In case the turbine is out of the wind, then the yaw drive rotates the turbine in the wind direction. Yaw motor Powers the yaw drive. G, enerators, a generator is an electrical machine which helps in generating electricity by using the mechanical energy of a prime mover. Wind or Aero-generators are basically wind turbine-generator sets,. A propeller or rotor attached to a turbine which in turn is coupled with an electric generator. The generator is further connected to appropriate electronic devices that help in its connection and synchronization to the electrical grid. Basically there are two types of generators Synchronous generators and Asynchronous generators. Synchronous Generators, synchronous generators are doubly fed machines which generate electricity by the principle of electromagnetic induction.
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Nacelle The nacelle is the housing structure for high speed shaft, low speed shaft, gear box, generator, converter equipment write etc. It is located atop the tower structure mostly in the shadow of the blades. Pitch This is basically the angle the blades make with the wind. Changing the pitch angle changes weather the blades turn in or turn out of the wind stream. Rotor: The hub and the blades together compose the rotor. Tower: Towers are basically made up of tubular steel or steel lattice. Taller upon the towers greater is the amount of power generated as the wind speed generally goes on increasing with height. Wind direction Generally erratic in nature, hence the rotor is made to face into the wind by means of control systems. Wind vane basically the job of a wind sensor, measuring the wind speed and communicating the same to the yaw drive, so as to turn the turbine into the wind flow direction. Yaw drive this drive controls the orientation of the blades towards the wind.
The controller senses wind hotel speed, wind direction, shaft speed and torque at one or more points. Also the temp of generator and power output produced is sensed. Gear box This steps-up or steps down the speed of turbine and with suitable coupling transmits rotating mechanical energy at a suitable speed to the generator. Typically a gear box system steps up rotation speed from 50 to to 1500 rpm. Generator: This can be a synchronous or asynchronous Ac machine producing power at 50Hz. High-speed shaft Its function is to drive the generator. Low-speed shaft The rotor turns the low-speed shaft at about 30 to 60 rotations per minute.
Internal Structure of Wind Turbine, figure. Internal Structure of Wind Turbine. Anemometer This device is used for measurement of speed. The wind speed is also fed to the controller as it is one of the variables for controlling pitch angle and yaw. Blades These are aerodynamically designed structures such that when wind flows over them they are lifted as in airplane wings. The blades are also slightly turned for greater aerodynamic efficiency. Brake this is either a mechanical, electrical or hydraulic brake used for stopping the turbine in high wind conditions. Controller This is the most important part of the turbine as it controls everything from power output to pitch angle.
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