37 results about "Tower shadow" patented technology

In a wind turbine, an open loop control algorithm for incrementally or positively adjusting the pitch angles of individual rotor blades may be used to increase spacing between the base of the turbine tower and an approaching blade tip. As each rotating blade passes in front of the tower base, a minimum clearance distance may be assured to avoid blade tip strikes of the base. In accordance with at least one embodiment of the control algorithm, as each blade approaches the tower base, it may be feathered to reduce its power loading, and to facilitate increased clearance beyond the normal unloading or feathering produced by the so-called tower shadow effect. To offset resultant loss of torque, the remaining blades may be correspondingly pitched toward power, i.e. into the wind, to balance and/or smooth out the overall rotor torque curve, and thus to avoid torque ripples.

The invention discloses an individual variable pitch control method for a wind generating set applicable to no-load measurement, and belongs to the technical field of wind generating variable pitch control. The method comprises the following steps: (1) correcting and measuring wind speed by using a method of combining theoretical correction and error identification; (2) calculating a blade load prediction value under the influence of wind shear and tower shadow effects; (3) allocating and calculating individual variable pitch control pitch angles. According to the method, load control can be performed through individual variable pitch without arrangement of a blade load sensor, so that the service life of the wind generating set is prolonged, and the failure rate is reduced; during load calculation, the wind speed correction, the wind shear effect and the tower shadow effect are taken into consideration, so that the load calculation is more accurate; according to the variable pitch speed and frequency of a variable pitch execution mechanism, a pitch angle allocation method is provided, so that the rapidity and real-time performance of control are ensured; each blade pitch angle is obtained by summing pitch angle control quantity and load optimal compensation quantity which are output by a unified variable pitch controller through load prediction, so that the power control is ensured, and meanwhile, the load control is realized.

The invention provides a method for constructing a wind power plant frequency domain equivalent model. The wind speed at a certain point in a wind power plant space is used as an input quantity, the total active power of a wind power plant is used as an output quantity, the overall frequency domain equivalent model of the wind power plant is built, the model is divided into a positive wind speed channel and a negative wind speed channel, the positive wind speed channel represents and meters the energy transformational relation of the wind power plant after time-lag, wake flow, a tower shadow, wind shear and other space influence factors, and the negative wind speed channel represents the total cut-down function of each wind power generation set pitch angle controller in the wind power plant on excess wind power. The method avoids the difficulty of accurately building the models of the time-slag, the wake flow, the tower shadow, the wind shear and other space influence factors of the wind power plant in a time domain, and the influence of various space influence factors and the wind power generation set pitch angle controllers on the wind power plant energy transformation function is accurately metered in the equivalent model obtained through measured data in a frequency spectrum mode.

The invention discloses an individual pitch control system and method for a wind driven generator. The system comprises a wind driven generator unit, a state observer and a disturbance accommodating controller; the state observer and the disturbance accommodating controller are additionally arranged in the system according to control input and interference input, the gain coefficients Gx and Gd are adjusted according to the specific circumstances to control the influences of errors and the interference input, and finally individual pitch control is achieved. According to the individual pitch control system and method for the wind driven generator, an individual pitch control strategy based on a linear quadratic regulator and a disturbance accommodating control technology is adopted, the problems that wind wheels of the wind driven generator are loaded are solved, the operation life of the wind driven generator is prolonged, the vibration load of the wind driven generator is effectively reduced, and the purpose of vibration reduction is well achieved; meanwhile, the disturbance accommodating control technology is introduced to inhibit or reduce the influences of the wind speed, the turbulent flow, the wind shear and tower shadow effects and the like on the wind driven generator, and the robustness of the system is improved.

The invention relates to a fan linkage pitch system, which is applied to the manual and power-driven linkage pitching for a fan. The fan linkage pitch system comprises a blade group and a pitch system which is connected with a machine head hub, and has the advantages of simple structure, low cost, excellent stability and high linkage precision. A main control system signal of the fan is used for instructing a power-driven tension system to control a blade pitching angle, and the active pitching of a blade is realized; and by the adoption of the multi-free-degree rotation of a joint bearing, the highly precise coordination of the waist hole of a linkage disc and the outer circle of the joint bearing, and the movement capability of the joint bearing in the waist hole, the high synchronization among blades of an impeller during the pitching of blades is achieved, and the problem that non-synchronization of pitching caused by non-uniform pitching force of the blades due to wind shearing, down-wind tower shadow effect and the like is solved. According to synchronized pitching and timely active pitching, the operation stability of a set is effectively improved, electricity generation is improved, the service life of the set is prolonged, and the operation safety of the set is guaranteed.

