Disclosed are a method and apparatus for detecting a fault, and a method and apparatus for training a model. The method includes: acquiring characteristic data and actual temperature of a first wind turbine among n wind turbines, wherein the characteristic data of the first wind turbine is intended to characterize a working state of the first wind turbine, and n is an integer greater than 1; acquiring a prediction temperature set by inputting the characteristic data of the first wind turbine into a temperature prediction model corresponding to each of the n wind turbines; and detecting, based on the predicted temperature set and the actual temperature of the first wind turbine, whether the first wind turbine encounters a fault. Compared with the related art which depends on the working experience of the staff, the technical solution according to the embodiments of the present disclosure can more accurately detect whether a wind turbine encounters a fault, and provide early warning in time, so as to reduce the failure rate of the wind turbine.

A river, tidal, wave or ocean current turbine, a wind turbine or a solar panel harnesses an optimum value of renewable energy from variable water flow or wind flow or from electromagnetic energy from sunlight harnessed by photovoltaic conversion to electricity. A harnessing module comprising a propeller facing, for example, water or wind flow and a generator driven by the propeller, thus may harness variable electric power from water (or wind) renewable energy and may be preferably connected to feedforward electricity source and preferably a feedback variable electrical load to an electrical voltage regulator apparatus of a land module and to a motor generator set or voltage converter by a flexible electrical cable for receiving a variable rotational speed converted to variable electrical frequency, the voltage regulator automatically providing a predetermined minimum electrical power/voltage output at constant frequency to the motor generator set or a voltage converter and output at constant frequency to a constantly varying grid load. The variable electrical input from harnessing modules is delivered to the voltage regulator and converted to a constant electrical frequency by the motor generator set. In alternative embodiments, the voltage regulator is replaced by a voltage regulator in series with a servo motor and a variable voltage transformer and, in a third embodiment, the voltage regulator is replaced by a power converter.

A variable speed pumping system includes a generator motor including a frequency converter, in which the variable speed pumping system, in the pumping mode, supply a power command to the generator motor to perform power control, and the power control correction signal generator adds a value obtained by multiplying a signal based on a difference between the power input command and an actual power input measured by a power detector in the pumping mode by a constant gain to a signal based on the deviation and inputs the added value to an integration control element to generate the power control correction signal based on an output signal of the integration control element.

A flywheel is attached to a shaft of a turbine. As the shaft rotates, the flywheel swings outwards away from the shaft and regulates the angular velocity of the rotating shaft. In an embodiment, there are multiple flywheels attached to the shaft. In another embodiment there is a first flywheel that controls a second flywheel. In another embodiment, the flywheel has adjustable or centrifugal displacement of counterbalanced masses for effective rotational diameter with effective rotational balance. In another embodiment, a small pilot centrifugal displacement flywheel may control a clutch by rotational velocity and may include a hysteresis control. An example of a clutch may limit that degree to which the arms of the flywheel may be extended and/or retracted. In another embodiment, a small pilot centrifugal displacement flywheel controls the hysteresis of a centrifugal flywheel displacement.

The present invention provides a method of operating a wind turbine. The wind turbine comprises at least one rotatable blade. The method comprises the steps of providing a load sensor configured to generate a load signal representing loading on the blade, generating a first load signal when the blade is in a first position, and generating a second load signal when the blade is in a second position. Additionally, the method comprises steps of detecting a rotational speed of the blade, calculating a weight force on the blade based on the first and the second load signal, and calculating a centrifugal force on the blade based on the first and the second load signal. Subsequently, the weight force is compared with a predetermined weight force, and the centrifugal force is compared with a predetermined centrifugal force at the detected rotational speed. Finally, a risk of ice throw is determined based on the comparisons of the weight force and the centrifugal force with the predetermined forces.

A method for iteratively estimating a wind speed at a wind turbine is disclosed, said wind turbine comprising a rotor carrying a set of wind turbine blades, each wind turbine blade having a variable pitch angle. A minimum tip speed ratio, λ.sub.min, is derived, based on an obtained pitch angle, θ. The minimum tip speed ratio, λ.sub.min, defines a limit between a stable and an unstable control region. An initial tip speed ratio, λ.sub.init>λ.sub.min, is selected, and an initial estimated wind speed, v.sub.init, is derived based on the initial tip speed ratio, λ.sub.int, and an obtained rotational speed, ω, of the rotor. An estimated wind speed, v.sub.est, is iteratively derived, based on the obtained rotational speed, ω, and the obtained pitch angle, ω, and using the derived initial estimated wind speed, v.sub.init, as a starting point. The iterative process converges fast and reliably.

Wind turbine ice protection systems and methods are provided. An ice protection system for heating a wind turbine blade includes: a heater disposed in an interior of the wind turbine blade, the heater for heating air; a blower disposed in the interior of the wind turbine blade and for moving the air across the heater to generate a heated airflow; a duct disposed in the interior of the wind turbine blade, the duct for receiving the heated airflow and releasing the heated airflow into the interior of the wind turbine blade; and an electrical control subsystem disposed in the wind turbine for controlling one or more components of the ice protection system.

Provided is a protection method for use in fan malfunctions, applicable to an electronic device, and effective in preventing the electronic device from being overheated. The electronic device includes a fan, temperature sensor, and processor. The method includes steps of: limiting the processor's performance, upon determination that not only is the fan's rotation speed greater than or equal to a predetermined upper rotation speed limit, but the electronic device's temperature sensed by the temperature sensor is also greater than or equal to a predetermined upper temperature limit; determining whether the fan's rotation speed is less than or equal to a first restored rotation speed when the fan's rotation speed is determined to be less than the predetermined upper rotation speed limit; and stopping the limiting of the processor's performance when the fan's rotation speed is determined to be less than or equal to the first restored rotation speed.

Disclosed are a method and apparatus for detecting a fault, and a method and apparatus for training a model. The method includes: acquiring characteristic data and actual temperature of a first wind turbine among n wind turbines, wherein the characteristic data of the first wind turbine is intended to characterize a working state of the first wind turbine, and n is an integer greater than 1; acquiring a prediction temperature set by inputting the characteristic data of the first wind turbine into a temperature prediction model corresponding to each of the n wind turbines; and detecting, based on the predicted temperature set and the actual temperature of the first wind turbine, whether the first wind turbine encounters a fault. Compared with the related art which depends on the working experience of the staff, the technical solution according to the embodiments of the present disclosure can more accurately detect whether a wind turbine encounters a fault, and provide early warning in time, so as to reduce the failure rate of the wind turbine.

A condition monitoring system comprises a measurement device and a processing server. The measurement device measures a condition of an apparatus provided for a wind power generation facility. The processing server associates measurement data measured by the measurement device with load data representing an operating load of the wind power generation facility acting at a time when the measurement data is measured and cumulative load data representing a cumulative operating load accumulated up to the time when the measurement data is measured, to generate a data set of the load data, the cumulative load data, and the measurement data for the time when the measurement data is measured.