45results about How to "Reduce ultimate load" patented technology

The invention discloses a floating fan base with flare type tension legs, a marine wind-driven generator and a construction method. The floating fan base comprises a top supporting platform, a bottom supporting structure, at least three hollow stand columns and a ballast regulating system, wherein the top supporting platform is used for supporting a pylon, blades and a wind-driven generator set; the bottom supporting structure is connected with multiple tension legs; the top supporting platform is connected with the bottom supporting structure via the hollow stand columns, the hollow stand columns are arranged around the vertical center line of the floating fan base, and each stand column inclines outwards from a lower end to an upper end relative to the vertical center line of the floating fan base; the ballast regulating system is arranged in the stand columns and / or the bottom supporting structure. The marine wind-driven generator of the base with the structure has excellent movement performance, integral wet towing can be performed, and the floating fan base and the marine wind-driven generator are convenient to manufacture, assemble and mount.

Provided are a method, equipment and system for controlling a wind generating set. The method for controlling the wind generating set comprises the steps that engine room relevant position parametersof the wind generating set are acquired through a global positioning system; real-time engine room vibration displacement is determined based on the engine room relevant position parameters; a real-time tower bottom bending moment load is determined according to the real-time engine room vibration displacement; and when the real-time tower bottom bending moment load is larger than a tower bottom bending moment load threshold value, the wind generating set is controlled to operate under a preset control strategy to reduce the load of a tower of the wind generating set. According to the method,equipment and system for controlling the wind generating set, the limit load of the tower of the wind generating set can be effectively reduced, and the survival ability of the tower under the extremecondition can be improved.

The embodiment of the invention provides a method and device for controlling a wind generating set to be shut down. The method comprises the steps of measuring pitch angles of blades of the wind generating set in real time in real time, and monitoring whether the wind generating set generates brake torque or not in real time; when the monitored wind generating set cannot generate the brake torque and the average pitch angle of the currently-measured pitch angles corresponding to the blades is smaller than the preset pitch angle threshold value, controlling the blades to be collected at the first blade collecting speed, and recording fist time of blade collection at the first blade collection speed; and when the first time exceeds the preset time threshold value, controlling the blades to be collected at the second blade collecting speed until the average pitch angle of the blades reaches the shutdown angle, wherein the first blade collection speed is larger than the second blade collection speed. According to the technical scheme, shutdown operation of the operating wind generating set can be achieved, and meanwhile the limit load of a tower of the wind generating set is effectively reduced.

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 invention discloses a yaw ultralimit IPC variable rate stop method for a wind generating set. According to the yaw ultralimit IPC variable rate stop method for the wind generating set, a load shedding control module based on yaw ultralimit IPC variable rate feathering of a wind wheel azimuth angle is added on the basis of a conventional control strategy, specifically, when the wind generatingset enters into a stop logic, whether a fault type triggered by the wind generating set is a yaw ultralimit stop alarm or not is first distinguished, if not, corresponding stop logic action is adopted, and if so, the IPC variable rate stop is adopted; real-time measurement of a fan impeller azimuth angle through sensors is carried out; and variable pitch of blades of the wind generating set is carried out based on an IPC variable rate feathering logic of the azimuth angle, and pitch angles are increased gradually, when the pitch angles of three blades are increased to more than 60 degrees, CPCis adopted to carry out feathering until the pitch angles of the three blades reach the maximum pitch angles, feathering stop action is completed. The yaw ultralimit IPC variable rate stop method forthe wind generating set can reduce the overturning moment introduced by unbalanced thrust and effectively realize load optimization control over the wind generating set under special working conditions.

The invention discloses a wind generating set variable rate feathering halt method based on accelerated velocity of an engine room. On the basis of a conventional control strategy, a variable rate feathering module based on the former accelerated velocity and the current accelerated velocity of the engine room is added. The method comprises the steps that when the set enters the halt logic, firstly, whether the fault type triggered by the set is software hypervelocity halt alarm or not is judged; If no, the corresponding halt logic action is taken, and if yes, the variable rate feathering haltlogic based on the accelerated velocity of the engine room is adopted; the former accelerated velocity and the current accelerated velocity of the engine room are measured in real time through a sensor; after filtering is conducted through a filter, a feathering rate value is output to be superposed with an original feathering rate value output by a controller; and then, amplitude limiting is conducted, and a final feathering rate value is multiplied by the cycling time of the controller, so that a final pitch angle given value is obtained and transmitted to a variable pitch system till all vane pitch angles reach the maximum pitch angle and the feathering halt action is completed. By means of the method, the load optimization control, under the special working condition, over the wind generating set can be achieved.

