164results about How to "Reduce fatigue load" patented technology

A method and system for controlling a windpark power plant includes a central processing and control unit operatively coupled to wind turbines in the windpark to receive data from and selectively transmit at least one of data and control signals to each wind turbine, to reduce fatigue loads and comply with power limits.

A wind turbine is presented where the operation lifetime of the main bearing is extended by relieving the main bearing by reducing the mean bending moment on the bearing by means of individual pitch control of the blades of the rotor so as to create an aerodynamic mean tilt moment on the rotor by means of aerodynamic forces on the blades, the tilt moment at least partly counteracting the bending moment caused by the overhang load forces on the main bearing from the gravitational pull on the rotor mass.

The invention provides an independent pitch control method for a large wind turbine, which comprises a coordinated pitch control process: detecting the rotation speed omega g of a motor, subtracting the reference rotation speed omega ref with the detected rotation speed omega g to obtain the rotation speed deviation delta omega; by the PI control, obtaining a coordinated pitch angle beta c expected to be output by the coordinated pitch control; the method also comprises a deviation pitch control process: 1) detecting the load (Mz1, Mz2 and Mz3) of the root part of a blade and an impeller azimuth signal psi, and making the Park conversion of the load (Mz1, Mz2 and Mz3) of the root part of the blade to obtain load components of Mtitl and Myaw; 2) obtaining the outputs of beta1 and beta2) by being controlled by the PI controller respectively; 3) by the PARK inverse conversion, obtaining the deviation pitch angles (beta1', beta2' and beta3') expected to be output by the deviation pitch control; and 4) obtaining the three blade expecting output pitch angles in the independent pitch control so as to control the action of the servo motor to realize the pitch control. The method can effectively avoid the appearance of the bigger fatigue loads.

The invention discloses a radar-assisted load optimizing control method for a large wind turbine unit. The radar-assisted load optimizing control method comprises the following steps: 1) carrying out radar scanning: measuring air speed, at different positions of different height layers of a wind wheel windward side by utilizing a laser radar detecting system; 2) analyzing aerodynamic characteristics of paddles of the wine turbine unit; 3) carrying out self-adaptive dynamic feed-forward regulation on a fan by utilizing predicated air speed detected at the next moment via the laser radar detecting system so as to realize controlling of a pitch angle, torque and rotational speed of a power generator, thereby optimizing fan load at the next moment. According to the radar-assisted load optimizing control method, the self-adaptive dynamic feed-forward regulation is carried out on a fan by utilizing predicated air speed detected at the next moment via the laser radar detecting system so as to realize controlling of the pitch angle, the torque and rotational speed of the power generator, so that faster response can be made for an extreme wind condition, and therefore, extreme load is avoided; and the capacity of predicating wind condition changes of a control system of the large wind turbine unit is improved, and optimizing control is carried out on a wind turbine in advance.

The embodiment of the invention provides a control method and device of a wind generating set and a wind power plant group control system. The control method comprises the steps that when the wind generating set is in the standby state, information of the forecast starting wind direction is obtained, and the initial yawing position of the wind generating set is adjusted according to the starting wind direction; and/or, the power generator rotation speed of the wind generating set is obtained, and if the power generator rotation speed is in the resonance rotation speed range, the set value of the power generator rotation speed is set as the lower limiting value of the resonance rotation speed range. By the adoption of the technical scheme, the yawing time during starting of the wind generating set is shortened, and/or, the power generator rotation speed of the wind generating set avoids the resonance rotation speed set value, and the vibration value and the fatigue load of the wind generating set are decreased.

The invention discloses a decoupling control method for variable pitch control and torque control of a large wind turbine unit. The large wind turbine unit consists of a variable pitch control system and a torque control system. During the operation of a fan, a pitch PID (Proportion Integration Differentiation) controller and a torque controller operate simultaneously, wherein variable pitch control is implemented by the pitch PID controller, and torque control is implemented by the torque controller. The variable pitch control system is formed by a pitch deviation calculating module, a pitch PID controller module, a pitch amplitude limiting module and the like by means of combination, and the torque control system is formed by a torque deviation calculating module, a torque PID controller module, a torque amplitude limiting module and the like by means of combination. The decoupling control algorithm provided by the invention realizes decoupling algorithms of the pitch controller and the torque controller by amending controller software without adding extra hardware, so that the cost of the fan is reduced.

The invention presents a method for operating a horizontal axis wind turbine (1), the wind turbine comprising a tower (2) and a rotor (5) with at least one rotor blade (51), the rotor being connected to the tower, and being adapted to drive a generator (6) connected to a utility grid (8), wherein a pitch angle (A) of each rotor blade is adjustable, the method comprising detecting (905, 911), when the wind turbine is in an idling power producing situation in relation to the utility grid, a tower oscillation, and controlling (907, 913, 914, 915), when the wind turbine is in the idling power producing situation, the pitch angle of the at least one rotor blade so as to produce aerodynamic forces counteracting the detected tower oscillation.

