82 results about "Tip-speed ratio" patented technology

The invention relates to the technical field of power grid power dispatching. The new energy power cooperative scheduling method and system based on the smart power grid are provided, and the method comprises the steps: generating an original data set; based on the original data set, constructing a digital twinborn model of the wind turbine generator, and generating a real-time fatigue damage distribution prediction result of the gearbox and the bearing; the blade tip speed ratio and the variable pitch angle are dynamically optimized, and dynamic control parameters are generated; the dynamic control parameters are issued to a wind turbine generator controller for execution, the power grid dispatchable capacity is calculated based on a real-time fatigue damage distribution prediction result, an adjustable capacity upper limit is generated, a cross-energy compensation strategy is triggered, closed-loop optimization is achieved, the problem that accumulated damage of high-frequency power adjustment to equipment cannot be accurately quantified is solved, and the power grid dispatching capacity is optimized. The efficiency of a multi-objective optimization algorithm is improved, and the phenomena of frequent shutdown, wind curtailment rate rise and peak regulation resource waste are reduced, so that the new energy consumption capability and the power grid economy are improved.

An on-line wind alignment angle calibration system of a wind direction instrument, comprising a wind direction instrument on-line calibration system, a cabin, a tower base, a monitoring room, and a server; the wind direction instrument on-line calibration system comprises: a wind direction instrument (1), a housing upper cover (2), a transmission gear (3), a transmission shaft (4), an integrated control module (5), a housing (6), a base (7), a speed reducer (8), a drive motor (9), and an angle encoder (10). Further provided is a calibration method based on the calibration system. The calibration method comprises: preprocessing wind power data; performing data processing by means of a DBSCAN clustering analysis method; performing data processing by means of a quartile algorithm, and determining a data interval; calculating a blade tip speed ratio interval; extracting wind direction interval power; and calculating a wind alignment angle. The wind alignment angle deviation of a wind turbine is obtained by means of calculation using an intelligent algorithm, then a reference zero position of the wind direction instrument is adjusted by means of an intelligent precise hollow drive module, thus on-line adjustment and calibration of the reference zero position of the wind direction instrument can be achieved, and safety hazards due to manual operation, frequent adjustment and calibration, high-altitude operation, and the like are reduced. Also provided are a computer-readable storage medium and a computer device for implementing the calibration method.

The invention discloses a large and ultra-large wind turbine generator design method based on a compressible flow principle, which comprises the following steps: constructing a high tip speed ratio CP-lambda curve, greatly increasing the optimal tip speed ratio lambda opt corresponding to the maximum wind energy capture efficiency CPmax, and integrally widening the CP-lambda curve; blade parameter optimization is designed; a high-modulus and low-density carbon fiber material is adopted, a structural characteristic optimization design method developed based on a bionic structure is adopted, and blade structural design optimization is executed; by adopting an owl-like sawtooth trailing edge noise reduction technology and a design method, the main aerodynamic sound source-blade tip trailing edge noise of the blade is inhibited; a whole machine pneumatic-servo-elastic coupling model is constructed, and multidisciplinary optimization design, a system engineering method based on the model and subsystems are adopted for joint modeling and systematic collaborative optimization design. According to the invention, the design of large and ultra-large wind turbine generators with the advantages of high efficiency, high reliability and low cost is realized.

The invention discloses a direct-driven fan system impedance modeling method considering frequency coupling, and the method comprises the steps: S1, obtaining a mathematical expression of a blade tip speed ratio and output power according to a wind turbine airflow model of a direct-driven fan; s2, according to equivalent circuit topology modeling under a dq coordinate system of the permanent magnet synchronous motor, obtaining an expression of electromagnetic torque and electromagnetic power; s3, according to the control structures of the machine-side converter and the grid-side converter of the direct-drive fan, modeling is carried out respectively, and an equivalent admittance mathematical expression of the machine-side converter and six disturbance admittance expressions in the direct-drive fan are obtained; and S4, based on the mathematical expressions of the output power, the electromagnetic power, the equivalent admittance and the disturbance admittance obtained in S1, S2 and S3, establishing the equivalent admittance / impedance of the direct-drive fan system. According to the method, multi-time-scale control and full-working-condition frequency domain port characteristics of the direct-driven fan system can be effectively represented, and the equivalent impedance model can accurately analyze the stability of the system.

