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Wind Turbines

The working principle of a wind turbine is relatively simple. The wind wheel rotates under the action of wind. It converts the kinetic energy of the wind into the mechanical energy of the wind turbine shaft. The generator rotates to generate electricity under the drive of the wind turbine shaft. Broadly speaking, wind energy is also solar energy, so it can also be said that a wind turbine is a type of thermal energy generator that uses the sun as the heat source and the atmosphere as the working medium.

Material

Blade Material:Reinforced Glass Fiber

Description

Wind Turbine Wind Power Plant:Home Wind Generators
Rated Voltage:24V / 48V/96V/120V
Generator type:3 Phase AC Permanent-magnet
Color:White
Rated wind speed:2 M/s
Warranty:3 Years

Definition

A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate, and finally outputs AC power. Wind turbines generally consist of wind turbines, generators, steering (tails), towers, speed-limiting safety mechanisms and energy storage devices.

Features

1. Carbon steel body, compact, safe.

2. Reinforced glass fiber blades,matched with optimized aerodynamic shape and structure.

3. Patented permanent magnet ac generator with special stator,effectively reduce torque.

4. Tail adopts mechanical yaw technique, making it survive storm and run safely.

5. With epoxy zinc rich primer and polyurethane anti-corrosion treatment.

6. Intelligent automatic grease injection, which ensure flexible running and durable life.

Basic structure

The working principle of a wind turbine is relatively simple. The wind wheel rotates under the action of wind. It converts the kinetic energy of the wind into the mechanical energy of the wind turbine shaft. The generator rotates to generate electricity under the drive of the wind turbine shaft. Broadly speaking, wind energy is also solar energy, so it can also be said that a wind turbine is a type of thermal energy generator that uses the sun as the heat source and the atmosphere as the working medium.

Principle

Engine room: The engine room contains the key equipment of the wind turbine, including gearboxes and generators. Maintenance personnel can access the nacelle through the wind turbine tower. The left end of the nacelle is the wind turbine rotor, namely the rotor blades and shaft.

Rotor blade: Captures the wind and transmits it to the rotor axis. On modern 600-kilowatt wind turbines, each rotor blade measures about 20 meters in length and is designed to resemble the wings of an airplane.

Shaft center: The rotor shaft center is attached to the low speed shaft of the wind turbine.

Low-speed shaft: The low-speed shaft of the wind turbine connects the rotor shaft center with the gear box. On modern 600-kilowatt wind turbines, the rotor speed is quite slow, about 19 to 30 revolutions per minute. There are conduits in the shaft for the hydraulic system to stimulate the operation of the aerodynamic brake.

Gear box: The left side of the gear box is the low speed shaft, which can increase the speed of the high speed shaft to 50 times that of the low speed shaft.

High-speed shaft and its mechanical brake: The high-speed shaft runs at 1500 rpm and drives the generator. It is equipped with an emergency mechanical brake for use when the aerodynamic brake fails or the wind turbine is being repaired.

Generator: often referred to as an induction motor or asynchronous generator. On modern wind turbines, the maximum power output is usually 500 to 1500 kilowatts.

Yaw: Turn the nacelle with the help of a motor so that the rotor is facing the wind. The yaw device is operated by an electronic controller, which can sense the wind direction through the wind vane. The figure shows the yaw of a wind turbine. Generally, when the wind changes its direction, the wind turbine will deflect only a few degrees at a time.

Electronic controller: Contains a computer that constantly monitors the status of the wind turbine and controls the yaw device. To prevent any malfunction (ie, overheating of the gearbox or generator), the controller can automatically stop the rotation of the wind turbine and call the wind turbine operator through a telephone modem.

Hydraulic system: aerodynamic brake for resetting wind turbines.

Cooling element: Contains a fan to cool the generator. In addition, it contains an oil cooling element for cooling the oil in the gearbox. Some wind turbines have water-cooled generators.

Tower: The wind turbine tower contains a machine cabin and a rotor. Tall towers usually have an advantage because the higher the ground, the higher the wind speed. The tower height of modern 600 kW wind turbines is 40 to 60 meters. It can be a tubular tower or a lattice tower. The tubular tower is safer for maintenance personnel because they can reach the top of the tower through internal ladders. The advantage of the grid-like tower is that it is relatively cheap.

Anemometer and wind vane: used to measure wind speed and direction.

Rudder: Small wind turbine (usually 10KW and below) in the wind direction on the horizontal axis. Located behind the slewing body and connected to the slewing body. The main role is to adjust the fan’s steering so that the fan is facing the wind direction. The second effect is to make the wind turbine head deviate from the wind direction under the condition of high wind and wind, so as to reduce the speed and protect the fan.

Classification

1, asynchronous
(1) Cage asynchronous generator; power is 600 / 125kW 750kW 800kW 12500kW
The stator sends 50Hz AC power of different power to the grid;
(2) Wire-wound doubly-fed asynchronous generator; power is 1500kW
The stator transmits 50Hz AC power to the power grid, and the rotor is controlled by the inverter, which indirectly transmits active or reactive power to the power grid.

2, synchronous
(1) Permanent magnet synchronous generator; the power is 750kW, 1200kW, 1500kW. The magnetic field is generated by the permanent magnet, and the stator output is fed to the grid with 50Hz AC power after full power rectification and inversion.
(2) Electrically-excited synchronous generator; a magnetic field is generated by a DC current externally connected to the rotor, and the stator output is fed to the grid with 50Hz AC power after full-power rectification and inversion.

According to the blade form, the existing wind turbines are divided into the following two categories:

3, the horizontal axis
The most used form in the world at present, the maximum power is about 5MW.

4, vertical axis

Application

It can be built in rural, pastoral, mountainous areas, developing large, medium and small cities or near commercial areas to meet the electricity demand of local users.

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