The basic principle of wind power generation is that the kinetic energy of the wind is converted into mechanical energy through a wind turbine, [1] which then drives the generator to generate electricity and convert it into electrical energy. The leading wind turbine is generally a horizontal axis wind turbine, which consists of blades, hubs, speed-increasing gearboxes, generators, main shafts, yaw devices, control systems, towers and other components. The function of the wind wheel is to convert wind energy into mechanical energy. It is composed of blades with excellent aerodynamic performance mounted on the hub. The low-speed rotating wind wheel is accelerated by the speed-increasing gear box, and then transmits the power to the generator. [2] The above components are arranged in the nacelle, and the whole nacelle is supported by the tower. In order to effectively utilize the wind energy, the yaw device controls the yaw motor according to the wind direction signal measured by the wind direction sensor, and drives the small gear engaged with the large gear on the tower to rotate, so that the nacelle is always facing the wind. Since the gearbox is a component with a high overload and premature failure rate in the MW-class wind turbine, a direct-drive wind turbine (also known as a gearless wind turbine) has been developed abroad. In order to track the optimal blade tip speed ratio and make the wind turbine obtain the best power output in a large wind speed range, the speed or power must be adjusted. There are two commonly used adjustment methods: one is stall adjustment, and the other is pitch adjustment, that is, the blade can rotate around the axis on the blade to change the aerodynamic data of the blade to realize power adjustment.
Post time: Sep-17-2022
