26 results about "Tip-speed ratio" patented technology

The disclosure provides a pitch angle control method and device of a variable pitch wind turbine, and relates to the technical field of pitch control, which comprises the following steps: in response to detecting that the wind speed reaches a first wind speed, the pitch angle is controlled to keep the rotating speed of the wind turbine within a preset range; in response to determining that the wind turbine has been connected to the grid and detecting that the wind turbine is running at a first rotating speed, based on a preset first control strategy, the wind turbine is controlled to run at variable speed according to the current wind speed, so that the wind turbine reaches an optimal tip speed ratio; in response to determining that the output power of the wind turbine does not reach a rated output power, the pitch angle is controlled to control the wind turbine to run at the first rotating speed; and in response to determining that the wind turbine reaches the rated output power and the wind speed increases, the pitch angle is increased. Thus, the wind energy captured by the wind turbine can be controlled by adjusting the pitch angle, so as to improve the efficiency of the wind turbine and protect the wind turbine.

The utility model discloses a novel vertical axis wind turbine based on a 3D printing technology. Comprising two sets of resistance type blades, a set of lift type blades and the like, the contact area between the resistance type blades and wind is enlarged through a spiral structure, the starting torque and the wind energy capturing efficiency are improved, and the lift type blades can maintain efficient conversion at medium and high wind speeds and can provide balance for the whole fan; the rotating speed of the blades is regulated and controlled through inner and outer shafts and a gear speed change device, light-weight and modular manufacturing is achieved in combination with a 3D printing high-performance composite material, and a wind speed sensor is integrated. PID (Proportion Integration Differentiation) control parameters are dynamically optimized by adopting a BP (Back Propagation) neural network, the optimal tip speed ratio of a resistance type fan blade and a lift type fan blade is matched according to real-time wind speed, and when the resistance type fan blade reaches the optimal tip speed ratio, an operation mode is switched through a separation device, so that the lift type fan blade and the resistance type fan blade independently operate to ensure that the lift type fan blade reaches the optimal tip speed ratio; the utility model aims to give consideration to high starting performance and stable and efficient power generation.

The application relates to a wind turbine tip speed ratio control and simulation method with reference rotating speed correction, which comprises the following steps: obtaining a generator theoretical optimal rotating speed reference value based on real-time wind speed of a wind turbine and optimal tip speed ratio; inputting the generator theoretical optimal rotating speed reference value into a low-pass filter, obtaining a generator actual rotating speed reference value after filtering and limiting, constructing a rotating speed closed-loop control based on the generator actual rotating speed reference value and an actual rotating speed of the generator, calculating a generator torque reference value, and applying generator torque control based on the generator torque reference value. Compared with the prior art, the application can find a good balance among the three control targets of wind energy capture efficiency, active power fluctuation of a grid-connected unit and shaft torsional vibration load of the unit, and can adapt to performance degradation of the unit and changes of environmental air density without losing power generation when the conditions occur.

The present application belongs to the field of wind power generation technology, and particularly relates to a wind power generator optimal torque coefficient correction method and device. First, when the wind power generator exits the maximum power tracking state, a plurality of data pairs of the wind power generator in the maximum power tracking state are obtained, one data pair including a wind energy utilization rate and a tip speed ratio corresponding to the wind energy utilization rate; then, the data pairs with the wind energy utilization rate greater than that in the balance state are selected from the obtained data pairs, and a standard tip speed ratio is calculated according to all the tip speed ratios in the selected data pairs; finally, the optimal torque coefficient is corrected by using the difference between the standard tip speed ratio and the tip speed ratio in the balance state, so that the error gradually decreases, and the optimal torque coefficient can be corrected slowly with the changes of the environment and the wind power generator parameters, and the optimal torque coefficient can be kept optimal for a long time by self-correction adjustment, and the power generation performance of the wind power generator is improved.

Embodiments of the present application provide a rotating speed control method and device, a vertical axis wind turbine and a storage medium, and relate to the technical field of wind turbine control. The method adjusts the motor side load voltage which is inversely related to the rotating speed of the vertical axis wind turbine, according to the operating stage of the vertical axis wind turbine, the real-time tip speed ratio, the real-time rotating speed, and the preset parameters obtained from the corresponding tip speed ratio-power coefficient curve of the vertical axis wind turbine, to control the rotating speed of the vertical axis wind turbine in each operating stage, so as to take the tip speed ratio and the real-time rotating speed as the control variables, integrate all operating stages such as real-time calibration, dead zone identification, resonance avoidance, power tracking and safe shutdown into the same control framework, and enable the vertical axis wind turbine to have the intelligent operating ability of "acting according to the wind and adjusting the rotating speed according to the demand" like a wind turbine with variable pitch.

