Control method, controller and system of automatic yaw and pitch-varying of wind driven generator

Abstract

The invention discloses a control method, controller and system of automatic yaw and pitch-varying of a wind driven generator. The control method includes the steps that the minimum wind speed which makes the yaw and pitch-varying controller work is preset as a start-up wind speed, and whether the yaw and paddle exchanging controller is actuated or not is judged by comparing a present wind speed with the start-up wind speed; after the yaw and paddle exchanging controller is actuated, whether the present wind speed is less than a preset maximum wind speed or not is detected in real time, and ifso, the head and blades of the wind driven generator can be simultaneously controlled to rotate to track the direction of wind; if not, the head and the blades of the wind driven generator can be adjusted, thus an included angle of 90 degrees is formed between the windward sides of the blades and the direction of the wind, and the blades stop rotating; in the process of wind direction tracking, the voltage of the generator is acquired in real time, if a present voltage of the generator is higher than a preset voltage threshold, the head and the blades of the wind driven generator can be adjusted simultaneously, thus a certain included angle is formed between the windward sides of the blades and the direction of the wind, and the effective stressed areas of the blades are reduced, so thatthe voltage of the generator is stabilized.

Description

technical field [0001] The invention belongs to the field of wind power generation, and in particular relates to a control method, controller and system for automatic yaw and pitch change of a wind power generator. Background technique [0002] A wind turbine is a power device that converts wind energy into mechanical work, which drives the rotor to rotate, and finally outputs alternating current. The function of the wind turbine yaw and pitch system is to quickly and smoothly align the wind direction when the direction of the wind speed vector changes, so that the wind rotor can obtain the maximum wind energy. [0003] At present, there are the following problems in wind power generators and wind power generator control systems: [0004] (1) The existing small and medium-sized wind power generation systems belong to fixed-pitch blades and do not have an automatic pitch change system. Therefore, the yaw and pitch of the wind turbine cannot be controlled at the same time, an...

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Problems solved by technology

[0004] (1) The existing small and medium-sized wind power generation systems belong to fixed-pitch blades and do not have an automatic pitch change system. Therefore, the yaw and pitch of the wind turbine cannot be controlled at the same time, and the nose steering is only controlled by yaw, and then Adjust the windward side of the blades to reduce the utilization rate of wind energy

[0005] (2) Traditional wind turbines with tail rudders cannot adjust the wind angle when the wind speed exceeds the rated range. When encountering strong winds, it is easy to cause over-speed, over-voltage, and over-current of the wind turbine, which will cause the generator to burn out

At present, when the wind turbine blades rotate too fast and the voltage is too high, there is no corresponding control

[0006] (3) When the existing wind turbine control system encounters strong winds, due to the slow yaw speed, during the yaw process, the load (battery in the off-grid system, inverter in the grid-connected system) will Damage; the existing wind turbine yaw system does not set the minimum start-up wind speed, resulting in when the breeze is not enough to generate electricity, the wind turbine frequently finds the wind direction and consumes too much power

[0007] (4) In the existing wind turbine control system, there are many cables from the ground to the nose, anemometer signal lines, wind direction instrument signal lines, yaw motor control lines, proximity switch control lines, wind turbine lines, control brake signals Wires, etc. There are many cables and they are easy to get entangled

On the one hand, traditional wind turbines do not have the function of automatic untwisting, which may easily cause the cable to break or malfunction

On the other hand, the existing wind turbine yaw control system loses the orientation position of the wind turbine and the entanglement of the cables after power failure, resulting in accidents where the cables are twisted

[0008] (5) The existing wind turbine control system does not set a stable angle. When the wind vane is working, there will be a small angle of swing. When the wind vane swings, the wind turbine yaw system will rotate accordingly, consuming too much power

[0009] (6) Existing wind turbines use worm gears for yaw action. When subjected to a large wind blade torque, the teeth are easily broken or stuck, resulting in yaw failure. When it is stable, it is easy to cause blade vibration, which will cause fatigue of fasteners and affect its life

[0010] (7) The existing wind turbine controller does not have the function of remote data remote transmission, and the function of storing historical data and querying the Internet of Things, and does not have the function of remotely modifying the technical parameters of the controller and the braking function of the wind turbine

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