Method for controlling at least one adjustment mechanism of a wind turbine, said method comprising the steps of: establishing at least one load or operational value of the wind turbine, choosing a combination of at least two control strategies from a set of different control strategies based on the established at least one load or operational value, and applying the chosen combination of control strategies to control said at least one adjustment mechanism. The invention also relates to a wind turbine and a wind park.

The invention discloses an independent variable pitch control method of a wind power generation system. The independent variable pitch control method of the wind power generation system is characterized in that a control system adopted in the control method comprises two control closed loops, namely a balanced load control closed loop and an unbalanced load control closed loop, are respectively used to deal with a load balanced situation and a load unbalanced situation of a wind turbine. On the condition of balance, the balanced load control closed loop is used to eliminate load on blades and on a fixed portion of the wind turbine; and when the unbalanced load is detected, the unbalanced load control closed loop is started to eliminate fatigue load on a hub and the fixed portion of the wind turbine. Under the conditions that the wind turbine load is balanced or unbalanced, the independent variable pitch control method of the wind power generation system not only reduces the load on the blades, the load of the fixed portion of the wind turbine is also reduced greatly.

A thermal machine includes a hot gas channel; a shell bounding the hot gas channel; a cooling shirt surrounding the shell; and a cooling channel disposed between the shell and the cooling shirt and configured to convection cool the hot gas channel with a cooling medium, wherein the cooling shirt includes at least one local divergence in the guidance of the cooling medium so as to compensate for non-uniformities in at least one of a thermal load on the shell and a flow of the cooling medium in the cooling channel.

The invention discloses a large wind turbine unit individual pitch control method based on an RBF neural network. The method includes the following steps that wind wheel rotating speed signals are collected so that a unified pitch angle and electromagnetic torque can be obtained; three paddle root bending moments and paddle azimuth angles of a wind turbine unit are calculated; the three paddle root bending moments are subjected to Coleman coordinate transformation, so that a pitching bending moment and a yawing bending moment are obtained; the self-adaption rate of the neural network is derived through self-adaptive control of the RBF neutral network, the weight of the neutral network is adjusted in an on-line mode so as to improve the paddle root bending moment of an individual pitch control system, and then the weight is converted into the optimized pitch angles of different paddles through Coleman inverse transformation; and the unified pitch angle plus the optimized pitch angles obtains an individual pitch control pitch angle, and the optimized pitch angles are fed into a variable pitch execution unit so that individual pitch control can be completed. According to the large wind turbine unit individual pitch control method based on the RBF neural network, individual pitch control can be realized quickly, so that the working efficiency of a variable pitch servo system is improved, controlling cost is low, and the service life of the wind turbine unit is prolonged.

The invention provides segmented blades, a method of connecting the segmented blades and a wind turbine generating unit. The segmented blades comprise a first blade section provided with a first mainbeam, a second blade section provided with a second main beam and outer skin, wherein the first blade section is close to the blade root side and the first main beam comprises a first main body portion arranged in the first blade section and a first locking portion extending toward a direction, far from a blade root, from the end portion of the first main body portion, and the height of the firstlocking portion is gradually reduced along the direction far from the blade root; the second blade section is close to the blade tip side, the second main beam comprises a second main body portion arranged in the second blade section and a second locking portion extending toward a direction, close to the blade root, from the end portion of the second main body portion, and the height of the secondlocking portion is gradually increased along the direction close to the blade root; the second locking portion is locked into the first locking portion; and the outer skin wraps a gap between the first blade section and the second blade section. According to the segmented blades provided by the invention, the weights of the blades are not increased substantially, and the blades are connected withhigh reliability.

The invention discloses a blade deicing system of a wind power generation unit. The blade deicing system comprises an air heating and outputting device arranged at the top end of a tower drum of the wind power generation unit, a multi-through connector arranged in a hub of the wind power generation unit and blade ventilation pipelines arranged in corresponding blades of the wind power generation unit; an air outlet of the air heating and outputting device communicates with one port of the multi-through connector through a rotary connector; and the other joints of the multi-through connector communicate with tail ends of the corresponding blade ventilation pipelines. By adopting the blade deicing system provided by the invention, the risk of mounting dropping is avoided, fatigue load of a relative component of a fan is reduced, the reliability is improved, and the service life of the component is prolonged; without arranging a hub sliding ring, the cost is remarkably lowered; the heating efficiency is improved, and in addition, as the fan can work both when stopping and running, the cost is low; and the risk of damage by lightning is avoided, the reliability is high, and the maintenance cost is low. The invention also discloses the wind power generation unit comprising the blade deicing system.