The invention discloses a wind power grid-connected low-frequency oscillation suppression method based on broadband and improved active disturbance rejection control, and belongs to the field of powersystem stabilization and control. The method comprises the following steps: building an equivalent two-region system model of fan grid connection and a direct-driven wind power plant; obtaining a transfer function of inter-region tie line power fluctuation caused by wind power mechanical power fluctuation, considering the influence of wind shearing and tower shadow effects to enable the direct-driven wind turbine generator to become a forced power oscillation disturbance source, and obtaining a frequency band capable of exciting low-frequency oscillation between two equivalent regions of thedirect-driven wind power plant; designing a disturbance estimation module of the ADRC according to the frequency band, using the ADRC for replacing a traditional fan side q-axis current inner loop controller, thereby achieving the real-time compensation for the fan power low-frequency disturbance quantity, and achieving the suppression of wide-frequency-band low-frequency oscillation. The method is low in cost, good in inhibition effect and capable of adapting to changes of operation conditions.

The invention relates to a horizontal-axis wind turbine tower frame based on fractal science. Fractal structures are arranged on the tower frame and are third-order Sierpinski triangles. The tower frame is a cone cylinder type tower frame. A tower shadow effect can be effectively weakened based on the fractal structures of the third-order Sierpinski triangles to reduce the influence of an incoming flow on downstream wind turbines. The Karman vortex street phenomenon can be weakened by adopting the fractal structures, resonance caused by a Karman vortex street is reduced, and the stability of the wind turbine is improved. By the adoption of the wind turbine tower frame provided with the fractal structures, the material usage amount can be decreased to some degree, and the costs are saved.

The invention relates to an electromagnetic propeller-switching mechanism for wind power generators and belongs to the field of wind power generation. The invention is characterized in that a motor wound stator and a magnet steel rotor is made up into a permanent magnet step motor; the stator and rotor in the permanent magnet step motor are respectively connected with an internal rotary support and an external rotary support, so as to form a support and rotation system for the permanent magnet step motor. The internal and external rotary supports are respectively connected with vanes and hubs through bolts to form a propeller-switching mechanism. The invented propeller-switching system is not arranged with gear meshing, for which it is not possible to result in gear wearing and damage; meanwhile, the propeller-switching system has advantages of neither gearbox oil leakage nor damping, and easy maintenance. Braking and quick response are maitained through permanent magnet magnet steel and DC current without contact friction or vibration; meanwhile, the invention can effectively resolve tower shadow phenomenon.

The invention discloses a truss-structured tower which is used for wind power generation, and belongs to horizontal-axis wind turbine generators. The truss-structured tower comprises a tower root connected with a foundation, a tower top connected with a cabin, and a lifting device for lifting personnel and equipment. The truss-structured tower is characterized in that a truss structure is composed of rod pieces which comprise a thick vertical rod, and the lifting device is arranged in the thick vertical rod. The truss-structured tower solves the problem that a conventional truss-structured tower has the safety problem of climbing a high tower in the open; and meanwhile, the truss-structured tower has the advantages of light weight, small wind resistance and low tower shadow effect, is detachable in transportation and is convenient for adopting downwind wind wheels, so that the generating cost can be reduced.

The invention provides a method for restraining wind shear tower shadow pulsation of a wind power system to overcome the technical defects in an existing wind power system, and pulsation amplitude is effectively reduced by torque compensation and control. A wind shear tower shadow signal is extracted, the real wind field wind shear tower shadow signal creatively replaces a signal derived from a theoretical formula, influence on the signal from factors such as terrain and interference is eliminated, and torque and power pulsation of a double-fed wind generation set caused by the wind shear tower shadow effect are effectively restrained. The method has the advantages that torque and power pulsation caused by the wind shear tower shadow effect are remarkably restrained, electromagnetic torque and power pulsation quantity caused by the wind shear tower shadow effect are remarkably decreased, a mechanical part can be effectively protected, the service life is prolonged, and reliable operation of the wind power system is ensured to the maximum extent, and the quality of electric energy transmitted to a power grid is improved.

