39results about "Rotational speed control" patented technology

The invention relates to the technical field of power equipment, in particular to an adjustable blade supporting frame of a vertical axis wind turbine, which comprises a base, a central shaft is rotatably connected to the base through a rotating seat, two groups of fixed discs are fixedly arranged on the outer wall of the central shaft, and a plurality of brackets are mounted on the fixed discs; one end of the support is movably connected with the inner end face of the outer blade through a first hinge block, a centrifugal driving mechanism is fixedly arranged on the outer wall of the center shaft, and a plurality of angle adjusting mechanisms are in transmission engagement with the outer side of the centrifugal driving mechanism. According to the adjustable blade supporting frame of the vertical-axis wind turbine, the problem that a traditional fixed blade is difficult to adapt to variable wind conditions is effectively solved, active speed limiting can be achieved when the rotating speed is too high, damage to equipment caused by power overload can be avoided, it can be guaranteed that an outer blade always operates in a high-efficiency interval, and the service life of the equipment is prolonged. And it can be ensured that the draught fan can continuously and stably operate when the wind speed is low, the applicable wind speed range of equipment is widened, and the utilization rate of wind energy resources is increased.

An underwater power plant (1) for arrangement in a water current (vc), the underwater power plant (1) comprising at least two rotatable stations (3,4) and at least one endless traction member (2a, 2b) connected to the rotatable stations (3,4). The at least one endless traction member (2a, 2b) is configured to rotate the at least two rotatable stations (3,4) as the endless traction member (2a; 2b) moves in its lengthwise direction (T). At least one asymmetric foil (5) is connected to the at least one endless traction member (2a, 2b) and configured to move the endless traction member (2a, 2b) in its lengthwise direction (T) as the water current (vc) impacts the asymmetric foil (5). The at least one asymmetric foil (5) comprises an upper camber side (35) and lower camber side (36). The upper camber side (35) of at least one foil (5) is facing in a direction outwards (O) of the at least one endless traction member (2a, b) and the lower camber side (36) of at least one foil (5) is facing in a direction inwards (I) of the at least one endless traction member (2a, b).

It is described a control device for controlling a wind turbine (1), the wind turbine comprising a rotor (3) and at least one blade (6) being rotatable mounted to the rotor (3). The control device comprises a detecting device (9) being configured to detect an amount of a bending moment of the blade; and a change element having an input and an output, wherein the input is configured to receive the detected amount of the bending moment of the blade (6) and the output is configured to output a response to a differential of the detected amount of the bending moment of the blade (6). The control device is configured to control the wind turbine (1) based on the response.

The application discloses a load reduction control method and system of a wind turbine under extreme gust, comprising: through judging the current wind wheel speed deviation and the wind wheel speed deviation change rate, when exceeding the set threshold, superimposing an additional pitch rate on the pitch instruction; through judging the current cabin acceleration, when the cabin acceleration exceeds the threshold, after a delay period, the wind wheel speed is greater than the rated wind wheel speed and the wind wheel acceleration is greater than the threshold, superimposing the additional pitch rate on the pitch instruction; through judging the yaw error measured by the cabin wind vane, when the yaw error exceeds the yaw error threshold, reducing the set value of the wind wheel speed, i.e. reducing the impeller speed, to reduce the load of the wind turbine. The application can effectively reduce the component load of the wind turbine under extreme gust, and realize the lightweight design of the unit.

This invention provides an adaptive operation control method for tidal current power generation load conditions, comprising: when the tidal current velocity increases and the fixed-pitch propeller generator meets the adjustment conditions, adjusting the current control mode according to the following strategy: specifically, when the current control mode is torque mode, the next control mode is rated speed mode; when the current control mode is rated speed mode, the next control mode is low rated speed mode; when the current control mode is low rated speed mode, the next control mode is shutdown mode; when the tidal current velocity decreases and the fixed-pitch propeller generator meets the adjustment conditions, adjusting the current control mode according to the following strategy: specifically, when the current control mode is torque mode, the next control mode is shutdown mode; when the current control mode is rated speed mode, the next control mode is torque mode; when the current control mode is low rated speed mode, the next control mode is rated speed mode. This invention improves the operational safety of the generator set.