The invention provides a variable-speed feathering shutdown method and device and a wind turbine generator set, and relates to the technical field of wind turbine generator set feathering shutdown. The wind turbine generator set comprises a generator and a cabin, wherein the generator is installed in the cabin. The method comprises the steps that the shutdown feathering speed of the wind turbine generator set is changed from an initial first shutdown feathering speed to a second shutdown feathering speed according to the rotating speed of the generator and the acceleration of the cabin, wherein the first shutdown feathering speed is determined by the pitch angle at the initial moment of the wind turbine generator set, and the second shutdown feathering speed is determined by the pitch angle at the current moment of the wind turbine generator set; the shutdown feathering speed of the wind turbine generator set is changed from the second shutdown feathering speed to a third shutdown feathering speed according to the rotating speed and power of the generator, and feathering and shutdown are completed at the third shutdown feathering speed. Through the method, the device can enable thewind turbine generator set to have a good load reduction effect in the shutdown process.

The invention provides a floating type draught fan mooring system, an offshore wind generator unit and an assembly method of the offshore wind generator unit. The floating type draught fan mooring system comprises a rigid weight and a floating foundation. Multiple first cable fixing portions are arranged on the floating foundation. The rigid weight is provided with multiple second cable fixing portions and multiple third cable fixing portions. The first cable fixing portions and the second cable fixing portions are correspondingly connected through first cables. The third cable fixing portions are connected with fourth cable fixing portions under the sea through second cables. According to the floating type draught fan mooring system, the offshore wind generator unit and the assembly method of the offshore wind generator unit, the structure that the rigid weight is connected to the position below the floating foundation through the cables is adopted, the rigid weight can evenly bear the stress of the cable fixing portions, and therefore the floating foundation can be kept stable in a storm; the rigid heavy block is arranged below the floating foundation at a certain distance, so that the center of gravity of the whole mooring system is lowered, and the overall anti-storm capacity can be greatly improved.

The invention discloses a limit load identification method for a wind power generator unit. The limit load identification method comprises the following steps: S01, starting, and establishing a limit load database of the wind power generator unit, wherein various limit load characteristics and corresponding trigger logics are preset in the limit load database ; S02, when the wind power generator unit normally runs, collecting running state data of the wind power generator unit and wind resource data of an environment where the wind power generator unit is located in real time; and S03, comparing each piece of data collected in the step S02 with the triggered logic of the corresponding limit load in the limit load database, when the collected data is consistent with the triggered logic of one certain limit load, carrying out load drop control on the wind power generator unit, and otherwise, continuously carrying out running according to a normal running logic. The limit load identification method for the wind power generator unit has the advantages of simpleness and convenience in operation, accuracy in control, active avoidance in limit load and the like.

The invention provides a high-thermal stability PBX explosive and a preparation method thereof. The explosive comprises, by mass, 84-88% of cyclotetramethylenetetranitramine, 8-12% of triaminotrinitrobenzene and 2-6% of a bonding system; and a binder in the bonding system is polyacrylate rubber HyTemp 4454, and a plasticizer in the bonding system is dioctyl sebacate or dioctyl phthalate. The preparation method comprises the following steps: dissolving the bonding system by analytically pure ethyl acetate through adopting a solvent volatilization process, carrying out vibrating dispersion on TATB in analytically pure petroleum ether, and pouring the obtained bonding system solution into an HMX explosive while stirring until the solvent is completely volatilized; and adding the obtained TATBsuspension, performing stirring for 1-2 h until the solvent volatilizes to form a paste, sieving the paste to form 0.5-1.0 mm particles, and drying the particles to obtain the PBX explosive. The PBXexplosive prepared in the invention has the advantages of high energy, low mechanical sensitivity and good thermal stability.

The invention discloses a control method and device capable of restraining overspeed of a wind generating set. The method includes the steps that output parameters generated when the generating set runs are detected in real time, and pitch control over the generating set is carried out according to difference values between real time detection values of the output parameters and target controlling values; and when pitch control is carried out, the running state of the generating set is judged in real time, when it is judged that the generating set is in the overspeed state, an overspeed restraining control part is started, current pitch-control control parameters are adjusted, pitch control is carried out according to the adjusted control parameters, response speed of pitch control is adjusted to rapidly decrease the running speed of the generating set, or current pitch control is carried out. The device comprises a pitch control unit and an overspeed judgment and restraining unit. By means of the control method and device, overspeed of the wind generating set can be restrained, the running reliability of the wind generating set under the working conditions including the extreme gustiness is improved, and the beneficial effects of being easy to control, low in needed control cost, high in control accuracy and flexible in control are achieved.

