Variable-pitch vertical-shaft wind turbine

Abstract

The invention aims to provide a variable-pitch vertical-shaft wind turbine which comprises a power generator, a tower frame, wind wheels, a main shaft, blades, servo motors, main shaft encoders, an anemoscope, an anemometer and a variable-pitch control system, wherein the main shaft and the power generator are respectively mounted on the tower frame; the wind wheels are mounted on the main shaft and rotate round the main shaft; rotary motion of the wind wheels is transferred to the power generator via chain transmission; the blades are mounted on the wind wheels to autorotate and can rotate round the main shaft along with the wind wheels; the servo motors are connected with the blades; the main shaft encoders are respectively connected with the main shaft and the wind wheels and rotate along with the wind wheel to collect instantaneous positions of the wind wheels; the anemoscope and the anemometer are mounted above the main shaft encoder; the power generator supplies power to the variable-pitch control system; and pitch angles of the blades are controlled by the variable-pitch control system. The variable-pitch vertical-shaft wind turbine has the advantages that the startup wind speed of the wind turbine is reduced, the startup performance and the wind energy utilization rate are improved, the working range of the wind turbine is extended, the system flexibility is high, the application range is wide, and the economic benefits and the social benefits are remarkable.

Description

technical field [0001] The invention relates to a power generating device, specifically a wind turbine. Background technique [0002] As a clean and renewable energy, wind energy is an effective alternative energy to solve the energy crisis. The development and development of wind turbines have become the focus of research in various countries. Due to the advantages of convenient installation and maintenance, easy blade processing, and low noise, vertical axis wind turbines have the potential to be comparable to commercial horizontal axis wind turbines. However, the poor start-up performance of vertical axis wind turbines and the disadvantages of lower wind energy utilization compared with horizontal axis wind turbines limit the development of vertical axis wind turbines. However, studies have shown that variable pitch technology can solve the problem of starting wind turbines, reduce blade vibration and The occurrence of dynamic stall is an effective method to improve the ...

AI Technical Summary

Problems solved by technology

However, the poor start-up performance of vertical axis wind turbines and the disadvantages of lower wind energy utilization compared with horizontal axis wind turbines limit the development of vertical axis wind turbines. However, studies have shown that variable pitch technology can solve the problem of starting wind turbines, reduce blade vibration and Occurrence of dynamic stall, an effective method to improve the comprehensive performance of vertical axis wind turbines

[0003] Aiming at the variable pitch technology, people have proposed a variety of schemes, among which the following schemes are the most representative: In 1981, the American scholar L.Kenyon Liljegren proposed the idea of ​​using springs to adjust the pitch of the blades in the patent US4430044, but this scheme is undoubtedly It increases the processing difficulty of the blade, and appears to be "powerless" when controlling the pitch angle of the blade with a large inertia; in 2002, the University of New South Wales adopted a pitch change scheme with a counterweight on the blade, and realized the self-adaptation of the blade by using the centrifugal force Pitch control; Massachusetts Energy Company has successfully developed a cycloidal pitch variable pitch vertical axis wind turbine with a guide rod and cam mechanism. The wind turbine has high efficiency and good start-up performance, but the pitch structure is relatively Complex, and the pitch range of wind turbines is limited by structural parameters

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