The invention describes a control device (2) for a variable speed wind turbine (3), the control device (2) comprising: a load analysis module (10) configured to analyze a plurality of environmental values ​​(10_1, ..., 10_n) to determine when the rotation speed of the aerodynamic rotor (30) has reached its rated value (ω rated ), whether the instantaneous wind turbine load (L) is lower than the load threshold (L max ); and a speed boost module (11) configured to increase the speed of the wind turbine when the wind turbine load (L) is below the load threshold (L max ), determine the speed increment (ω) of the rotation speed of the pneumatic rotor (30) inc ).

Method for operating a wind turbine, wherein the wind turbine includes a rotor, wherein the rotor has at least one rotor blade, wherein the rotor is set up to rotate at an optimal speed, wherein the optimal speed enables the theoretically maximum possible power gain to be delivered, wherein the method comprises: a Determining a turbulence parameter; and b Operating the wind turbine at a rotor speed that is increased by a speed deviation amount compared to the optimal speed; where the speed deviation amount depends on the turbulence parameter.

The present invention relates to the technical field of rotational speed monitoring of wind turbines, and specifically discloses a method for monitoring and protecting the rotational speed of a wind turbine, which specifically includes the following steps: obtaining the maximum allowable rotational speed ω before the unit is connected to the grid max , the protection action rotational speed ω pro , the protection action delay t pro ; according to the parameters of the unit, obtaining the relational expression θ = g(v), and obtaining the minimum wind speed v min for protection action; collecting the wind speed v act , and converting it to the wind speed v sta under the standard air density; obtaining the corresponding minimum pitch angle θ act at the wind speed v min ; setting that when starting the machine, the pitch angle is restricted to be not less than the minimum pitch angle θ min ; monitoring and comparison: comparing v sta with the minimum wind speed v min for protection action; according to the wind speed comparison situation, comparing the actually measured rotational speed ω rot with the protection action rotational speed ω pro ; according to the rotational speed comparison situation, judging whether the actually measured rotational speed ω rot is abnormal, and if so, triggering protection shutdown. The present invention can ensure that there is no overspeed risk before the unit is connected to the grid, and can timely detect the abnormalities existing in the rotational speed acquisition system, ensuring the safety of the unit.

The invention provides a tidal current energy power generation load working condition self-adaptive operation control method which comprises the following steps: when a tidal current flow rate is increased and a fixed-pitch propeller generator set meets an adjustment condition, adjusting a current control mode according to the following strategy; specifically, when the current control mode is a torque mode, the next control mode is a rated rotating speed mode, when the current control mode is the rated rotating speed mode, the next control mode is a low rated rotating speed mode, and when the current control mode is the low rated rotating speed mode, the next control mode is a shutdown mode; when the tidal current flow velocity is reduced and the fixed-pitch propeller generator set meets the adjusting condition, the current control mode is adjusted according to the following strategy; specifically, when the current control mode is the torque mode, the next control mode is the shutdown mode, when the current control mode is the rated rotation speed mode, the next control mode is the torque mode, and when the current control mode is the low rated rotation speed mode, the next control mode is the rated rotation speed mode. The operation safety of the generator set is improved.

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.

A control arrangement for a variable-speed wind turbine includes a loading analysis module configured to analyse a number of environment values to establish whether the momentary wind turbine loading is lower than a loading threshold when the rotational speed of the aerodynamic rotor has reached its rated value; and a speed boost module configured to determine a speed increment for the rotational speed of the aerodynamic rotor if the wind turbine loading is lower than the loading threshold.

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.