The invention discloses a limit load control method based on an energy storage wind turbine generator, a medium and equipment. The method comprises the following steps: calculating each wind speed Vi between the limit wind speed of a target wind power plant once encountering one year and the limit wind speed of a target wind power plant once encountering 50 years, and superposing the limit load of the whole unit and a yaw angle theta i of the head of the whole unit under the condition of power failure of a power grid to obtain a yaw angle theta i1 of the machine head corresponding to the minimum limit load under each wind speed Vi of the whole unit; issuing the corresponding relation between Vi and theta i1 to a master control mode or a booster station storm wind fault control mode of each machine position; and when the wind speed of the target wind power plant is predicted to reach Vi and the power grid loses power, adopting each stand-by power supply of the target wind power plant, wherein the included angle between the head direction and the wind direction is theta i1. By means of the control method, larger blades can be selected, the overall generating capacity of the unit is improved, and wind resources are fully utilized.

The invention provides a method and a system for reducing limit load of a wind turbine set. The method includes the steps that when the rapid change of the rotation speed of a wind turbine is detected, the control target rotation speed of variable pitch PI control is reduced to a specified value; the specified time of the control target rotation speed of the variable pitch PI control after reduction is maintained; and the pitch angle is controlled to a value of the minimum pitch angle calculated according to the wind speed. According to the method and the system for reducing the limit load ofthe wind turbine set, the limit load of the wind turbine set can be effectively controlled.

The invention discloses an active load reduction control method of a wind generating set based on an external wind condition. The method comprises the following steps that (1) by processing the wind speed and the real-time wind speed and wind direction collected by a wind indicator, the wind condition severity degree coefficient is output; (2) by processing the real-time tower front-back vibrationand left-right vibration collected by a vibration sensor, the vibration severity degree coefficient is output; (3) the maximum power setting value of the set is output by means of the wind conditionseverity degree coefficient obtained through wind condition evaluation and calculation and by means of the vibration severity degree coefficient obtained through vibration evaluation and calculation;and (4) a maximum power setting value of the set is defined at the setting value output in the step (3), so that the generated power of the set is reduced, and the active load reduction of the set isrealized. By means of the method, the generated power of the set is actively reduced, so that the wind load on an impeller face is reduced, the tower vibration degree is finally reduced, and then thegenerated power amount loss caused by unnecessary shutdown inspection is avoided.

The invention discloses a control method and system for the pitch angle of a wind turbine generator set, equipment and a storage medium, and belongs to the field of wind power generation. Whether extreme wind direction changes occur or not is judged by detecting the wind direction measured by a wind indicator and comparing the wind direction with a preset threshold value, and the minimum pitch angle is dispatched to cope with the limit load caused by rapid wind direction changes. The positive and negative wind directions measured by the wind indicator are judged, and the load borne by a large part of the set is larger than that borne in a positive wind direction when the minimum pitch angle is increased during flow incoming in the negative wind direction, so that the limit load is reduced by only performing control of increasing the minimum pitch angle on the wind direction of the positive incoming flow. Compared with a control mode without distinguishing the wind directions, the limit load caused by the extreme wind direction changes of the set is further reduced. By means of a mode of judging the wind speed threshold value, the condition that the current measured wind speed exceeds the threshold value serves as the primary condition, and the problem of loss of the generating capacity of the set due to increase of the pitch angle under the condition that the wind speed is low but the bending moment of the set is not impacted is solved.

The invention discloses a method for yaw bearing limit load reduction of a wind turbine generator system based on the posture of a cabin. The method is based on the posture of the cabin measured by aninclination angle sensor. When the extreme gust wind condition occurs, through the cabin posture change sensed by the inclination angle sensor in the cabin, load reduction control is applied, the yawbearing limit load of the wind turbine generator system under the extreme working condition is reduced, and therefore the safe operation of the wind turbine generator system is guaranteed. Accordingto the method, the limit load of a yaw bearing can be effectively reduced, the load reduction effect is stable and reliable, the application range is wide, the hardware cost is low, and great advantages are brought to the whole machine design, type selection, manufacture and operation of the wind turbine generator system.

