Automatic yaw control method, controller and control system for wind power generator

Abstract

The invention discloses an automatic yaw control method, controller and control system for a wind power generator. The automatic yaw control method for the wind power generator comprises the steps that the minimum wind speed of the yaw controller in working is preset to be the starting wind speed, and whether the yaw controller is started or not is judged by comparing the current wind speed with the starting wind speed; after the yaw controller is started, whether the current wind speed is smaller than the preset maximum wind speed or not is detected in real time, if yes, a generator head of the wind power generator is controlled to rotate and then drives blades to rotate so as to track the wind direction, otherwise, the generator head of the wind power generator is adjusted to enable thewindward side of each blade and the wind direction to form the included angle of 90 degrees, and the blades stop rotating; and in the wind direction tracking process, the voltage of the power generator is obtained in real time, if the current voltage of the power generator is higher than a preset voltage threshold value, the generator head of the wind power generator is adjusted in real time to enable the windward side of each blade and the wind direction to form a certain included angle, and the effective force bearing area of the blades is decreased so as to stabilize the voltage of the power generator.

Description

technical field [0001] The invention belongs to the field of wind power generation, and in particular relates to a wind power generator automatic yaw control method, controller and system. 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 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 the wind turbine and the automatic yaw control system of the wind turbine: [0004] (1) The traditional wind turbine with tail rudder 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 gen...

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Problems solved by technology

However, due to the fact that it takes time for the wind turbine to yaw, it will take tens of seconds or even a few minutes to yaw after receiving a signal of excessive voltage.

During this period of time, the excessive voltage is enough to cause the load of the system (battery in the off-grid system, inverter in the grid-connected system) to be damaged due to excessive voltage.

[0007] (2) The existing wind turbine yaw system, when encountering 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) It will be damaged; 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

[0008] (3) The existing wind turbine yaw system has 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 brakes Signal lines, etc., there are many cables, which 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

[0009] (4) The existing wind turbine yaw 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, which consumes too much electrical energy

[0010] (5) 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

[0011] (6) The existing wind turbine controller does not have the function of remote data transmission, and the Internet of Things storage of historical data and query functions, 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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