38results about "Wind motor control" patented technology

A wind power plant and a method of start up at least a part of a wind power plant connected to an external grid substantially without any energy delivered from the external grid for the start up is provided. The wind power plant having a plurality of wind turbines and at least one power source connected to at least one of the wind turbines in order to start the wind turbine while isolated from the remaining wind turbines. The started wind turbine may then supply power in order to start further wind turbines. Power may be delivered to the grid from the started wind turbines.

Several embodiments that enhance and improve the efficiencies of vertical axis wind turbine generators by expanding their normal range of useful operations. Stationary vanes provided external to the rotor blades provide directional control of wind/air flow into the blades for decreased drag and increased differential wind pressure. Control scenarios for adjusting stationary wind vanes and additional ducting of air to increase efficiencies.

The invention relates to a fan direct-driven variable pitch system based on a digital twin and an optimum design method, and belongs to an optimum design method of a wind driven generator system. An SCADA (supervisory control and data acquisition) system and a sensor are installed in a physical solid model of the fan direct-driven variable pitch system, so that data of the generator speed, the wind speed, the power, a pitch angle, the variable pitch moment, the blade vibration, the environmental temperature and the like are collected; the data are transferred to the virtual space of the digital twin of the fan direct-driven variable pitch system by virtue of a digital twin mapping model, and the virtual space of the digital twin of the fan direct-driven variable pitch system is integratedwith multi-disciplinary, multi-physical quantity, multiscale and multi-probability simulation by updating a sensor and analyzing history data, so that the life cycle process of physical solid equipment of the corresponding fan direct-driven variable pitch system is reflected, the optimum design, production and reliable operation and maintenance of the system are completed, the problem of evaluation of the quality and manufacturability of the scheme after a traditional variable pitch system is manufactured can be solved, and the production cost is effectively reduced.

The invention discloses a control method for a yaw lubrication system of a wind turbine generator set. The control method comprises the following steps: initializing the lubrication time and the lubrication interval; setting a fixed lubrication time and a lubrication period; correcting the lubrication time and the lubrication interval according to temperature feedback from the wind turbine generator set; when detecting that a yaw system of the wind turbine generator set starts to act, accumulating the lubrication time but not the lubrication interval; when the yaw system does not act, accumulating the lubrication interval but not the lubrication time; every period of time, detecting whether the lubrication time accumulated during the time reaches the fixed lubrication time set above or not; when detecting that the lubrication time during the time does not reach the fixed lubrication time, forcibly performing lubrication for the lubrication period till the lubrication time during the time reaches the fixed lubrication time; and when detecting that the lubrication time during the time reaches the fixed lubrication time, continuing the cyclic detection till the wind turbine generator set stops working.

The invention discloses a variable-pitch hydraulic transmission wind turbine. The wind turbine comprises a wind energy acquirer and a variable pump coaxially connected; the variable pump is provided with a variable pump control unit; the variable pump communicates with a hydraulic energy storer, an oil supply system, a high-pressure pressure gauge, a high-pressure pressure sensor and a pilot electric-hydraulic proportional control valve through a one-way valve at the same time; the pilot electric-hydraulic proportional control valve is connected with a permanent magnet synchronous generator through a variable motor; the variable motor is provided with a variable motor control unit; the variable pump communicates with an inlet oil filter; the variable motor communicates with an outlet oil filter; the inlet oil filter communicates with a low-pressure pressure gauge, a low-pressure pressure sensor, an overflow valve and the outlet oil filter at the same time; the overflow valve also communicates with a hydraulic oil tank; and a one-way valve communicates between an outlet end of the one-way valve and an inlet end of the inlet oil filter. The invention further discloses a control method of the variable-pitch hydraulic transmission wind turbine. The device and the method are reliable in work.

The invention discloses a tower-top-load-based independent variable-pitch control method for a wind generating set. The method comprises steps as follows: firstly, sensors are attached to the top endof a tower, the tower top bending moment Mx, the tower top bending moment My and the tower top bending moment Mz are directly collected through the sensors, and then the D-axis load and the Q-axis load are calculated according to the collected tower top loads, that is, the D-Q axis load is calculated; secondarily, the D-axis load and the Q-axis load are output to be D-Q axis variable-pitch instructions through filters, PI controllers and amplitude limitation; finally, the D-Q axis variable-pitch instructions are subjected to D-Q axis reverse transformation, the variable-pitch instruction of each paddle is obtained, and the variable-pitch instructions are stacked on a unified variable-pitch instruction. According to the method, the tower top loads are used as feedback quantities for independent variable-pitch control, and three groups of load sensors are reduced into one group, so that the reliability is improved while the cost is remarkably reduced.