The invention discloses a multi-rotor wind generating system with connecting rods, which comprises a tower 1, wind turbines, two slewing bearings 2, a framework 4, beams 5 and the connecting rods 8. A rotary driving device A is arranged on the top of the tower; a rotary driving device B is arranged in the middle of the tower; inner rings of the slewing bearings of the rotary driving device A and the rotary driving device B are fixed on the tower; the framework is fixedly connected to the outer rings of the slewing bearings of the rotary driving device A and the rotary driving device B; one end of each beam is connected with the framework; one end of each connecting rod is connected with the middle part of each beam, and the other end of each connecting rod is connected with the framework; wind turbines are fixedly connected with the beams; each wind turbine comprises a wind wheel 6 and a cabin 7; and the power of each wind turbine is 0.5-500kW. The multi-rotor wind generating system has the advantages that: blades have long service life, the occupied area is small, installation and maintenance cost is low, the reliability is high, the application range is wide, a slewing bearing or a rotary driving device in the cabin is eliminated, the bearings bear small force, and the beams bear small force.

The invention relates to a wind turbine generator pitch angle control method which comprises the following steps: establishing an ELM based effective wind speed estimation model; obtaining effective wind speed information and corresponding output data within a period of time to train the effective wind speed estimation model; obtaining a feedback control signal: establishing a wind turbine generator digital model; defining an adjusting error, solving dynamic characteristics and a preliminary expression of a feedback control signal; estimating uncertainty and interference term of the mathematical model of the wind turbine generator; carrying out conversion treatment on the preliminary expression to obtain the feedback control signal; obtaining a feedforward control signal: and obtaining thepitch angle signal in the effective wind speed information and the unit corresponding output data within a period of time, and training the wind turbine generator dynamic nonlinear wind speed-pitch angle relation model, wherein the model can give the feedforward control signal on line in real time. With adoption of the wind turbine generator pitch angle control method, the situations that the load optimization effect of the traditional pitch angle controller is poor caused by inaccurate feedforward pitch angle information and the calculation is complicated caused by a unit linear model are avoided.

The invention discloses a thrust reduction control algorithm of a wind generating set. The algorithm includes the steps that first, the cabin acceleration of the wind generating set is measured in real time through a sensor; then a corresponding minimum pitch angle is obtained through a look-up table method according to the measured cabin acceleration; and afterwards, the minimum pitch angle value is input to a variable pitch controller of the wind generating set to be compared with the minimum pitch angle value set by the variable pitch controller, the maximum value is taken as a novel minimum pitch angle limit value of the controller, in other words, the thrust borne by the set can be changed by changing the minimum pitch angle limit value of the controller in real time, and thus load optimizing control of the wind generating set based on the cabin acceleration can be realized. By the adoption of the control algorithm, wind wheel thrust of the set can be effectively reduced, and therefore blade, hub and tower loads are lowered, and performance of the wind generating set is improved comprehensively. Hence, the control algorithm has a wide application prospect.

The embodiment of the invention provides a blade adjusting method, device and equipment for a wind power generator set and a storage medium. The method includes the steps that the blade azimuth angleof the current wind power generator set and the blade azimuth angle of an upper wind side wind power generator set are obtained; the changing trend of the azimuth angle difference value of the blade azimuth angle of the current wind power generator set and the blade azimuth angle of the upper wind side wind power generator set is determined; and the pitch angle of the current wind power generatorset is adjusted according to the changing trend of the azimuth angle difference value. By means of the blade adjusting method, device and equipment for the wind power generator set and the storage medium in the embodiment, the difference value between the blade azimuth angle of the current wind power generator set and the blade azimuth angle of the upper wind side wind power generator set is usedfor conducting blade adjusting in advance so that when wind of the upper wind side wind power generator set reaches the current wind power generator set, blade adjusting is completed correspondingly on the current wind power generator set in advance or completed correspondingly on the wind power generator set exactly, the matching degree of the capability of wind energy capturing of the wind powergenerator set and incoming wind can be improved, and the overspeed phenomenon of the wind power generator set can be reduced when the wind speed changes greatly.

The invention discloses a wind turbine generator active regulation method based on wind speed advance measurement. The method comprises the following steps of 1, establishing a cost function accordingto an active regulation optimization objective of a wind generating set; 2, establishing a wind generating set state prediction equation by using a wind speed and wind generating set model in advance; 3, solving the cost function by utilizing a prediction state value to obtain a sequence of the optimal given pitch angle and a sequence of a given torque; and 4, taking the sequence of the optimal given pitch angle of the wind generating set and the first element of the sequence of the given torque as an output of a controller. Under the high-speed wind condition, when the active power output ismet to be equal to the target power, the action of a variable-pitch mechanism can be reduced, the fatigue load of the variable-pitch system is reduced, and the maximum power tracking operation is realized under a low-speed wind condition. In each prediction step size, only one of a pitch angle sequence or a torque sequence is adopted as a candidate limited control set, so that the operation amount of the controller is greatly reduced, and the engineering applicability is enhanced.