. Thus, the selection of front line WTGs is adaptive to changing wind conditions. In another embodiment, a wind park includes a group of one or more WTGs of a first type located in an inner region of the wind park and a plurality of WTGs of a second type located in an outer region of the wind park that at least partially surrounds the inner region. The first type of WTG is structurally weaker and/or rated for higher performance than the second type of WTG.

Abstract: A wind power plant, and its corresponding method of control, comprising a plurality of wind turbines and a power plant controller connected to at least a first and a second of the plurality of wind turbines, wherein the power plant controller is configured to detect a shutdown of the first wind turbine in response to current wind conditions, and wherein the power plant controller is further configured to control the second wind turbine such that an operating parameter of the second wind turbine is modified in response to detecting the automatic shutdown of the first wind turbine.

Abstract: Systems and methods for maintaining the active power production of a fluid turbine and regulating the temperature of an electrical generating component by controlling the reactive power production are disclosed. A thermal parameter of the electrical generating component is monitored. If the electrical generating component exceeds a thermal parameter the reactive power production of the turbine is reduced. A fluid turbine may be de-rated to further reduce an electrical generating component's thermal parameter. A fluid turbine may shut down to further reduce an electrical generating component's thermal parameter. A fluid turbine's power production is re-started when the electrical generating component returns to an acceptable thermal parameter.

Abstract: The invention relates to a method of controlling a wind turbine having a rotor with pitchable wind turbine blades and a generator for producing power, where a pitch reference value for the wind turbine blades is determined, and an operational parameter representing a loading on the wind turbine rotor exerted by the wind is measured at time intervals. A variation parameter reflecting a variation of the operational parameter over time is determined and used in the determination of a minimum pitch limit value of the pitch reference value. The wind turbine is then controlled according to the pitch reference value only if the pitch reference value is above or equal to the minimum pitch limit value, and otherwise according to the minimum pitch limit value.

Abstract: The present invention relates to a method for curtailing electrical power supplied from a wind turbine or a group of wind turbines to an associated power supply grid, the method comprising the steps of determining an available electrical power level from the wind turbine facility and setting a wind speed independent curtailment level. The curtailment level may be a percentage of an actual available electrical power level or a fixed power level. The method further comprises the step of operating the wind turbine facility in such a way that the generated electrical power supplied from the wind turbine facility equals the difference between an actual available electrical power level and the curtailment level. The present invention further relates to a wind turbine facility and a curtailing controller for carrying out the invention.