Abstract:
The invention relates to control of a wind turbine comprising a plurality of multi-axial accelerometers mounted at different positions in the nacelle and/or in a top portion of the tower. The position and orientation of each accelerometer as mounted is obtained, accelerations in at least two different directions by each accelerometer are measured during operation of the wind turbine. From a number of pre-determined mode shapes for the movement of the wind turbine is then determined an absolute position of at least one of the accelerometers during operation of the wind turbine based on the measured accelerations, the mount position and orientation of each accelerometer and the pre-determined mode shapes. Hereby a more precise absolute position during operation is obtained which can be used in the controlling of the turbine.
Abstract:
The present invention relates to control of wind turbines where a fatigue load measure is taken into account. Control of a wind turbine is described where a control trajectory is calculated based on a fatigue load measure, the fatigue load measure being determined from a predicted operational trajectory. In embodiments the predicted operational trajectories are calculated by using a model predictive control (MPC) routine, and the fatigue load measure includes a rainflow count algorithm.
Abstract:
A method is disclosed for controlling a multi-rotor wind turbine (100) with at least two rotors (110, 120, 130, 140). The method comprises a step of receiving, from a first one of the at least two rotors (110-140), an error signal, and a step of, in dependence of the error signal, determining respective error responses for the first one and at least a second one of the other rotors (110-140), at least one of the error responses comprising a control signal and the respective error responses for the first and second rotors (110-140) being different. The method further comprises a step of submitting the at least one control signal to a controller (115, 125, 145) of the respective rotor (110).
Abstract:
The present disclosure relates to a control system for a wind turbine comprising more controllers and where at least some of the controllers operate at different sample frequencies. The control system comprises at least two controller units, a first controller (10) for determining an operational value (OV) of a sub-system and a second controller (20) for the sub-system. The second controller operates at a higher sample frequency than the first controller. It is disclosed that a faster reaction to a received demand value (V1), received for controlling the sub-system, can be obtained by setting the operational value (OV) of the sub- system as the sum of an internal operational value (V5) and a difference value (V4).
Abstract:
The present invention relates to control of wind turbines in a situation where a fault condition is detected. Control of a wind turbine is described where a control trajectory and a safe-mode trajectory are calculated based on the current operational state of the wind turbine. If the fault condition is detected the wind turbine is controlled using the safe-mode trajectory, otherwise, the normal operation of the wind turbine is continued where the wind turbine is controlled using the control trajectory.
Abstract:
The present disclosure relates to controlling an operation of a wind turbine. A first plurality of extreme load measures indicative of extreme loads experienced by at least part of the wind turbine during the first period of time are determined and a load probability characteristic is then determined based on a statistical analysis of the distribution of the first plurality of extreme load measures. A control strategy for controlling the operation of the wind turbine is then modified based at least in part on a comparison of the load probability characteristic and a design load limit and the wind turbine is then subsequently controlled in accordance with the modified control strategy for a second period of time.
Abstract:
The present disclosure relates to control of a wind turbine in connection with a low voltage event (35) where the grid voltage drops from a first level and to a second lower level. Upon detection of the termination of the low voltage event (t2), the turbine is operated in a recovery mode (31) where the turbine is operated by use of a control trajectory. The control trajectory being determined by using a model predictive control (MPC) routine.
Abstract:
A method of controlling a wind turbine comprising at least one rotor blade, and at least one accelerometer housed within a nacelle or a tower of the wind turbine. The method comprises: determining a whirling mode frequency for the wind turbine; measuring an acceleration signal that is indicative of the movement of the nacelle of the wind turbine; determining a frequency spectrum of the measured acceleration signal in the proximity of the determined whirling mode frequency; determining a characteristic value that is representative of the energy content of the measured acceleration signal having the determined frequency spectrum; and performing at least one control action if the characteristic value exceeds a predetermined threshold.
Abstract:
The present invention relates to control of a wind turbine system comprising a plurality of wind turbine modules mounted to a common support structure, i.e. to control of a multi-rotor wind turbine system. The invention discloses a control system for a multi-rotor wind turbine system which comprises local controllers operable to control the wind turbine modules in accordance with local control objectives and a central controller configured to monitor the operation of the wind turbine system and based thereon calculate the local control objectives. The central controller is implemented as a model predictive controller (MPC).
Abstract:
A method of controlling a wind power plant (12) including an energy storage device (44, 46), the wind power plant (12) being connected to a power grid (19) and comprising one or more wind turbine generators (1) that produce electrical power for delivery to the power grid (19), the method comprising: processing input data related to one or more inputs to the wind power plant (12) to determine a probability forecast for the or each input; and controlling charging and discharging of the energy storage device (44, 46) in accordance with the or each probability forecast and a prescribed probability of violating one or more grid requirements.