The invention discloses a maximum wind energy tracking method based on a CAOA-Elman model and related equipment. The method comprises the following steps: acquiring operation data of a to-be-tested wind turbine generator; the operation data comprises a wind wheel rotating speed, a pitch angle and generator output power; inputting the operation data into a CAOA-Elman model for wind speed prediction to obtain a wind speed prediction value of the to-be-tested wind turbine generator; calculating a reference rotating speed corresponding to the maximum power point of the to-be-measured wind turbine generator according to the wind speed predicted value of the to-be-measured wind turbine generator and a preset tip speed ratio; and transmitting the reference rotating speed to a rotating speed control system of the wind turbine generator to be tested so as to realize maximum wind energy tracking. According to the invention, efficient operation control under the condition of randomly changing wind speed can be realized.

The invention discloses a wind turbine generator group wake flow optimization method and system suitable for generating power synergy. The method comprises the following steps: establishing an engineering wake flow model considering wake flow delay; in the wake flow area, the equivalent wind speed of the downstream wind turbine generator is calculated; acquiring a sensitivity coefficient of the wind speed with respect to the thrust coefficient based on an engineering wake flow model; acquiring a wind speed sensitivity coefficient according to the fact that the equivalent wind speed is a polynomial about an upstream unit thrust coefficient, namely a multivariate nonlinear function about a tip speed ratio and a pitch angle; establishing a wind turbine generator group increment state-space equation based on the wind speed sensitivity coefficient; establishing an optimization target for improving the generated power; and based on the wind turbine generator group increment state equation of the wind speed sensitivity coefficient, an optimization value is solved, and an optimization instruction of the optimized active power and the pitch angle is sent to a wind turbine generator controller.

A horizontal axis wind turbine, HAT wind turbine (151), for a bulk production of electricity from wind, comprising a tower (5), a nacelle (6), a generator, a rotor (152), and a blade (154), the rotor being rotatable about a rotor axis by the wind and having at least two blades, the rotor having a rotor solidity SOLrotor of maximally 0.05, the rotor configured to have a design tip speed ratio λdesign of at least 4, and an electric power coefficient CPE of at least 0.30, the rotor having a radius R and a diameter D which is at least 50m, the rotor further having an average radial solidity avgsol.25R in the radial range from 0.2R to 0.3R, and an average radial solidity avgsol.75R in the radial range from 0.7R to 0.8R, wherein the ratio between the average radial solidities avgsol.25R / avgsol.75R is one of: less than 2.00; less than 1.75; less than 1.50; less than 1.25; less than 1.00; less than 0.90; less than 0.75; less than 0.50; and less than 0.25.

A horizontal axis wind turbine, HAT wind turbine (151), for a bulk production of electricity from wind, comprising a tower (5), a nacelle (6), a generator, a rotor (152), and a blade (154), the rotor being rotatable about a rotor axis by the wind and having at least two blades, the rotor having a rotor solidity SOLrotor of maximally 0.05, the rotor configured to have a design tip speed ratio λdesign of at least 4, and an electric power coefficient CPE of at least 0.30, the rotor having a radius R and a diameter D which is at least 50m, the rotor further having an average radial solidity avgsol.25R in the radial range from 0.2R to 0.3R, and an average radial solidity avgsol.75R in the radial range from 0.7R to 0.8R, wherein the ratio between the average radial solidities avgsol.25R / avgsol.75R is one of: less than 2.00; less than 1.75; less than 1.50; less than 1.25; less than 1.00; less than 0.90; less than 0.75; less than 0.50; and less than 0.25.

The present application provides a kind of marine wind power generation system, including stacked wind power generation device and hydrogen production and storage device, stacked wind power generation device is by rotating platform and is equipped with stacked fan frame of power generation fan, and can rotate around the rotation axis connected with superstructure, to adjust the state of rotating platform under different wind speed conditions.Flexible, simultaneously, the four corner points of stacked fan frame are jacked to different heights by hydraulic jacking device, so that the appropriate angle between stacked fan frame and incoming wind is formed, so that the appropriate attack angle of blade is obtained to achieve the best tip speed ratio, to ensure the maximum wind energy capture rate.The wind power generation system can also convert redundant electric energy into hydrogen energy with lower storage cost and transportation cost through hydrogen production equipment and high-pressure gaseous hydrogen storage equipment, solving the cost problem.Overall, the system can effectively promote the low-carbon green operation of ship.