The invention discloses a shallow water seaborne floating type fan mooring system. The system comprises a fan, a floating body foundation arranged below the fan and a plurality of mooring structures arranged on the periphery of the floating body foundation, each mooring structure comprises at least one mooring structure unit, each mooring structure unit comprises an anchor chain, a buoy assembly and a plurality of counterweight assemblies, the upper end of the anchor chain is fixedly connected with the floating body foundation, and the lower end is fixed to the seabed; the buoy assembly is fixedly arranged on the anchor chain close to the floating body foundation and used for providing vertically-upward buoyancy for the anchor chain, and the buoyancy is larger than vertically-downward acting force borne by the anchor chain at the position; and each counterweight assembly is fixedly arranged on the anchor chain between the buoy assembly and the lower end of the anchor chain, and is used for providing vertically downward pulling force for the anchor chain. The shape of the anchor chain is changed through a buoy, and the restoring force of the mooring structure is optimized; and meanwhile, the anchor chain is provided with balancing weight, the unit length density of the anchor chain is increased, the catenary effect is improved, the mooring rigidity is improved, the steel consumption and the length of the anchor chain can be reduced, and the manufacturing and construction cost is saved.

The invention discloses an offshore wind and wave combined power generation device. The offshore wind and wave combined power generation device comprises a large-megawatt horizontal-axis wind-driven generator, a floating damping pool foundation, a support, oscillating float type wave power generating equipment and a flexible mooring system; the floating damping pool foundation is fixed to a sea bed through the flexible mooring system; the large-megawatt horizontal-axis wind-driven generator and the oscillating float type wave power generating equipment are integrated on the floating damping pool foundation; multiple pieces of the oscillating float type wave power generating equipment are fixed to the support to form an array and are located in the hollow area of the floating damping pool foundation; the large-megawatt horizontal-axis wind-driven generator and the oscillating float type wave power generating equipment are electrically connected with a box-type transformer arranged inside the floating damping pool foundation; and an accumulator arranged inside the floating damping pool foundation is connected with the box-type transformer and is used as a back-up power supply for thelarge-megawatt horizontal-axis wind-driven generator. According to the offshore wind and wave combined power generation device, the intensive sea utilization efficiency can be improved, the equipmentequally-sharing cost can be reduced, and the comprehensive energy field incomes can be increased.

The invention provides an operation control method and system for a wind generating set for extreme gust, and the method comprises the steps: carrying out the sliding average calculation of a first time constant and a second time constant on a detected wind speed, and judging whether a first wind speed flag bit is set to be positive or not according to a first wind speed mean value and a second wind speed mean value; moving average calculation of a third time constant is carried out on the detected wind direction, and whether the wind direction flag bit is set to be positive or not is judged according to the wind direction mean value; judging whether a power speed flag bit is set to be positive or not according to the calculated power speed of the generator; moving average calculation of a fourth time constant is carried out on the wind speed, and whether the second wind speed flag bit is set to be positive or not is judged according to the third wind speed mean value; and if each flag bit is set to be positive, wind load unloading control is carried out once within preset time, and a control strategy is maintained. According to the method, whether the unit faces extreme gust or not is comprehensively judged by combining factors such as wind direction deviation, misjudgment is reduced, and the limit load of the unit is timely and efficiently reduced.

The invention discloses a wind power cut-out control method for improving the wind energy utilization rate of a wind generating set. The wind power cut-out control method for improving the wind energy utilization rate of the wind generating set comprises the following steps that an anemograph signal V<t> is acquired, and filtering results of different time lengths through different filters are obtained; whether the filtering results of wind speed signals are greater than two groups of set values or not is judged to obtain two groups of Boolean values; whether to stop or not is judged according to the first group of Boolean values; if not, power reduction operation is executed according to the second group of Boolean values and the corresponding duration; and whether to execute power recovery operation or not is judged according to the relationship between the filtering results and the set values in the preset time. According to the wind power cut-out control method for improving the wind energy utilization rate of the wind generating set, under the condition that the structural design of the wind generating set is not improved, by improving the control algorithm of the wind generating set, the fatigue load is reduced, the situation that the wind generating set stops under strong wind is reduced, and the generating capacity is improved.