The invention discloses a real wind regime and wind power generation simulation device with a wind shear and tower shadow effect. The real wind regime and wind power generation simulation device comprises a simulator control system and an electromechanical servo system, the simulator control system comprises a software system and a hardware system, the simulator control hardware system comprises an industrial personal computer and a data collecting card; the simulator control soft system comprises a wind speed generation model, a draught fan tip speed ratio estimation model, a draught fan pitch angle control model, a wind energy utilization coefficient model, a wind shear and tower shadow effect compensation model, a wind driven generator drive chain model and an induction generator model,the electromechanical servo system comprises a programmable controller, a direct current bus power module, a frequency conversion driving unit, a frequency conversion power generation unit, a drivingmotor, a loading motor, a rotating speed torque meter and a test bed. The real wind regime and wind power generation simulation device is used for the simulation of wind power generation process andresearch and application of wind power generation control strategy under laboratory environment.

The invention discloses a wind-driven generator tower drum and a tower footing yawing type wind-driven generator unit with the same. The cross section of the tower drum is of an oval structure; the wind-driven generator unit is fixedly installed at the top of the tower drum; the length axis of the oval section of the tower drum is maintained parallel with the main axis of the unit when the inclination angle of a main machine of the unit is 0 degree; a yawing system of the unit is installed at the tower footing position of the tower drum; and in the process of yawing wind aligning of the unit,a cabin system of the unit, an impeller, the tower drum and tower drum connecting bolts can rotate as a whole around the central axis of the tower drum. Through the arrangement of the tower drum whichis of an oval structure, under the condition that no change is made to preparation materials of the tower drum and the bending resistance section coefficient and tower drum load bearing requirementsare met, the weight and cost of the tower drum can be effectively lowered, the economic benefit is good, the tower drum is particularly applicable to downwind direction wind-driven generator units, the tower shadow effect of the units can be effectively improved, and the generation performance of the units can be improved.

The embodiment of the invention discloses a data processing method and device. The method and device are used for revising target data to be revised in wind measurement data according to influence factors, and therefore the validity and accuracy of the wind measurement data are improved. The method according to the embodiment comprises the steps of obtaining the wind measurement data; determiningthe target data to be revised in the wind measurement data according to a tower shadow parameter table, wherein the tower shadow parameter table includes parameters of the influence of a wind measurement device on each wind condition; determining the influence factors corresponding to the target data according to the tower shadow parameter table, wherein the influence factors are the parameters ofthe influence of the wind measurement device on each wind condition; revising the target data according to the influence factors.

The invention provides a pitch change control system for a tidal current energy generator set. The pitch change control system comprises at least two pitch change control units connected in parallel;each pitch change control unit mutually independently controls a corresponding permanent magnet synchronous motor, and correspondingly receives an instruction from an external tidal current energy generator set main control device and executes the corresponding pitch change operation according to the corresponding instruction; an Ethernet switch is arranged in one of the pitch change control units, the Ethernet switch can be in communication with the tidal current energy generator set main control device, and the other pitch change control units are connected to the Ethernet switch in a communication mode. According to the pitch change control system, the pitch change system can undergo control program upgrading, fault diagnosis, resetting and other remote maintenance under the conditionthat the generator set is not lifted beyond the water surface, a lot of workload and fault shutdown time of the operation that the generator set is lifted beyond the water surface are avoided; a pitchchange action in a large range from 0 degree to 90 degrees and 180 degrees to 270 degrees is achieved, and then the generator set can generate electricity during a flood phase and an ebb phase; and the independent pitch change is realized, and the influence of the tower shadow effect is reduced.

The invention discloses a wind wheel equivalent wind speed calculation method considering wind shear and a tower shadow effect, and belongs to the technical field of wind power generation. The method comprises the following steps: step 1, establishing a wind shear effect calculation model; 2, establishing a tower shadow effect calculation model; 3, establishing a wind shear and tower shadow effect joint calculation model according to the models in the step 1 and the step 2; and 4, based on an equivalent power principle, comprehensively considering wind shear, a tower shadow effect and operation characteristics of a wind turbine generator, constructing a wind wheel equivalent wind speed mathematical model based on equivalent power and considering the wind shear and the tower shadow effect, and calculating a wind wheel instantaneous equivalent wind speed and a wind wheel average equivalent wind speed. The method provided by the invention covers the power loss caused by actual power control deviation, can effectively reflect the change rule of the equivalent wind speed of the wind wheel under different power control stages and actual control effects, and is more in line with the actual operation characteristics of the wind turbine generator.

