9results about "Rotational speed control" patented technology

The application provides a kind of gust-oriented wind turbine unit overspeed prevention control method, device and medium, belong to wind turbine unit control field.The method comprises: obtaining real-time wind speed data and generator speed data;According to real-time wind speed data, determine whether to enter the gust mode of wind turbine unit;In the case of entering gust mode, adjust the minimum pitch angle of wind turbine unit operation to be the minimum pitch angle of gust mode operation;According to generator speed data, calculate generator speed acceleration;According to generator speed data and generator speed acceleration, determine whether to enter acceleration overspeed prevention control strategy;In the case of determining to enter acceleration overspeed prevention control strategy, superimpose preset pitch rate on normal pitch rate.In the gust mode, the pitch angle in the operation of wind turbine unit is raised, so that the angle of attack margin of blade can be kept in a safe range, and after entering the acceleration overspeed prevention control strategy, superimpose preset pitch rate on normal pitch rate.

The present application relates to the technical field of power equipment, and especially relates to an adjustable blade support frame of a vertical axis wind driven generator, which comprises a base, a central shaft rotatably connected to the base through a rotating seat, two groups of fixed discs fixed on the outer wall of the central shaft, a plurality of supports installed on the fixed discs, and an outer end surface of an outer blade movably connected to one end of the support through a hinge block one, a centrifugal driving mechanism fixed on the outer wall of the central shaft, and a plurality of angle adjusting mechanisms meshed with the outer side of the centrifugal driving mechanism; the adjustable blade support frame of the vertical axis wind driven generator effectively solves the pain point that the traditional fixed blade is difficult to adapt to variable wind conditions, and can actively limit the speed when the speed is too fast, so as to avoid damage to the equipment caused by power overload, ensure that the outer blade always operates in the efficient range, ensure that the fan can also continuously and stably operate when the wind speed is low, widen the applicable wind speed range of the equipment, and improve the utilization rate of wind energy resources.

Method for operating a wind turbine and wind turbine A method for operating a wind turbine (100) is specified, wherein the wind turbine has a rotor (10) with at least one rotor blade (1, 2, 3). The wind turbine is operable in a safety operation mode which is configured to slow down the rotation of the rotor. In the method, first information (I1) is representative of the operation mode in which the wind turbine is to be operated. The method comprises a step in which it is determined whether a first condition (C1) is fulfilled. The first condition comprises that a failure appears in the wind turbine during rotation of the rotor. If the first condition is fulfilled, second information (I2) is provided which is representative of the actual rotational speed of the rotor. Furthermore, third information (I3) is provided which is representative of the maximum allowable rotational speed of the rotor. Moreover, it is determined whether a second condition (C2) is fulfilled depending on the second and the third information. The second condition comprises that the actual rotational speed is at most the maximum allowable rotational speed. If the second condition is fulfilled, the first information is determined to be representative of the safety operation mode. Furthermore, a computer, a computer program, a computer- readable data carrier, a control device and a wind turbine are specified.

The invention discloses a wind generating set rotating speed stability control method and system based on far and near wind speeds. The method comprises the steps that a near-point wind speed signal and a far-point wind speed signal in front of an impeller of a wind generating set are obtained through a laser radar; the measurement distance of the near-point wind speed signal is fixed, and the measurement distance of the far-point wind speed signal is dynamically and adaptively determined according to the real-time wind condition of the wind field; then dynamically calculating a near-point weight coefficient and a far-point weight coefficient, carrying out weighted fusion on the near-point wind speed signal and the far-point wind speed signal to obtain a fused wind speed, and solving a fused wind speed change rate; solving a feed-forward gain coefficient based on an empirical method, and calculating a blade angle feed-forward superposition amount; and superposing the paddle angle feed-forward superposition quantity with a traditional feedback control output signal to generate a paddle angle command for control. A precise wind field model is not needed, parameter setting is easy and convenient, rotating speed fluctuation can be effectively restrained, power pulsation is reduced, the pitch frequency is reduced, the unit operation stability is improved, and the method is suitable for complex turbulent wind conditions.