The invention provides a wind turbine generator system based on proximity switch and overspeed module optimization, and relates to the field of wind turbine generator monitoring, and the wind turbine generator system comprises a WD231-P overspeed module which has a reinforced filtering algorithm, replaces original WD231 and LE2131D modules, and improves the anti-interference capability of rotating speed signals; the YiKe 8mm distance measuring proximity switch replaces the original high-speed and low-speed shaft proximity switches, so that the signal interference jump probability is reduced; the shielding cable is used for signal transmission of the high-speed shaft proximity switch and enhancing the anti-electromagnetic interference performance; and the grounding optimization assembly is used for removing a generator carbon brush to abrade a ground wire at the output end of the power supply switching power supply G53.7 and blocking a high-frequency interference path. According to the scheme, through collaborative design of proximity switch upgrading, overspeed module optimization, cable shielding and grounding transformation, the problem of rotating speed signal interference of the wind turbine generator is solved in a whole chain from signal acquisition, transmission and processing, and stable operation with zero false triggering is achieved.

The invention provides an anti-overspeed device and control method for a variable pitch system of a wind generating set, and the device comprises a control unit which is arranged in the variable pitch system; the rotating speed sensor is arranged in the hub and used for detecting the rotating speed of the hub to obtain a hub rotating speed detection value and sending the hub rotating speed detection value to the control unit; the vibration sensor is used for detecting hub vibration to obtain a hub vibration detection value and sending the hub vibration detection value to the control unit; and the control unit executes a paddle retracting action when the hub rotating speed detection value exceeds the preset rotating speed threshold value and the hub vibration detection value exceeds the preset vibration threshold value. According to the scheme, the safety of the variable pitch system is improved, safe operation of the wind generating set is ensured, and potential safety hazards and equipment damage are avoided.

A fully automatic controlled forced yaw system for preventing runaway of a wind turbine generator set comprises: a wheel hub speed measuring device, a forced yaw system controller, a wind direction monitoring device and a signal judgment module, wherein the wind direction monitoring device outputs a wind direction monitoring signal to the signal judgment module, and then the signal judgment module outputs a cabin left deviation signal or a cabin right deviation signal to the forced yaw system controller; the forced yaw system controller has a first signal output terminal to a fourth signal output terminal, and outputs the following four signals respectively: a normal system operation feedback signal is input to a digital quantity feedback point of an original wind turbine generator set control system; a yaw system brake of the unit is opened or a yaw frequency converter is manually triggered and input to the original wind turbine generator set yaw system; a left yaw signal is input to the yaw system of the wind turbine generator set to control the cabin to yaw to the left; and a right yaw signal is input to the yaw system of the wind turbine generator set to control the cabin to yaw to the right.

A method for operating a wind turbine (10), wherein the wind turbine (10) has a rotor (18) containing at least one rotor blade (22) and a blade adjustment drive system (68) coupled to the at least one rotor blade (22), wherein the blade adjustment drive system (68) is configured to adjust the angle of attack of the at least one rotor blade (22), the method comprising: Determining an actual value of a first variable indicative of an overspeed condition of the wind turbine (10); Determining an actual value of a second variable of the wind turbine (10) that is correlated with the time rate of change of the first variable; and Estimating an occurrence of an overspeed condition of the wind turbine (10) based on at least the determined actual values ​​of the first and second variables, wherein the estimating comprises identifying a future rotor speed based on the determined actual values ​​of the first and second variables, and wherein the blade pitch drive system (68) adjusts the angle of attack of the at least one rotor blade (22) for aerodynamic braking of the rotor (18) based on the result of the estimation.

The present invention relates to the technical field of wind turbine units. Specifically, it relates to an emergency yaw control system in the case of power loss of a wind power generating unit. The original circuit of the fan is respectively connected to one end of switch Q1, one end of switch Q2, one end of switch Q3, and one end of switch Q4. The other ends of switch Q1, switch Q2, switch Q3, and switch Q4 are respectively connected to the tower base, the 1st interface of the step-down to DC transformer, and the input end of relay K1. The 3rd interface of the step-down to DC transformer is connected to the positive pole of diode Z1. The 2nd interface of the step-down to DC transformer, the output end of relay K1, the negative pole of diode Z1, and the 4th interface of the step-down to DC transformer are respectively connected to the original circuit of the fan. The emergency power supply is connected to the tower base through a quick plug, and the tower base is connected to the second wind turbine unit.