The invention discloses a wind turbine generator frequency modulation standby power evaluation method based on effective wind speed calculation. The method comprises the steps that the maximum wind energy utilization coefficient of a wind turbine generator and the wind speed-pitch angle relation of the wind turbine generator under the optimal power are obtained; based on the impeller rotating speed, the impeller radius and the blade tip speed ratio, the effective wind speed of the wind turbine generator is calculated; the current maximum available power of the wind turbine generator is obtained based on the maximum wind energy utilization coefficient of the wind turbine generator, the wind speed-pitch angle relation of the wind turbine generator under the optimal power and the effective wind speed of the wind turbine generator, and the up-regulation standby power available for frequency modulation is obtained by subtracting the real-time measured electromagnetic power of the generator from the current maximum available power of the wind turbine generator. The wind speed is obtained without depending on an anemorumbometer, the maximum available power of the corresponding wind turbine generator is evaluated based on calculation of the effective wind speed, and the target of effectively evaluating the frequency modulation standby power is achieved.

The invention provides a wind turbine generator control method and system based on instability risk analysis and electronic equipment, and relates to the technical field of wind power generation control, and the method comprises the steps: calculating the tip speed ratio and the variation thereof by obtaining the wind speed and the wind wheel rotating speed at the current moment and the previous moment in real time; determining the pneumatic torque variation by combining the pneumatic torque at the current moment and the pneumatic torque at the previous moment; and generating a curve change slope reflecting the operation state, and judging whether the curve change slope is greater than zero or not. If the slope is larger than zero, it is judged that the unit has the instability risk, and control parameters are adjusted immediately to maintain stable operation. According to the method, the instability risk can be recognized in advance, the control response speed is increased, the problems of instability recognition lagging and untimely regulation in the prior art are solved, and the operation stability and safety of the wind turbine generator are improved.

The invention discloses an icing monitoring method for a fan blade and a related device, and the method comprises the steps: obtaining the real-time operation data of a target fan and the real-time monitoring image data of the blade, and inputting the real-time operation data and the real-time monitoring image data of the blade into a dynamic performance monitoring model, the real-time output power of the target fan is obtained; calculating an error value between the real-time output power and the actual power of the target fan, and when the error value exceeds a preset threshold value, triggering a performance degradation alarm; after the performance degradation alarm is triggered, the operation data of the corresponding time period of the target fan are input into a pre-trained isolated forest model, anomaly detection of the tip speed ratio and the pitch angle of the target fan is carried out, and the method and the related device can accurately detect whether the fan blades are frozen or not.

This invention provides a method, apparatus, wind turbine inclinometer, and control system for measuring pitch angle based on a wind turbine inclinometer, relating to the field of inertial sensor technology. The wind turbine is equipped with an absolute encoder for measuring the real-time angle of a target blade, and also with a wind turbine inclinometer for measuring the real-time angle of the target blade. The method includes: acquiring a first angle value and a second angle value; wherein the first angle value is the real-time angle value output by the wind turbine inclinometer, and the second angle value is the real-time angle value output by the absolute encoder; performing weighted fusion processing on the first and second angle values ​​to obtain the real-time pitch angle of the target blade; acquiring the real-time tip speed ratio, and determining the optimal pitch angle of the target blade based on the relationship curve between the real-time tip speed ratio and the wind energy utilization coefficient; and sending the real-time pitch angle and the optimal pitch angle to a pitch controller. The method provided by this invention can provide an accurate pitch angle.

A three-stream gas turbine engine with an embedded electric machine and methods of operating the same are disclosed. In one aspect, a three-stream engine includes an electric machine operatively coupled with a shaft of the engine. The three-stream engine also includes a core engine and a primary fan and a mid-fan positioned upstream of the core engine. The primary fan and the mid-fan are operatively coupled with the shaft. During operation, the three-stream engine defines a tip speed ratio being defined by a tip speed of a rotor of the electric machine to a tip speed of a mid-fan blade of the mid-fan. The tip speed ratio is defined as being equal to or greater than 0.2 and less than or equal to 1.0.

The invention relates to controlling a wind turbine that is operating in a noise control mode. A baseline minimum pitch curve is retrieved, that describes collective pitch angle of rotor blades of the wind turbine as a function of tip-speed ratio, TSR, of the wind turbine, to maximise power output. A defined stall angle is retrieved that is an angle of attack of the wind turbine for stalling the wind turbine. A maximum angle of attack that is a defined margin less than the defined stall angle is set. The invention includes determining a modified minimum pitch curve that modifies the baseline minimum pitch (20) curve to maximise power output of the wind turbine against a constraint that the defined maximum angle of attack is not exceeded. The invention includes controlling the wind turbine to operate in the noise control mode according to the modified minimum pitch curve.