The invention discloses an offshore scanning type laser radar wind measuring device and method. The device comprises a tower climbing operation platform, a sliding rail, a support, a radar cabin, a scanning type laser radar wind measuring instrument, a control system and a power system. The sliding rail is arranged on the tower climbing operation platform; the sliding rail is annular and concentric with a fan tower; the scanning type laser radar wind measuring instrument is arranged in the radar cabin; the face, away from the fan tower, of the radar cabin is open; the scanning type laser radarwind measuring instrument and the control system are arranged in the radar cabin; the power system is arranged on the radar cabin; and the output end of the power system is connected with the slidingrail. The annular sliding rail is erected on the basis of an existing tower climbing operation platform of the offshore wind turbine generator, and the cabin provided with the scanning type laser radar wind measuring instrument moves on the sliding rail through roller wheels at the tail end of the support, so that measurement of the wind speed and the wind direction of the space with different heights in the 360-degree range through the laser radar is achieved, and the measurement is not affected by the cabin fixing orientation and the tower shadow effect of a tower drum and is not affected by vibration and shaking of a fan cabin.

The invention discloses a floating fan tower tube scale model capable of simulating tower shadow effects and yaw errors, and relates to the field of floating fan scale model tests. The floating fan tower tube scale model comprises a tower bottom six-component meter, a tower bottom connecting component, a conical tower tube component, a yaw adjusting component and a tower top six-component meter, wherein the lower end surface of the tower bottom six-component meter is fixedly mounted on a floating platform; the upper end surface of the tower bottom six-component meter is fixedly connected with the lower part of the tower bottom connecting component; the upper part of the tower bottom connecting component is fixedly connected with the lower end part of the conical tower tube component; the upper end part of the conical tower tube component is fixedly connected with the lower part of the yaw adjusting component; and the upper part of the yaw adjusting component is fixedly connected with the lower end part of the tower top six-component meter. Through the implementation of the floating fan tower tube scale model disclosed by the invention, the tower shadow effects and the yaw errors experienced by a real offshore floating fan can be accurately and efficiently simulated under the premise that other performance requirements of a scale model pool test are prevented from being influenced; and furthermore, the tower tube loads under various working conditions of the floating fan can be completely monitored.

The invention relates to an anemometer tower wind measurement data processing method and a device based on a wind direction sector. The method comprises the steps of collecting wind speed data of twochannels at the same height of an anemometer tower; calculating the ratio of the wind speeds of the two channels falling in the same sector at the same moment, counting each ratio of each sector, andcalculating a tower shadow effect index for all the sectors; and if the tower shadow effect index is greater than a set tower shadow effect threshold, processing the corresponding two-channel wind speed data in each sector. According to the method, quantitative analysis is carried out on the significant degree of the influence of the tower shadow effect on the anemometer tower anemometry data, theanemometry data can be processed only when the influence of the tower shadow effect on the anemometry data exceeds a certain degree, errors caused by improper processing of the tower shadow effect are avoided, and the authenticity of the anemometry data is guaranteed.

An embodiment of the invention discloses a data processing device. The data processing device is used for revising target data to be revised in wind observation data according to influencing factors,and effectiveness and accuracy of the wind observation data are improved. The data processing device comprises a processor, a memory, inputting and outputting equipment and a bus; the processor, the memory and the inputting and outputting equipment are separately connected with the bus; the inputting and outputting equipment is used for acquiring the wind observation data; the processor is used for determining the target data to be revised in the wind observation data according to a tower shadow parameter table which comprises parameters of influences of wind observation equipment on variouswind conditions; the influencing factors which correspond to the target data are determined according to the tower shadow parameter table, and are parameters of influences of the wind observation equipment on various wind conditions; and the target data are revised according to the influencing factors.

The invention discloses a downwind aerogenerator gyrodamping and locking mechanism which mainly comprises an anemoscope, a gear case, a motor, a small belt wheel, a big belt wheel, a synchronous belt and a pedestal flange, wherein the motor is connected with the small belt wheel by the gear case, the small belt wheel is connected with the big belt wheel by the synchronous belt, the big belt wheel is connected and fixed with the pedestal by bolts, a tension wheel is arranged on the supporting frame of the gear case, and the supporting frame is provided with a spring matched with the tension wheel. Rotational resistance is relatively large under the condition of no power supply, and speed change between the transmission of the gear case and the synchronous belt increases torque moment so as to achieve good damping effect. The invention has simple operation, and solves the problems of frequent swinging of a generator and unstable power output caused by the influence of wind change, tower shadow effect and other factors in the power generation process of the downwind aerogenerator. The invention increases the work efficiency of the aerogenerator, reduces the wear degree of parts, and is more safe and convenient during maintenance.