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 application discloses a wind turbine anti-over-speed control method and system based on a variable pitch motor torque, which comprises the following steps: obtaining the variable pitch motor torque of the wind turbine, and identifying the over-speed working condition of the wind turbine by using the variable pitch motor torque; setting a variable pitch angle table corresponding to the variable pitch motor torque according to the difference between the variable pitch motor torque in the normal working condition and the over-speed working condition of the wind turbine; collecting real-time variable pitch motor torque signals, filtering the collected variable pitch motor torque signals, searching the variable pitch angle table through linear interpolation, and obtaining the corresponding minimum pitch angle; and using the minimum pitch angle to control the lifting of the wind turbine blade angle and reduce the generator speed, so as to realize the generator anti-over-speed control of the wind turbine. The application can identify whether the wind turbine is over-speed by using a non-rotational speed signal, can avoid the problems of the existing technologies such as transmission chain slip or low measurement value, and can reduce the load of the unit components in the over-speed working condition, and has a good reducing effect on the limit load of the blades, the rotating hub, the fixed hub and the tower.

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.

A control device for controlling a wind turbine (1) is described, the wind turbine including a rotor (3) and at least one blade (6) rotatably mounted to the rotor (3). The control device includes: detecting means (9) configured to detect the amount of the bending moment of the blade; and a varying element having an input part and an output part, wherein the input part is configured to receive the detected amount of the bending moment of the blade (6), and the output part is configured to output a response to a difference in the detected amount of the bending moment of the blade (6). The control device is configured to control the wind turbine (1) based on the response.

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.

Emergency device for preventing damage to a wind turbine, characterized in that it comprises: a gear assembly (100), the gear assembly (100) comprising a wind turbine (101), a sector-shaped rotating plate (102) connected to the wind turbine (101), a connecting shaft (103) cooperating with the sector-shaped rotating plate (102), and a speed sensor for detecting a speed of the wind turbine (101); a separating assembly (200), the separating assembly (200) comprising a motor (201), a movable block (202) connected to the motor (201), a limiting table (203) cooperating with the movable block (202), an arcuate abutment plate (204) connected to the movable block (202), and a resilient connecting element (205) connected to the connecting shaft (103); the rotational speed sensor controlling a rotational direction of the motor (201) depending on the detected rotational speed, wherein, when the motor (201) rotates in a first direction, the movable block (202) is driven so that that it moves along the limit table (203) in the direction of the connecting shaft (103), and the arcuate abutment plate (204) separates the sector-shaped rotary plate (102) from the connecting shaft (103) under the action of the resilient connecting element (205); wherein, when the motor (201) rotates in a second direction, the movable block (202) is driven to move along the limit table (203) in a direction away from the connecting shaft (103), and the arcuate abutment plate (204) connects the sector-shaped rotary plate (102) to the connecting shaft (103) under the action of the resilient connecting element (205).

The application relates to a system for accelerating turbine rotation. The application is characterised in that on the upper end of an elongated rotor shaft there is an irreversible transmission (3) installed, with which there is connected a gearmotor (4) with an electric motor connected by a unidirectional clutch (6) with a pneumatic motor (7) which, in turn, is coupled with a magnetic motor (8).

The invention belongs to the technical field of wind power generation equipment, and particularly relates to a wind power generation automatic locking impeller lock which comprises an impeller body and a shell used for installing the impeller lock, a supporting plate is fixedly connected to the inner wall of the shell, and a micro generator is fixedly connected to the upper surface of the supporting plate. The wind power generation impeller lock not only has the functions of automatic locking and active speed reduction, can prevent the blades from being directly locked in a high-speed rotating state and reduce impact force at the locking moment, but also has an efficient and convenient locking effect, the use reliability of the impeller lock is greatly improved, and the service life of the impeller lock is prolonged. Meanwhile, the impeller lock also has a wind blade angle adjusting function, so that the damage of strong wind load to the small-sized wind driven generator is reduced, and the use safety of the small-sized wind driven generator in a field complex strong wind environment is also comprehensively improved; the requirements of meteorological monitoring, communication equipment, scientific investigation instruments and the like on continuous power supply in field exploration and scientific research activities are fully met.

