Components of a wind turbine
- Blade. A blade is a unit that absorbs wind energy and is used to convert the kinetic energy of the air into mechanical energy for the rotation of the impeller.
- Pitching system. The pitching system changes the pitch angle of the blade, so that the blade is in the best state of absorbing wind energy at different wind speeds, and when the wind speed exceeds the cut-out wind speed, the blade is feathered and braked.
- Gearbox. Gearbox transmits the power generated by the wind rotor under the action of wind to the generator, and makes it get the corresponding speed.
- Generator. A generator is a component that converts the mechanical kinetic energy of the impeller rotation into electrical energy. The rotor is connected to the frequency converter, which can provide voltage with adjustable frequency to the rotor circuit, and the output speed can be adjusted within the range of ±30% of the synchronous speed.
- Yaw system. The yaw system adopts the form of active gear drive to the wind, and cooperates with the control system, so that the impeller is always in the windward state, making full use of wind energy and improving the power generation efficiency. At the same time, the necessary locking torque is provided to ensure the safe operation of the unit.
- Hub system. The function of the hub is to hold the blades together and to take the various loads transmitted on the blades, which are then transferred to the rotating shaft of the generator. The hub structure is fitted with 3 radial flares.
- Base assembly. The base assembly is mainly composed of a base, a lower platform assembly, an inner platform assembly, and a cabin ladder. It is connected with the tower through the yaw bearing, and drives the engine room assembly, the generator assembly and the pitch system assembly through the yaw system.
How wind turbines work?
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 structure of the generator is generally composed of the nacelle, rotor blades, shaft center, high-speed shaft and its mechanical brake, generator, yaw device, electronic controller, hydraulic system, cooling element, tower, anemometer and wind vane, tail rudder. Wind turbines are generally composed of wind turbines, generators (including devices), regulators (tails), towers, speed-limiting safety mechanisms, and energy storage devices.
The working principle of the wind turbine is to drive the impeller to rotate through the wind, and then increase the speed of the transmission system to achieve the speed of the generator, and then drive the generator to generate electricity, which effectively converts the wind energy into electricity. According to current windmill technology, it is about three meters per second of breeze speed (the degree of breeze) to start generating electricity.
The simplest wind turbine can be composed of two parts: an impeller and a generator, and it is built on a tower trunk of a certain height. This is a small off-grid wind turbine. When the electric energy emitted by the original wind turbine changes with the wind, sometimes there is no voltage and frequency instability, and there is no practical application. Value To solve these problems, modern wind turbines add gearbox yaw system, hydraulic system, braking system and control system, etc.