The invention discloses a wind turbine blade with an embedded diversion pipe capable of controlling tip vortex. The wind turbine blade comprises a blade tip device, an air inlet, an air outlet and a diversion pipe, wherein a plurality of air inlets are arranged at the leading edge nearby the blade tip of the blade tip device; a plurality of air outlets are arranged at the blade tip of the blade tip device; the air inlets are communicated with the air outlets by diversion pipes; and the diversion pipes are internally provided with throttling devices for controlling the air flow. The wind turbine blade provided by the invention has simple structure, is used as a blade extension segment connected to the wind turbine blade without changing the main body of the wind turbine blade, and is separately designed according to the actual situation of providing the blade wind turbine, or integrally designed by considering the device and the pneumatic structure portion of the wind turbine blade as a whole, thus maximally controlling the generation of the tip vortex, improving the pneumatic efficiency of the wind turbine and reducing the noise level.

The present invention can be included in the technical field of power control systems of electrical generation units comprising a supervisory regulation link applicable to a generation unit which calculates operating parameters or orders based on temporary averages of the power measurement.

The invention relates to windshield speed-reducing device and method of a wind power generator. When a wind power generator encounters wind power which is larger than safe wind speed, a fan and a cabin are steered by the start of a windshield device so that the rotating plane of the fan is parallel to the direction of wind. The wind power generator comprises a pylon; a cabinet is assembled on the top end of the pylon; and the front end of the cabinet (11) is provided with a fan. The windshield device comprises an aerovane, a processor and a steering controller, wherein the aerovane is installed on the wind power generator and generates a wind direction and wind speed signal; the processor is installed on the wind power generator and coupled with the aerovane, receives the wind direction and wind speed signal, calculates a deflecting angle of the cabinet of the wind power generator according to the wind direction and wind speed signal and converts the deflecting angle into a deflecting angle signal; and the steering controller is installed on the wind power generator, used for controlling the deflection of the cabinet and coupled with the processor, receives the deflecting angle signal and controls the cabinet to deflect in a preset angle.

A system and method are provided for effectively removing ice that may have formed on gas turbine engine compressor inlet guide vanes and/or preventing, or at least inhibiting, reformation of ice on gas turbine engine compressor inlet guide vanes after the ice has been removed. A determination is made as to whether actual inlet guide vane position differs from the commanded inlet guide vane position by a predetermined amount. If so, then the inlet guide vanes are repeatedly commanded to move in at least two predetermined directions to remove ice that may have formed on the inlet guide vanes.

The invention discloses a variable pressure yaw brake hydraulic system for a wind generating set and a control method thereof. The variable pressure yaw brake hydraulic system for the wind generatingset comprises a system oil source, a two-position three-way electromagnetic directional valve, a first energy accumulator, a variable pressure oil source loop and a yaw brake. An oil cylinder of the yaw brake communicates with a second oil port of the two-position three-way electromagnetic directional valve through two check valves with the opening directions being opposite. A first oil port of the two-position three-way electromagnetic directional valve is connected with the system oil source and the first energy accumulator. A third oil port of the two-position three-way electromagnetic directional valve is connected with the variable pressure oil source loop. The variable pressure oil source loop comprises two two-position two-way electromagnetic switching valves which are in parallel connection and a second energy accumulator which is connected with the two two-position two-way electromagnetic switching valves. According to the variable pressure yaw brake hydraulic system for the wind generating set and the control method thereof, the proper yaw brake pressure can be automatically and optimally selected according to external loads, the stability in the course of yawing is guaranteed without lowering drive capability, and the probability that yawing drive is subjected to impact loading due to external load magnitude variation and direction switching in the course of yawing is eliminated.

