A downwind wind turbine blade system with adjustable blade angular displacement

Abstract

A downwind wind turbine blade system with angular displacement adjustable blades comprises a wind speed sensor, a controller, a hub, blade main bodies and executing mechanisms, wherein the wind speed sensor is arranged outside an engine room close to a wind side, the controller is installed in the engine room and is electrically connected with the wind speed sensor. The hub is installed outside the engine room far from the wind side. The blade main bodies are connected with the hub through a rotating shaft. The executing mechanisms are arranged on two sides of the rotating shaft and connected with the rotating shaft. The executing mechanisms are electrically connected with the controller. The wind speed sensor is used for transmitting speed signals to the controller. The controller gives instruction to command the executing mechanisms to unlock the rotating shaft and then drives the rotating shaft to rotate. The blade main bodies connected with the rotating shaft rotate synchronously along with the rotating shaft at the same angle to achieve the purposes of closing up following the wind or stretching against the wind. Along with changes of wind speed, several angles can be set so as to avoid instability of the blades caused by continuous rotation. The downwind wind turbine blade system with the angular displacement adjustable blades is capable of reducing energy capture of a wind driven generator when the wind speed is high, ensures that the wind driven generator works close to a nominal parameter, thereby enlarging the application range of the wind speed of the wind driven generator.

Description

technical field [0001] The invention belongs to the technical field of wind power generation equipment, and in particular relates to a downwind wind turbine blade system with adjustable blade angular displacement. Background technique [0002] With the depletion of fossil energy, the search for alternative energy has become the top priority of the work related to the energy field in all countries in the world. Wind energy is a clean and renewable energy. It has developed rapidly in my country in the past ten years, and its proportion in the energy structure is also getting higher and higher. However, a big limitation of using wind energy is the narrow economic wind speed range. Generally speaking, the wind speed of 3~20m / s is the economic wind speed that the current wind turbine can adapt to. The start-up wind speed of the wind turbine is 3~4m / s, and the cut-out wind speed (shutdown wind speed) is about 25m / s. When the wind speed is lower than the starting wind speed, the...

AI Technical Summary

Problems solved by technology

Moreover, at extremely high wind speeds, there is a risk of blades colliding with the nacelle for wind turbines in the upwind direction, while there is no such danger for wind turbines in the downwind direction.

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