The invention discloses a braking method of a vertical-axis wind turbine and belongs to the technical field of wind turbines. A controller, a detection component, a star sealing contactor and an electromagnetic plunger brake are installed in the vertical-axis wind turbine. The braking method for the generator under the fault condition comprises the following steps that S1, the vertical-axis wind turbine generates power normally; s2) the controller finds a fault; (S3) star sealing is started, and star sealing is conducted for t s; s4) controlling to cancel star sealing, and detecting the rotating speed; s5) judging whether the rotating speed is reduced to be within the action rotating speed range of the electromagnetic plunger brake, and if the rotating speed is reduced to be within the action rotating speed range of the electromagnetic plunger brake, executing the step S6); the method has the advantages that the mode that the star sealing speed reduction technology and the electromagnetic braking technology are combined is adopted, stable speed reduction and reliable braking of the vertical axis wind turbine are effectively achieved, and the power generation state is automatically recovered after faults are eliminated.

A method for operating a wind turbine (100) is specified, wherein the wind turbine has a rotor (10) with at least one rotor blade (1, 2, 3). The wind turbine is operable in a safety operation mode which is configured to slow down the rotation of the rotor. In the method, first information (I1) is representative of the operation mode in which the wind turbine is to be operated. The method comprises a step in which it is determined whether a first condition (C1) is fulfilled. The first condition comprises that a failure appears in the wind turbine during rotation of the rotor. If the first condition is fulfilled, second information (I2) is provided which is representative of the actual rotational speed of the rotor. Furthermore, third information (I3) is provided which is representative of the maximum allowable rotational speed of the rotor. Moreover, it is determined whether a second condition (C2) is fulfilled depending on the second and the third information. The second condition comprises that the actual rotational speed is at most the maximum allowable rotational speed. If the second condition is fulfilled, the first information is determined to be representative of the safety operation mode. Furthermore, a computer, a computer program, a computer-readable data carrier, a control device and a wind turbine are specified.

The application discloses a wind turbine blade stall monitoring and control method and system, the method is: pre-configuring the reference wind speed-active power curve under different air densities and the reference generator speed-nacelle acceleration curve; obtaining the operation data of the unit; obtaining the current air density according to the air temperature; obtaining the current wind speed-active power curve according to the wind speed and the power generation; obtaining the current generator speed-nacelle acceleration curve according to the generator speed and the nacelle acceleration; comparing the current wind speed-active power curve with the reference wind speed-active power curve under the current air density; at the same time, comparing the current generator speed-nacelle acceleration curve with the reference generator speed-nacelle acceleration curve under the current air density; comprehensively judging whether the blade stalls and the stall degree according to each comparison result. The application can ensure the safe operation of the unit, maximize the power generation and has low cost.

The invention relates to the field of wind generating set variable pitch control, and provides a wind generating set variable pitch control method and system based on fuzzy control, and the method comprises the steps: carrying out the filtering and statistical analysis of the wind speed data obtained in real time, and calculating the turbulence intensity capable of accurately representing the current wind condition characteristics; then, self-adaptive gain scheduling is carried out on the turbulence intensity, and a self-adaptive output gain factor positively correlated with the wind regime intensity is dynamically generated; meanwhile, fuzzy reasoning and defuzzification processing are conducted on the rotating speed deviation and the change rate of the generator through a fuzzy controller, and the basic paddle angle variable quantity is obtained; and finally, performing gain adjustment on the basic pitch angle variable quantity and a dynamic self-adaptive output gain factor, then synthesizing a corresponding pitch angle instruction, and outputting the pitch angle instruction to a pitch control execution mechanism. The technical problem that a fixed control strategy in variable pitch control of the wind generating set cannot adapt to dynamic changes of wind conditions is solved, and good environment self-adaptive capacity is achieved.

The invention discloses a wind turbine generator overspeed variable pitch coordinated load shedding frequency modulation control method based on radar feedforward, which comprises the following steps: performing multi-sight measurement and wind field reconstruction on an upstream wind field of a wind turbine generator based on a cabin type laser radar of a full-coherent Doppler detection principle to obtain a predicted incoming flow wind speed at the height of a hub of the wind turbine generator; constructing a pneumatic subsystem mathematical model of the wind turbine generator based on a per-unit value method; hierarchical coordination control is performed on the wind turbine generator based on overspeed load shedding and variable pitch load shedding, and power margin reservation of the wind turbine generator in different wind speed intervals is realized; through load shedding parameter iterative solution and multi-objective optimization, collaborative optimization of precise control of the load shedding depth and variable-pitch wear suppression of the wind turbine generator is realized; and obtaining a power regulation instruction of the wind turbine generator based on the primary frequency modulation control method under the double time scales. The invention belongs to the field of wind generating set control. According to the method, the primary frequency modulation performance can be improved while the pitch angle adjustment amplitude is minimized.