The horizontal shaft lift force type wind turbine blade with the blade tip front edge slotted comprises a wind turbine blade body, the wind turbine blade body is provided with a high-pressure face and a low-pressure face, the wind turbine blade body is provided with a front edge and a rear edge, any end of the wind turbine blade body is provided with a drainage seam, and the drainage seam is provided with a starting end and a stopping end. Part of airflow flows from the high-pressure surface to the low-pressure surface through the drainage seams, a stable airflow layer is formed on the low-pressure surface, the airflow redistribution can reduce the pressure difference of the wingtip area and weaken the spanwise flowing of the airflow, and therefore generation of wingtip vortexes is restrained, induced resistance is reduced, and compared with a traditional blade, the blade has the advantages that the blade is simple in structure and convenient to use. The power of the wind turbine and the wind energy utilization coefficient under the same tip speed ratio are obviously improved.

The application discloses a kind of time course optimization methods of wind energy tracking control of large wind turbine considering aging effect, comprising: S100. Quantitative evaluation of unit performance degradation, SCADA parameter selection and its data preprocessing are carried out, unit performance degradation quantitative evaluation model is constructed, and unit aging state is evaluated by field SCADA data;S300. Optimize unit control time course, judge unit degradation state by SCADA data;S200. Maximum wind energy tracking control, according to the evaluated unit aging state, draw the tip speed ratio-wind energy utilization coefficient curve under the unit aging state, approximately describe the basic performance of wind turbine, and obtain the maximum value of wind energy utilization coefficient. This optimization method is proposed for the problem that the decrease of wind energy utilization coefficient caused by natural aging of wind turbine will directly affect the power output of wind turbine, and the best operating condition parameters of wind turbine under aging state can be more accurately obtained, the operating condition is optimized, and the operation power generation efficiency is improved.

The invention discloses a method and system for calculating the effective wind speed of a wind turbine generator. The method comprises the steps that the relation between the pneumatic torque of the wind turbine generator and the wind speed, the pitch angle and the impeller rotating speed and the relation between the torque coefficient of the wind turbine generator and the wind energy utilization coefficient and the tip speed ratio are defined; the pitch angle, the impeller rotating speed and the generator electromagnetic torque of the wind turbine generator are collected, and based on the gear box transmission ratio, the hub rotating inertia, the blade rotating inertia and the generator rotating inertia, the corresponding pneumatic torque is obtained through calculation; calculating a value of a corresponding torque coefficient based on the calculated pneumatic torque, further obtaining a value of the tip speed ratio through function solution or table look-up, and if the value of the tip speed ratio obtained through table look-up is not unique, carrying out condition screening to obtain a unique value of the tip speed ratio; based on the impeller rotating speed, the impeller radius and the unique blade tip speed ratio value, the effective wind speed of the wind turbine generator is calculated. Accurate calculation of the effective wind speed of the wind turbine generator can be achieved, and the method does not depend on an anemorumbometer.

The application relates to the technical field of fan MPPT control, in particular to a fan MPPT control method based on wind speed prediction and PID-DHDP, and discloses a fan MPPT control method based on wind speed prediction and PID-DHDP, which comprises the following steps: acquiring wind speed, temperature, humidity and other data in real time and performing normalization processing on the data; and adopting a wolf swarm algorithm to optimize GRU (Gated Recurrent Unit) hyperparameters. The fan MPPT control method based on wind speed prediction and PID-DHDP predicts the wind speed through a GRU network, obtains a wind speed prediction sequence value, can conveniently calculate a fan rotating speed reference value through the wind speed prediction value and an optimal tip speed ratio, takes a deviation signal between the fan rotating speed reference value and an actual fan rotating speed value as a PID-DHDP controller input signal, constitutes a closed-loop rotating speed control system, realizes that the fan rotating speed is stably at an optimal rotating speed, the fan outputs maximum power, and thus the fan MPPT control is realized.

The invention provides a pitch angle testing method and device based on a fan inclinometer, the fan inclinometer and a control system, and relates to the technical field of inertial sensors. An absolute value encoder used for measuring the real-time angle of a target blade is arranged on the fan, a fan inclinometer used for measuring the real-time angle of the target blade is further arranged on the fan, and the method comprises the steps that a first angle value and a second angle value are obtained; wherein the first angle value is a real-time angle value output by the fan inclinometer, and the second angle value is a real-time angle value output by the absolute value encoder; performing weighted fusion processing on the first angle value and the second angle value to obtain a real-time pitch angle of the target blade; a real-time blade tip speed ratio is obtained, and the optimal pitch angle of the target blade is determined based on the real-time blade tip speed ratio and the wind energy utilization coefficient relation curve; and sending the real-time pitch angle and the optimal pitch angle to a variable pitch controller. The method provided by the invention can provide an accurate pitch angle.