The invention discloses an operation control method and device for a vertical axis wind turbine generator, and belongs to the technical field of wind power generation. The method comprises the steps that a pitch angle of a lower blade is driven to be gradually increased to a preset angle at a preset angular speed through a variable pitch controller; when the rotating speed of the wind wheel reaches the cut-in rotating speed, the optimal tip speed ratio is tracked until the rotating speed of the wind wheel rises to the rated rotating speed; when the rotating speed of the wind wheel reaches the rated rotating speed, the rotating speed of the wind wheel is stabilized at the rated rotating speed; when the driving torque under the action of the aerodynamic load continuously exceeds the rated torque of the generator and the rotating speed of the generator reaches an early-warning rotating speed threshold value, a shutdown control strategy is triggered; and under the shutdown control strategy, the connection between the generator and the power grid is cut off, and mechanical braking is applied, so that the wind wheel stops rotating. According to the technical scheme, smooth starting of the wind wheel, stable operation at the rated rotating speed and safe shutdown in the fault state are achieved, the starting and stopping capacity and power stability of the unit are effectively improved, the wind speed application range is expanded, and it is guaranteed that the whole-process operation of the unit is safe and reliable.

The invention discloses multistage duct turbofan power generation equipment, and relates to the technical field of power generation equipment. The ducted shell comprises a first ducted shell body and a second ducted shell body which are coaxially arranged in a communicating mode. The flow guide assembly is arranged in the first duct shell and used for guiding external airflow into the second duct shell; the positioning assembly is arranged in the duct assembly; and the middle shaft is arranged in the duct assembly through a positioning assembly. Aiming at the pain points of structural fatigue, shaking and space waste caused by one-way torque conduction when a conventional wind driven generator is mounted on a mobile platform, a conformal integrated duct design is adopted, and a two-stage turbofan, a planetary reverse rotation mechanism and a permanent magnet generator are coaxially integrated, so that air flow shrinks in a trumpet-shaped duct to accelerate pre-swirl flow guide, and the flow guide efficiency is improved. The contra-rotating turbofan is further driven to do work synchronously, the torque is completely self-counteracted, high tip speed ratio operation can be achieved at the low wind speed, and efficient and zero-reaction-torque power generation in the narrow space of the mobile platform is achieved.

The invention provides a fan blade extension optimization method and system based on finite element analysis, and relates to the technical field of wind power design, and the method comprises the steps: obtaining the overall structure and blade appearance of a wind wheel, and obtaining the parameters of the wind wheel; the blade tip speed ratio is calculated by analyzing the influence of wind wheel parameters on the blade appearance, and blade chord length and airfoil parameters are obtained to construct a three-dimensional model of the blade; according to the three-dimensional model of the blade, blade aerodynamic shape design and aerodynamic load analysis are carried out to obtain a blade shape and load analysis result; and according to the blade appearance and the load analysis result, constructing a blade finite element model. According to the method, the extension optimization design of the fan blade is realized by means of collecting wind regime data, accurately calculating blade parameters, constructing a three-dimensional model, carrying out pneumatic analysis and finite element analysis and the like.

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 invention discloses a vertical axis wind turbine blade structure, which relates to the field of wind power generation, and comprises a basic platform, a rotating rack, two blade bodies and two linear telescopic components, the rotating rack is rotatably mounted on the upper part of the basic platform, the bottom end of each blade body is hinged to the upper part of the rotating rack, and the two blade bodies are symmetrically arranged; the lower end of each linear telescopic component is hinged to the lower portion of the rotating rack, and the upper end of each linear telescopic component is hinged to the outer side of one blade body. According to the blade structure of the vertical-axis wind driven generator, the blade tip speed ratio and the sweeping area can be changed, the utilization hours of the wind driven generator are increased, and the survival wind speed of the wind driven generator is increased.