The invention discloses a method, system and equipment for controlling the pitch angle of a wind turbine under the power-off condition of the power grid, which belong to the field of wind power generation. By detecting the power-down signal of the power grid, the front and rear acceleration signals of the nacelle are introduced to participate in the variable speed at the time of performing the operation of shutting down the propeller. The propeller control logic avoids the extreme load of the unit to the greatest extent, improves the operation safety of the unit under extreme wind conditions, adopts real-time variable speed propeller retraction to stop, fully considers the dynamic response characteristics of the whole machine, and calculates the corresponding variable speed propeller retraction command in real time . The invention uses the front and rear acceleration of the nacelle as the control input to participate in the pitch control under the condition of power failure of the power grid, overcomes the traditional method that does not consider the vibration of the tower and the whole machine, and innovatively introduces the front and rear of the nacelle on the basis of a constant pitch rate. The acceleration-pitch rate control loop makes full use of the dynamic response information of the whole machine in the detected front and rear acceleration signals of the nacelle, and reduces the ultimate load of the tower during the real-time changing pitch action.

The invention discloses a wind generating set variable rate feathering halt method based on accelerated velocity of an engine room. On the basis of a conventional control strategy, a variable rate feathering module based on the former accelerated velocity and the current accelerated velocity of the engine room is added. The method comprises the steps that when the set enters the halt logic, firstly, whether the fault type triggered by the set is software hypervelocity halt alarm or not is judged; If no, the corresponding halt logic action is taken, and if yes, the variable rate feathering haltlogic based on the accelerated velocity of the engine room is adopted; the former accelerated velocity and the current accelerated velocity of the engine room are measured in real time through a sensor; after filtering is conducted through a filter, a feathering rate value is output to be superposed with an original feathering rate value output by a controller; and then, amplitude limiting is conducted, and a final feathering rate value is multiplied by the cycling time of the controller, so that a final pitch angle given value is obtained and transmitted to a variable pitch system till all vane pitch angles reach the maximum pitch angle and the feathering halt action is completed. By means of the method, the load optimization control, under the special working condition, over the wind generating set can be achieved.

The invention discloses a method for yaw bearing limit load reduction of a wind turbine generator system based on the posture of a cabin. The method is based on the posture of the cabin measured by aninclination angle sensor. When the extreme gust wind condition occurs, through the cabin posture change sensed by the inclination angle sensor in the cabin, load reduction control is applied, the yawbearing limit load of the wind turbine generator system under the extreme working condition is reduced, and therefore the safe operation of the wind turbine generator system is guaranteed. Accordingto the method, the limit load of a yaw bearing can be effectively reduced, the load reduction effect is stable and reliable, the application range is wide, the hardware cost is low, and great advantages are brought to the whole machine design, type selection, manufacture and operation of the wind turbine generator system.

The present application discloses a method for calculating the effective wind speed of a rotor, which includes: obtaining wind measurement data measured at each measuring point, and preprocessing the wind measurement data to obtain line-of-sight wind speed data; establishing a linear shear wind field model; using The linear shear wind field model calculates the wind field characteristic parameters of the measurement plane where each measuring point is located according to the line-of-sight wind speed data; calculates the effective wind speed of the rotor according to the wind field characteristic parameters of each measurement plane. The effective wind speed of the rotor obtained in the present application is more time-sensitive, and there is no problem of measurement time lag; at the same time, the accuracy of the effective wind speed of the rotor is also greatly improved, which is conducive to the maximum wind energy tracking of wind turbine power generation, and can provide a variable pitch for wind turbines. The control provides reliable control parameters, which is of great significance for reducing the fatigue load and ultimate load of the fan. At the same time, the present application also provides a calculation system, equipment and readable storage medium for the effective wind speed of the rotor, which have the above beneficial effects.

The invention provides a method and equipment for ensuring safe clearance of a wind driven generator, which comprises the following steps of: firstly, introducing gust identification into an algorithm for changing the pitch of a unit in advance, adding an additional angle to a theoretical minimum pitch angle of the unit to serve as a minimum set pitch angle of the unit when gust in a certain time period is detected, and keeping for a certain period; therefore, it is ensured that the unit tower clearance keeps a certain safety margin, and the unit operation performance is improved; and secondly, the gust is accurately recognized, the pitch angle of the unit is increased according to a certain control algorithm, and the limit load of the unit under the gust working condition can be reduced. The video monitoring equipment is installed on the tower, the distance between the blade tip of the unit and the tower wall is captured in real time, when it is detected that the distance is smaller than a certain preset threshold value, the pitch can be changed in advance, and the tower clearance is increased by lifting the pitch angle of the unit.