The application discloses a vertical axis wind turbine J type straight blade with Gurney flap, which comprises a J type blade body and a Gurney flap and belongs to the technical field of vertical axis wind turbine blade structure optimization. The application is characterized in that, on the basis of the research on NACA0021 airfoil, the upper surface of the airfoil is cut from the position of the maximum thickness (21% of the chord length) to the trailing edge of the blade, so that the airfoil becomes a J type blade containing a concave part, and a Gurney flap is installed in the inboard of the trailing edge tail, the height of the Gurney flap is 0.75% of the chord length of the airfoil, the width of the Gurney flap is 0.6% of the chord length of the airfoil, and the included angle between the Gurney flap and the trailing edge of the blade is 100°. The Gurney flap combined with the J type blade of the NACA0021 airfoil has good self-starting performance at a low tip speed ratio and good output power at a high tip speed ratio, greatly improves the self-starting performance of a traditional vertical axis wind turbine and alleviates the disadvantage of dynamic stall.

A computer-implemented method, system, and computer program product for minimizing wake loss in wind farms. The optimal values for the power coefficient and the thrust coefficient for each of the wind turbines (e.g., 4D printed wind turbines) in the wind farm that minimize the aggregated wake loss for the wind farm are determined. The wind turbine controllers for each of the wind turbines are then instructed to change the pitch angle and the tip speed ratio for the wind turbines in the wind farm using external stimuli to dynamically adjust the power coefficient and the thrust coefficient for each of the wind turbines to correspond to the optimal values that results in minimizing the aggregated wake loss for the wind farm. In this manner, the overall wake loss in the wind farm is effectively minimized thereby maximizing the collective wind power generation in the wind farm.

The invention relates to a permanent magnet synchronous wind turbine generator efficiency optimal control method and system based on data driving, and belongs to the technical field of wind power generation. The existing permanent magnet synchronous wind turbine generator control strategy focuses on maximum power tracking and neglects the loss change of a converter, so that the overall loss of the system is relatively high and the power generation efficiency improvement is limited. According to the method, a high-precision neural network fitting model is constructed through a data driving mode, and the relation between the converter loss and the torque current d-axis component is accurately correlated; on the basis of realizing the optimal tip speed ratio maximum power tracking, optimizing a torque current d-axis component by adopting a traversal search algorithm, and realizing the loss minimization of the converter; a driving signal is generated by combining proportional integral current control and space vector pulse width modulation, and a complete efficiency optimal control link is formed. Converter loss and calorific value are significantly reduced, the overall power generation efficiency of the system is improved, adaptability is enhanced, the service life of equipment is prolonged, and wind power economic benefits are improved.

The invention provides a full-wind-condition blade wind speed real-time soft measurement method and system based on a wind power model, and belongs to the technical field of wind power generation, and the method comprises the steps: obtaining the rotating speed of a rotor of a wind turbine generator, the electromagnetic power outputted by the wind turbine generator, and the pitch angle of a blade; based on the wind turbine generator rotor speed and the electromagnetic power output by the wind turbine generator, the wind power captured by the wind turbine generator is obtained in real time through an equivalent rotor motion differential equation of the wind turbine generator; obtaining a function value of the intermediate function expression by using a wind power expression captured by a second wind turbine generator based on the wind power captured by the wind turbine generator which is obtained in real time; based on the function value of the obtained intermediate function expression and the pitch angle of the blade, searching the intermediate function table to obtain a blade tip speed ratio; and on the basis of the obtained tip speed ratio and the rotor rotating speed of the wind turbine generator, an average wind speed measurement value is calculated by using a tip speed ratio expression.

The invention discloses a method for determining a wind energy utilization coefficient of a semi-submersible fan, which relates to the technical field of marine sciences, and is characterized by comprising the following steps of: (1) determining an actual wind speed at an infinitesimal point of a fan impeller according to a blade element plane and a flow velocity triangle of the infinitesimal point; (2) determining an inflow angle; (3) correcting an axial induction factor a and a radial induction factor b; (4) according to the six-degree-of-freedom motion relation of the floating platform, the factors of the wave load of the irregular waves for generating the substantial influence on the wind speed are surging, heaving and pitching, and then the wind speed is determined; (5) determining an effective tip speed ratio under the wind wave load coupling influence; and (6) the influence factors of the wind energy utilization coefficient (Cp) are decomposed into the tip speed ratio and the pitch angle, and therefore a correction formula of the Cp is obtained.