Abstract: A wind power plant supplies power to a utility grid in accordance with an active power reference, where the wind power plant comprises a plurality of wind turbine generators and a power plant controller arranged to send an active power set point to the wind turbine controller of each of the plurality of wind turbine generators.

Abstract: The invention relates to a method of controlling a wind turbine comprising a wind direction sensor, a yawing system, and a control system for yawing the wind turbine rotor relative to the wind. The method comprises obtaining an estimate for a wind power parameter as a function of a relative wind direction, where the wind power parameter is determined as one of a power, a torque, a blade load, or a blade pitch angle of the wind turbine. At time intervals, a data set is established comprising a wind power parameter and a wind direction parameter as measured by the wind direction sensor. Over time a group of data sets is then obtained for a number of pre-defined wind direction intervals, and a wind direction offset is determined for each interval by comparing the average wind power parameter for that interval with the estimate of the wind power parameter.

Abstract: A wind turbine generator controller is described. The controller comprises switching circuitry, for selectively activating and deactivating one or more transducer circuits, and overcurrent detection circuitry, for detecting an overcurrent state in relation to one or more of the transducer circuits. The switching circuitry is responsive to the detection on an overcurrent state to selectively deactivate one or more of the transducer circuits.

Abstract: A control system for controlling the power output of a plurality of renewable energy generators, a power network connecting those generators to a Point of Interconnection (PoI) with which the power network is connected to an external power grid, and measurement means configured to measure electrical parameters associated with the Point of Interconnection, wherein the control system is configured to: operate each renewable energy generator to achieve a respective current level at a terminal of the generator that is equal to a current set point; implement, during a grid fault event, a feedback control routine in which the control system: determines a measured value of an electrical parameter at the Point of Interconnection, determines a target value of the electrical parameter; and modifies the current set point based on the measured value and the target value of the electrical parameter.

Abstract: Controlling a wind turbine comprising a wind sensor, a number of pitch-adjustable rotor blades, a yawing system, and a control system for yawing the wind turbine rotor relative to the wind and for changing the pitch of the rotor blades. A wind parameter is measured by the wind sensor, and is indicative of the wind speed and/or the wind direction relative to the wind turbine. At least a first and a second set of wind correction parameters for different production modes of the wind turbine are obtained. The production mode of the wind turbine is then determined, which may be one of at least normal operation or non-production, and the measured wind parameter is then adjusted as a function of the set of wind correction parameters corresponding to the production mode at the time of adjusting. Hereby a more precise wind parameter is obtained which can be used in the controlling of the turbine.

Abstract: The present invention relates to a method, controller, wind turbine and wind farm that advantageously determines an ice throw risk zone (302) for a wind turbine (301), wherein the ice throw risk zone (302) defines an area surrounding the wind turbine (301) within which ice can be thrown from one or more blades of the wind turbine (301); determining whether the determined ice throw risk zone (302) impinges one or more exclusion zones; and if the determined ice throw risk zone (302) impinges one or more exclusion zones, determining an alteration to one or more operating parameters of the wind turbine (301) in order to alter the ice throw risk zone (302) such that the determined ice throw risk zone (302) does not impinge the one or more exclusion zones.

Abstract: A control system for yawing a wind turbine rotor relative to the wind and for changing the pitch of rotor blades. A wind direction parameter is measured by a wind direction sensor. The wind direction is calibrated as a function of a predetermined offset parameter, and then adjusted as a function of a wind direction compensation parameter. The adjusted relative wind direction is then used in the determining of a control parameter of the wind turbine. The parameters for the calibration and adjustment of the relative wind direction are obtained from a set of data comprising the wind direction relative to the wind turbine over time and as measured by the wind direction sensor on the wind turbine and as measured by a second wind direction sensor.

Abstract: The present invention relates to operation of a wind turbine using a power storage unit, such as a rechargeable battery, to power a group of power consuming units during grid loss. The wind turbine comprises a number of power consuming units being grouped into at least a first group and a second group, a first electrical converter for connecting the generator to the electrical grid, and a second electrical converter for connecting the electrical generator to the power storage unit. Upon detecting an occurrence of the grid loss, the generator is operated to ensure sufficient power of the power storage unit to operate the first group of power consuming units.

Abstract: A method of estimating a parameter relating to an upgrade of a wind turbine software includes toggling the wind turbine alternatingly between two modes, where the upgrade is implemented in one but not the other. Data is collected during toggling and divided into pairs of data parts, one from each mode. The data from the two modes is ordered separately and a quantile-to-quantile comparison is made.

Abstract: A method for controlling a wind turbine (1) is disclosed. The wind turbine (1) comprises one or more wind turbine blades (5), each wind turbine blade (5) being connected to a blade carrying structure (4) mounted on a hub (3), via a hinge (6) at a hinge position of the wind turbine blade (5), each wind turbine blade (5) thereby being arranged to perform pivot movements relative to the blade carrying structure (4) between a minimum pivot angle and a maximum pivot angle. A maximum noise level value representing a maximum allowable noise to be generated by the wind turbine (1) is received. An optimal pair of tip speed for the wind turbine (1) and rotational speed of the wind turbine (1) is derived, based on the received maximum noise level value. The pivot angle of the wind turbine blades (5) is then adjusted to a pivot angle which results in the derived optimal pair of tip speed and rotational speed.