The invention discloses a maximum power output control method suitable for controlling a variable speed wind turbine group through concentrated variable flow. According to n wind turbines which are controlled by the same converter in a concentrated mode and are constant in rotating speed and different in input air speeds, the concentrated converter and overall wind turbine propeller pitch variation mechanisms are controlled in a coordinated mode, and therefore maximum power output of the wind turbine group is achieved. A control objective of the concentrated converter is that the speed of the wind turbine with the higher wind speed approaches to the optimal rotating speed as much as possible and a control objective of the propeller pitch variation mechanisms is that the highest wind energy utilization rate of the wind turbine with the lower wind speed is obtained at the unified rotating speed of the wind turbine group. The optimal calculation method is adopted and the frequency conversion alternating current bus frequency and the overall wind turbine propeller pitch angle which correspond to the maximized output power of the wind turbine group are worked out. The maximum power output control method is suitable for the variable speed wind turbine group controlled by an AC-DC converter in a high-voltage direct current power transmission system and an AC-AC frequency converter in a frequency division power transmission system.

The invention provides a hydraulically controlled frequency stabilization power generating method, which comprises the following steps that: a. an impeller collects flow field energy and the flow field energy is converted into mechanical energy; b. the mechanical energy is transmitted to a parallel-connection pump unit with variable initial phase angles by a power distribution box to be converted into hydraulic energy, and the hydraulic energy is transmitted to a variable hydraulic motor through a current collector; c. a constant speed controller cooperates with a control valve group in a control loop and an electric control variable mechanism in the hydraulic motor to obtain flow entering the hydraulic motor and the optimal matching of displacement of the hydraulic motor, so that the hydraulic motor rotates at constant speed and outputs the mechanical energy, and the mechanical energy is transferred to a generator; and d. the constant-speed stable mechanical energy is converted into constant frequency electrical energy to be output by the generator. The invention adopts a closed hydraulic loop to realize the conversion and long distance transfer of flow field energy, solves the problems that the existing wind power generating device has high cost, difficult constant frequency and voltage regulation, difficult installation and maintenance and the like, and can effectively reduce the construction and operation and maintenance costs of wind power generating equipment.

A variable-vane assembly for a turbocharger includes an annular nozzle ring supporting an array of rotatable vanes, an insert having a tubular portion sealingly received into the bore of the turbine housing and having a nozzle portion extending radially out from one end of the tubular portion and being axially spaced from the nozzle ring with the vanes therebetween, and an annular retainer ring disposed radially outward of the nozzle ring and extending generally radially inwardly. The nozzle ring's face is stepped, and a radially inner edge of the retainer ring engages the face of the nozzle ring radially outward of the step, the radially inner edge of the retainer ring having an axial thickness that is less than the step height such that a remaining portion of the step is presented to the exhaust gas flowing through the nozzle.

The invention discloses a wind driven generator capable of being started immediately and relates to wind driven generators. The wind driven generator is provided with a motor, a motor control module, a generator body, a load output control module, a wind turbine and a sensor module. The motor control module is connected with the motor, the generator body is connected with the motor through a transmission mechanism, the input end of the load output control module is connected with the generator body, and the output end of the load output control module is connected with a load. The wind turbine is connected with the generator body through a transmission mechanism, the sensor module is connected with the motor control module and the load output control module through a CAN bus, and the sensor module is connected with the generator body. The wind driven generator has the features of rapidly-started wind driven generators, the starting time is shortened, soft starting is conducted on the motor, and the service life of the motor is prolonged; power monitoring is conducted on the generator body, the maximum power point can be effectively and automatically tracked, and the service life of the generator body can be prolonged; the CAN bus is used for communication, the communication distances between all the modules are effectively enlarged, and the application field is effectively widened.

The invention relates to a dynamic torque control method capable of tracking optimal modal gain based on air density. The method specifically comprises the following steps that S1, a main control system obtains a real-time wind speed, whether the real-time wind speed is greater than a preset rated wind speed or not is judged, the step S4 is executed if the real-time wind speed is greater than thepreset rated wind speed, and otherwise, the step S2 is executed; S2, a torque control module obtains an air density value and an angular speed of blade rotation, calculates to obtain an optimal torquecontrol coefficient, and sends the optimal torque control coefficient to the main control system; S3, the main control system adjusts the blade tip speed ratio of a wind wheel according to the optimal blade tip speed ratio corresponding to the optimal torque control coefficient, and maximum capture of wind energy is achieved; and S4, a pitch angle control module constructs a pitch angle algorithmmodel according to simulation software, adjusts corresponding parameters to calculate to obtain an optimal pitch angle parameter and sends the optimal pitch angle parameter to a variable pitch system, the variable pitch system adjusts a pitch angle, and a constant rotating speed is maintained to realize maximum capture of wind energy. Compared with the prior art, the method has the advantages ofachieving maximum capture of wind energy, effectively improving the wind energy utilization efficiency of a wind turbine generator and the like.