The invention discloses a blade pitch angle compensation control method which comprises the steps of according to a certain time period, monitoring the generator speed of a wind generation set in thecontinuous time period in real time; calculating the generator speed error and the speed error change rate of the n period corresponding to the n-1 period; and comparing the speed error and the speederror change rate of the n period with preset reference values of a main control system of the wind generation set, wherein if the speed error and the speed error change rate of the n period exceed the preset reference values of the main control system of the wind generation set, the main control system of the wind generation set sets a rated pitch-regulated angle for a pitch system of the wind generation set, and the compensation control on a blade pitch angle is realized. The invention further discloses an anti-overspeed control method of the wind generation set comprising the blade pitch angle compensation control method. The aim of controlling the actin of the pitch angle in advance if necessary can be achieved, the wind generation set is ensured to run stably, the shutdown caused by the overspeed of the wind generation set is effectively avoided, the limit load during shutdown caused by the overspeed is effectively reduced, and the damage rate of the wind generation set is reduced.

The invention discloses a control method, system, equipment and storage medium for the pitch angle of a wind turbine, belonging to the field of wind power generation. The wind direction is measured by detecting the wind direction meter and compared with a preset threshold to determine whether an extreme wind direction change has been encountered, and through scheduling Minimum pitch angle to cope with extreme loads caused by rapid changes in wind direction. The positive and negative direction of the wind direction measured by the anemometer is used as a judgment. Since increasing the minimum pitch angle when the negative wind direction is coming, the load experienced by the large components of the unit will be greater than that of the positive wind direction, so only increase the minimum pitch angle for the positive wind direction. Control of the distance from the angle to reduce the ultimate load. Compared with the control method that does not distinguish the wind direction, it further reduces the ultimate load brought by the unit when the extreme wind direction changes. Using the method of judging the wind speed threshold, the current measured wind speed exceeds the threshold as the primary condition, to avoid the problem of generating loss caused by increasing the pitch angle due to the small wind speed but not yet impacting the bending moment of the unit.

The invention discloses a limit load identification method for a wind power generator unit. The limit load identification method comprises the following steps: S01, starting, and establishing a limit load database of the wind power generator unit, wherein various limit load characteristics and corresponding trigger logics are preset in the limit load database ; S02, when the wind power generator unit normally runs, collecting running state data of the wind power generator unit and wind resource data of an environment where the wind power generator unit is located in real time; and S03, comparing each piece of data collected in the step S02 with the triggered logic of the corresponding limit load in the limit load database, when the collected data is consistent with the triggered logic of one certain limit load, carrying out load drop control on the wind power generator unit, and otherwise, continuously carrying out running according to a normal running logic. The limit load identification method for the wind power generator unit has the advantages of simpleness and convenience in operation, accuracy in control, active avoidance in limit load and the like.

The invention discloses a control system and method for assisting gust crossing through fan yaw, and the system comprises a controller, a fan, a yaw motor, a wind speed detection sensor, a wind direction detector, a fan generator rotating speed sensor and a fan blade angle detector. The controller enables the fan blades to act in the feathering direction, when gust aggravates and exceeds a gust preset threshold value, the action speed of the fan blades is increased, and when the speed of the fan blades reaches the preset maximum blade speed threshold value, the rotating speed of a fan generator is increased to the set parameter threshold value of the generator, and then the fan blades are driven to act in the feathering direction. The yaw motor is started immediately, meanwhile, the yaw motor is controlled to move in the wind facing angle increasing direction till the rotating speed of the generator is reduced to the rated rotating speed lower than the rotating speed of the generator, the gust yaw motor is shut down immediately, and a normal wind facing program is recovered; according to the invention, the limit load and fatigue load of the fan are reduced.

The invention relates to a novel wind turbine segmented blade. A blade tip segment and a blade root segment are connected through a local variable pitch device, a flange and a connection piece of a connection transition segment; the blade root segment is a cylindrical rotating body structure or a rotating body structure in a similar cylinder shape, and the outer surface of the blade root segment is wrapped by a lightweight rectifying shell; and the position between the rectifying shell and the blade root segment is filled with a lightweight sandwiched material. The rectifying shell comprises afront edge extending shell structure and a rear edge extending shell structure which correspondingly wrap the front edge and the rear edge of the blade root segment, and wing shapes correspondingly lengthening the front edge and the rear edge are formed. The novel wind turbine segmented blade facilitates manufacturing, transporting and installing of blades, the production efficiency can be effectively improved, and cost is lowered.