Abstract: Method of controlling a wind turbine. A data set is obtained that includes a direction of the wind relative to the wind turbine and a pitch angle parameter representing a pitch angle of at least one of the wind turbine blades. Based on the obtained data sets, a statistical representation of the pitch angle parameter as a function of the relative wind direction is determined, which is then used in estimating a wind direction offset corresponding to the relative wind direction where the pitch angle parameter attains a maximum. The relative wind direction of the wind turbine is then adjusted as a function of the wind direction offset.

Abstract: A method of measuring transducer currents in a wind turbine generator control system is described. The method comprises selectively activating a set of one or more transducers in a group of transducers, taking a first measurement of the current through the group of transducers, selectively activating a different set of one or more transducers in the group of transducers, and taking a second measurement of the current through the group of transducers.

Abstract: A plurality of wind turbine blades or blade portions have substantially the same size and outer geometrical shape, and corresponding plies of the blades or blade portions having the same position within the respective wind turbine blades or blade portions have different fibre orientation angles relative to a pitch axis of the respective wind turbine blade or blade portion. By changing the fibre orientation angles of the corresponding plies a bend-to-twist coupling of the blade or blade portions may be varied amongst the plurality of blades or blade portions. The blades may then be tailored according to their siting within or on a wind turbine park. A common mould shape may be used across the plurality of wind turbine blades or blade portions, together with a more streamlined blade design process.

Abstract: A method for determining the load on a wind turbine blade, comprising: measuring the blade load by way of a wind turbine blade load sensor; estimating the temperature of the blade; and determining, based on the estimated temperature and the measured load, a temperature-corrected value for the load on the wind turbine blade. The invention also relates to a sensor system for a wind turbine blade, the system comprising a load sensor; a processing unit interfaced with the load sensor and configured to provide a temperature-corrected load parameter as an output, wherein the processing unit includes: a temperature estimation module that determines an estimated temperature of the blade in the vicinity of the load sensor based on at least one wind turbine parameter; and a load compensation module that determines the temperature-corrected load parameter based on the estimated temperature and the measurement of the load sensor.

Abstract: Embodiments herein describe a power converter in a wind turbine that includes a rectifier and an inverter. The rectifier includes a plurality of phase legs where each phase leg includes a plurality of full bridge cells configured to block fault current from flowing from a generator through the rectifier. Moreover, the wind turbine does not have any circuit breaker between the rectifier and the generator. The inverter also includes a plurality of phase legs where each phase leg includes a plurality of full bridge cells configured to block fault current from flowing from a transformer through the inverter. Moreover, the wind turbine does not have any circuit breaker between the inverter and the transformer.

Abstract: A battery system for storing electric energy, e.g. from a wind turbine. Battery modules are distributed in a housing and cooled by a housing cooling system. A monitoring algorithm receives input data from temperature and current sensors in battery cells from each of the battery modules, a state of a cooling system in each of the battery modules, a state of the housing cooling system such as fan rotation speed, and auxiliary inputs such as an ambient temperature. The monitoring algorithm processes the input data according to a predetermined model based on knowledge about the battery system. The model based estimated temperature within a specific battery cell is compared with the measured temperature to determine whether an abnormal operation exists.

Abstract: A method and apparatus for estimating a characteristic of a wind turbine electrical signal comprises buffering a sequence of sample values of the wind turbine electrical signal and a sequence of sample times corresponding with the sequence of sample values. The time periods represented by the sample times are variable. A sub-sequence of the buffered sample values to integrate is determined, based at least in part on a sum of the time periods. The characteristic is estimated by integrating the sample values in the sub-sequence.

Abstract: A shear web flange (36) for a shear web (32) of a wind turbine blade (18) is described. The flange (36) extends longitudinally and comprises a bonding surface (50) for bonding to an inner surface of a wind turbine blade (18). One or more protruding features (52a, 52b) protrude from the bonding surface (50). A method of making such a shear web flange (36) is also described as are a shear web (32) for a wind turbine blade (18), a wind turbine blade (18) and a method of making a wind turbine blade (18).

Abstract: A method of analyzing wind turbine noise is provided. The method comprises acquiring noise data representing noise produced by a wind turbine and acquiring data from a plurality of vibration sensors positioned at different locations about the wind turbine. The method further comprises identifying a region of interest in the noise data, the region of interest being a candidate for containing tonal noise generated by the wind turbine, and identifying a vibration sensor, the data for which correlates with the noise data in the region of interest. The method further comprises determining a threshold vibration level for the identified vibration sensor, the threshold being based on the vibration level detected by the identified vibration sensor in the region of interest, and determining when the vibration level detected by the identified vibration sensor exceeds the determined threshold.

Abstract: A wind turbine blade includes a lengthwise portion that extends between a root region and a tip region of the wind turbine blade. The lengthwise portion includes a cross section in which a first region surrounds a second region. The densities of the first and second regions vary with the first density being greater than the second density. The lengthwise portion includes a surface layer that bounds the first region, forms an exterior surface, and is configured to resist environmental degradation. At least one structural element extends longitudinally through the first region and is configured to reinforce the blade during use of the wind turbine. The lengthwise portion of a wind turbine blade may be made through an additive manufacturing process by depositing a main body in a plurality of layers. Each layer may be deposited in a plane generally parallel to a longitudinal axis of the lengthwise portion.