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 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 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 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 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 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.