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.

The invention discloses a primary frequency modulation cooperative control method and device for a wind generating set under variable wind speed. The method comprises the steps that a wind speed predicted value is predicted according to the running state of the wind generating set; a first interval critical value is calculated according to the reserved overspeed load shedding level, and a second interval critical value is calculated according to the rotating speed maximum value and the tip speed ratio; judging whether the wind speed is in a low wind speed range, a middle wind speed range or a high wind speed range based on the wind speed predicted value, the first interval critical value and the second interval critical value, and selecting a corresponding load shedding frequency modulation strategy; within the low-wind-speed range and the medium-wind-speed range, reference rotating speed is calculated according to the reserved overspeed load shedding level and transmitted to the rotating speed control process of the wind turbine generator; in a middle wind speed range and a high wind speed range, a pitch angle is adjusted and transmitted to a pitch angle control process, and meanwhile, maximum rotating speed control and primary frequency modulation response are considered; and coefficients in cooperative control are set according to different wind speed stages.

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 provides a novel vertical shaft annular wind wheel fan and a control method.The fan comprises a wind wheel assembly and a guide rail support, the wind wheel assembly comprises a wind wheel frame, a plurality of inclined supports and blades, the inclined supports are arranged on the wind wheel frame, the blades are arranged on the wind wheel frame, and an annular beam assembly is rotationally connected with the wind wheel frame assembly; the wind wheel frame is separated from the tower column, so that the wind wheel assembly is light in weight, the starting inertia of the wind wheel frame is reduced, the blades are installed on the wind wheel frame, the number of the blades can be increased at will, but the weight is not increased too much, the whole fan adopts modular design, cost is minimized, and installation is convenient. The control method comprises the steps that the converter collects the rotating speed of the motor and converts the rotating speed into the linear speed of the blades, the anemometer collects wind speed data and transmits the wind speed data to the main control system, the wind speed and the critical wind speed are judged, the rotating speed of the blades is controlled through optimal tip speed ratio control or motor torque control measures, and therefore the fan can generate power normally and efficiently, and the rotating speed of the wind wheel frame is controlled. And galloping accidents are avoided.

The present invention discloses a design method for large and super-large wind turbines based on the compressible flow principle, comprising: constructing a high tip speed ratio C P ‑λ curve, which converts the maximum wind energy capture efficiency C Pmax The corresponding optimal tip speed ratio λ opt Substantially increased, overall widening of C P The proposed method employs a novel λ-λ curve; optimizes blade parameters; utilizes high-modulus, low-density carbon fiber materials and employs a structural property optimization design method based on biomimetic structure development to optimize blade structural design; employs owl-like serrated trailing edge noise reduction technology and design methods to suppress blade tip trailing edge noise, the primary aerodynamic noise source; constructs an aerodynamic-servo-elastic coupling model for the entire turbine, employing multidisciplinary optimization design and model-based systems engineering methods to jointly model and systematically optimize the subsystems. This invention achieves the design of large and ultra-large wind turbines with high efficiency, high reliability, and low cost.

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 power frequency modulation control method for reducing the fatigue load of a wind driven generator, and belongs to the technical field of wind power generation. Wind energy is captured by blades of the wind driven generator and converted into mechanical power, and corresponding tower thrust and blade tip speed ratio are obtained; in consideration of a connection relation in a transmission chain structure of a wind turbine generator, the whole transmission system is simplified into a dual-mass-block model; establishing a simplified generator first-order inertia model, a simplified pitch angle adjusting system first-order inertia model and a simplified tower model; establishing a linear state space model of the wind turbine generator by using a small signal analysis method according to the model; and solving a target function and designing a constraint equation according to the model. A power regulation control strategy is provided for the whole operation area (namely partial and full-load states) of the wind driven generator, so that the problem of the service life of the wind driven generator is solved.