A system and method for mitigating overvoltage on a DC link of a power converter of an electrical power system connected to a power grid includes receiving a voltage feedback signal from the DC link for a predetermined time period. The method also includes determining a rate of change of the voltage feedback signal during the predetermined time period. Further, the method includes predicting a future voltage value on the DC link as a function of the voltage feedback signal and the rate of change of the voltage feedback signal. Moreover, the method includes controlling the electrical power system based on the future voltage value.

The invention relates to a numerical control speed-regulating mini-type wind driven generator. The generator comprises a generator, a tail vane, a fan blade, a lamp post and a flange disc, wherein the fan blade is arranged at one end of the tail vane and a square hole is arranged at the other end of the tail vane. The generator further comprises a speed-regulating gear box and a collecting ring rotary could deck, wherein the speed-regulating gear box is arranged on the collecting ring rotary could deck; an output shaft of the speed-regulating gear box is a squared head which is adapted to the square hole on the tail vane; a shaft of the collecting ring rotary could deck is rigidly connected with the lamp post through the flange disc; the collecting ring rotary could deck is provided with a wind driven generator fixing shaft; and a dust-proof cover covers the collecting ring rotary could deck. The numerical control speed-regulating mini-type wind driven generator disclosed by the invention is scientific and simple in structure design, is reliable to work and low in cost. In the mini-type wind driven generator, the direction of a rotary plane of the fan blade can be adjusted according to the size of an air speed, so that the wind energy utilization rate is high, the power generation is stable and the protection against strong wind is easy to realize; and therefore, the service life of the wind driven generator is prolonged and the safety performance of a finished product is better.

The invention discloses a method and system for controlling power of a wind turbine generator under the strong wind condition, and belongs to the field of wind power generation. Whether the rotating speed set value and the torque set value of a generator need to be adjusted or not is judged by detecting an anemograph, the newest rotating speed reducing and torque increasing set values of the generator are calculated, the requirement for reducing the unit limit load under the strong wind condition is considered to the maximum degree, and meanwhile it is guaranteed that the output power of the unit is kept unchanged, and no generating capacity loss exists. The torque set point increasing value is obtained through calculation. The rotating speed reducing and torque increasing mode of the generator is adopted as a power control mode under the strong wind condition, and therefore the limit load of large components under the strong wind condition is reduced, meanwhile, the output power of the generator is kept unchanged, and the problems that in a traditional mode, only the rotating speed of the generator is reduced, the torque of the generator is unchanged, consequently, the output power of the unit is reduced, and the generating capacity loss is caused under the condition of frequent strong wind are solved.

The invention discloses a free angle change wing vertical axis wind turbine, and belongs to wind power generation equipment. The free angle change wing vertical axis wind turbine comprises a tower 1,a vertical axis 2, a wind wheel connecting disc 3, wing frames 4, movable connecting shafts 5 and angle change wings 6. The free angle change wing vertical axis wind turbine is characterized in that the vertical axis 2 is vertically arranged at the middle part of the tower 1; the wind wheel connecting disc 3 is horizontally arranged at the top of the vertical axis 2; three wing frames 4 are horizontally and asymmetrically arranged on the wind wheel connecting disc 3, and respectively form included angles of 120 degrees; two movable connecting shafts 5 are vertically arranged on each wing frame4; the angle change wings 6 are vertically and movably arranged between every two movable connecting shafts 5; and in the operation of three angle change wings 6, windward surfaces 7 are always towards wind, and leeside surfaces 8 are always opposite to the wind. The free angle change wing vertical axis wind turbine has the following beneficial effects: (1) the manufacturing difficulty of wind turbine wings can be reduced; and meanwhile, the production cost can be reduced; (2) a wind aligning system has no need to be provided; and (3) a generator and a control system can be mounted on the ground to achieve great convenience to the maintenance work.