The invention provides a pitch angle compensation method and device for blades of a wind turbine generator, a medium and a product. The method comprises the steps that real-time rotating speed data of a generator are collected in real time according to a sampling period; calculating a real-time rotating speed deviation and a real-time rotating speed deviation change rate according to the real-time rotating speed data; according to the real-time rotating speed deviation and the real-time rotating speed deviation change rate, an optimal compensation variable pitch rate table is inquired, and the corresponding optimal compensation variable pitch rate is found; and if the compensation variable pitch rate is larger than the set threshold value, the compensation variable pitch rate is converted into a compensation pitch angle, the overspeed prevention function of the wind turbine generator is triggered, and the wind turbine generator adjusts the pitch retracting angle according to the compensation pitch angle. Whether the wind turbine generator set faces the problem that the rotating speed of the generator is too large or not is judged through the two aspects of the current generator real-time rotating speed deviation and the real-time rotating speed deviation change rate, the optimal compensation pitch angle is given in advance to command the wind turbine generator set to increase the pitch retracting angle, overspeed of the wind turbine generator set can be effectively prevented, and the rotating speed of the generator is kept stable.

The utility model provides a wind generating set safety chain tester and a rotating speed overspeed monitoring system, comprising a tester body which is provided with a power interface, a touch display screen, a first rotating speed interface, a second rotating speed interface and a power switch, and the first rotating speed interface and the second rotating speed interface are both used for connecting the rotating speed overspeed monitoring system; a gear ratio setting window, a first rotating speed setting window, a second rotating speed before-transformation-ratio setting window, a second rotating speed after-transformation-ratio setting window, a starting key and a synchronous key are arranged in the touch display screen; and the functional assembly is arranged in the touch display screen and is used for setting operation parameters. Due to the fact that the gear ratio setting window, the first rotating speed setting window, the second rotating speed before-transformation-ratio setting window and the second rotating speed after-transformation-ratio setting window are arranged on the tester, when all parts of the safety chain system of the wind generating set are tested, the rotating speed overspeed monitoring part in the safety chain system of the wind generating set can be effectively tested.

The embodiment of the present invention discloses an overspeed protection device for a wind turbine generator set, a detection method and a wind turbine generator set. The overspeed protection device for a wind turbine generator set includes: an overspeed trigger assembly and at least two clutches; the clutch is arranged between the pitch motor and the pitch gearbox of the wind turbine generator set, and the clutch is used to transmit or cut off the power input from the pitch motor to the pitch gearbox; the first end of the overspeed trigger assembly is fixed to the rotation center of the hub, and the second end of the overspeed trigger assembly is elastically retractable relative to the first end; when the hub rotates at an overspeed, the second end of the overspeed trigger assembly extends out to hit the clutch to cut off the power input from the pitch motor to the pitch gearbox. This solution is not affected by electrical signals and electrical circuits, and can reliably protect the wind turbine generator set from overspeed in the extreme case where all electrical circuits fail, thereby greatly enhancing the reliability of overspeed protection of the wind turbine generator set.

The invention relates to a method for controlling a wind turbine (100) which has rotor blades (108) with adjustable blade angle and can be operated at a variable speed using a speed control system. The speed control system is configured to regulate the speed to a variable setpoint, comprising the steps of evaluating a test criterion to predict an impending overspeed, predicting an overspeed (nu) as a function of the at least one test criterion, and adjusting the speed control system when an overspeed (nu) has been predicted. A solution is proposed that avoids excessive increases in rotor speed even during strong increases in wind speed. In particular, reaching an overspeed that leads to shutdown is to be avoided without excessively increasing the operating loads.