The present invention discloses a power optimization method for a wind turbine generator set, which relates to the technical field of wind turbine generator sets. The dynamic adjustment and optimization of the tip speed ratio further improves the conversion efficiency of wind energy. By calculating the tip speed ratio under different wind speed conditions and combining the variation range of the rotor angular velocity, the relatively optimal interval of the tip speed ratio is accurately obtained, and the mechanical energy conversion efficiency of the wind wheel is monitored and evaluated, and the wind wheel power coefficient under different wind speed conditions is calculated to ensure that better power output can be achieved under various wind speed conditions. Finally, the feedback adjustment of the rotor angular velocity further smoothes the output power. After obtaining the standard conversion conditions, the system can trace and adjust the angular velocity of the rotor, so that the wind turbine generator set can adapt to different wind speed changes and achieve smooth power output.

The invention relates to controlling a wind turbine. A predefined power coefficient data structure and a predefined thrust coefficient data structure respectively comprise values of a power coefficient and a thrust coefficient as functions of blade pitch angle and tip speed ratio. The invention includes using an iterative search algorithm to determine values of pitch angle and tip speed ratio that maximise the power coefficient value in the predefined power coefficient data structure subject to a constraint that the thrust coefficient value in the predefined thrust coefficient data structure is no greater than a maximum threshold thrust coefficient value. A rotor speed reference is determined based on the determined tip speed ratio value and on a received wind speed. The determined pitch angle value is set as a pitch angle reference. The wind turbine is controlled in accordance with the pitch angle and tip speed ration references.

A rotor blade for a wind turbine includes a blade root, a blade tip, and a longitudinal length extending from the blade root to the blade tip. The rotor blade includes an inner portion having an inner portion length extending from a first inner portion end at the blade root to a second inner portion end, and an inner angle of attack decreasing along the inner portion length from the first inner portion end to the second inner portion end. The rotor blade includes an outer portion having an outer portion length extending from a first outer portion end proximate the second inner portion end to a second outer portion end at the blade tip, and an outer angle of attack constant along the outer portion length for a maximum lift-to- drag ratio of the outer portion at a design tip-speed-ratio and at a design wind velocity.

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 utility model relates to the technical field of wind driven generators, in particular to a horizontal shaft type breeze wind turbine which comprises a support, a rotating shaft, rose-shaped fan blades and lifting force type blades, the rotating shaft is horizontally arranged on the support, the two ends of the rotating shaft are rotationally connected with the support, and each rose-shaped fan blade comprises a shaft sleeve and an arc-shaped fan blade. The arc-shaped fan blades are wound on the shaft sleeve according to the Archimedes spiral line, the lift force type blades are fixed to the rose-shaped fan blades, the downwind rotation directions of the rose-shaped fan blades and the lift force type blades are the same, and the rose-shaped fan blades are resistance type blades, are not high in rotation speed but large in output torque and can be rapidly started under the condition of low wind speed. And a higher blade tip rate ratio can be obtained by being matched with a lift type blade for use. The rose-shaped fan blade is provided with three arc-shaped fan blades, the lift-type fan blade is provided with three sets of supporting rods and wing-shaped fan blades, the supporting rods play a role in supporting and fixing the arc-shaped fan blades, and the wing-shaped fan blades can obtain a higher blade tip rate ratio.

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.

The invention discloses an inflow angle determination method and device, a storage medium and an electronic device.The method comprises the steps that the local tip speed ratio of a blade is determined according to the incoming flow wind speed and the running rotating speed of the blade; determining a magnitude relationship between the local tip speed ratio and a preset tip speed ratio; under the condition that the size relation indicates that the local tip speed ratio is larger than or equal to the preset tip speed ratio, the inflow angle of the blade element of the blade is determined according to the local tip speed ratio; and under the condition that the size relation indicates that the local tip speed ratio is smaller than the preset tip speed ratio, the inflow angle of the blade element of the blade is determined according to the lift line slope of the blade and the local tip speed ratio. The problem that the calculation time for determining the inflow angle of the leaf element is long or the calculation result is inaccurate in the related technology is solved.