Wind turbines convert the kinetic energy of wind into mechanical power using rotor blades, which spin a shaft connected to a generator to produce electricity. The main components are the blades, shaft, gearbox, nacelle, generator and tower. The blades capture the wind's kinetic energy and turn it into low-speed rotational energy, which spins the shaft. The gearbox converts this into high-speed rotation to power the generator, which converts the mechanical energy into electricity. The nacelle houses the gearbox, generator and other components, while the tower elevates them to access faster winds.

1. How wind turbine works
Wind turbines are used to generate electricity from the kinetic power of
the wind.
Wind turbines convert the kinetic energy in the wind into mechanical
power. This mechanical power can be used for specific tasks ( a
generator can convert this mechanical power into electricity)
The energy in the wind turns two or three propeller-like blades around a
rotor. The rotor is connected to the main shaft, which spins a generator
to create electricity.

2. Main components of wind turbine are shown below:

3. Main components of wind turbine
Rotor Blades:
Converts kinetic energy of wind into rotational energy of shaft that is
connected to nacel le. As wind passes through the blades, a pressure
differential is created between the upper and lower surface of blade which
creates a lift that is perpendicular to the direction of wind.
The WTG consists of three blades madeof glass fibre-reinforced plastic; the
length of the blades is 37.5 meter.
The blades are directly bolted to the hub.
Hub
The hub is fixed to the rotor shaft
which drives the generator through
a gearbox. The blades are directly bolted
to the hub and hence are controlled by
the help of motors installed inside the hub.

4. Nacelle:
Nacelle is a casing that holds Drive shaft, gearbox and generator, yaw
Motor drive, brakes, anemometer and controller.
The nacelle is made of fiber-rein forced plastic and designed in a way to
protect
internal components against various ambient conditions.
It also ensures adequate noise dampening.

5. Shaft: transfers the rotational energy of rotor into generator .
Shaft which spins a generator to create electricity
Gearbox: converts the low speed shaft of rotor to a high speed
shaft connected to generator.
Gearboxes are made up of cast steel with one planetary two
spur gear stages.

6. •Wind power generators convert
wind energy (mechanical energy) to
electrical energy.
•The generator is attached at one
end to the wind turbine, which
provides the mechanical energy.
•At the other end, the generator is
connected to the electrical grid.
•The generator needs to have a
cooling system to make sure there is
no overheating.
Generator:
produces electricity of medium voltage through electromagnetic induction

7. Yaw drive :
rotates the turbine to keep it in the direction of wind for maximum output.
Yaw system
The yaw drive is an important component of the horizontal axis wind
turbines' yaw system. The yaw system comprises of geared motors and
brakes. The yaw drive is used to keep the rotor facing into the wind as the
wind direction changes.

8. Brakes: are used to stop the turbine in case of high wind speed to
protect the blades and power overloading. It can also be done by
changing the Pitch of blades.

9. Controller :
monitors the entire system and controls all the operation.

10. Anemometry System
The main function of the anemometry system is to accurately measure and
record Wind Speed, Wind Direction, Ambient Temperature, Humidity and
other necessary information relevant to the site conditions. This information
is monitored and transmitted at the same time to many set locations. The
anemometry system comprises of two Wind Masts, Wind Mast is mounted with
a Data Logger installed at 80 meters height, equivalent to the turbine height.
These data loggers are calibrated in accordance with applicable standards;

11. Tower: Tower holds the entire structure at height.
The tower height of every WTG is 80 meters, equipped with internal tower
ladder along with safety harness & elevator. The tower supports the nacelle
assembly which holds the hub along with the blades.

12. Electrical system:
It takes the electricity from top to the bottom of the tower . The installed Wind
turbines use Asynchronous generator whose shaft is connected with a gear box
which is coupled with Hub blades. The WTG produce 690 Volts, which after
synchronization thru a frequency converter is stepped up to 22kV. It is then sent
to a substation where it is stepped up through power transformers to 132kV

13. Electrical Layout:
The installed Wind turbines use Asynchronous generator whose shaft is
connected with a gear box which is coupled with Hub blades. The WTG
produce 690 Volts, which after synchronization thru a frequency converter is
stepped up to 22kV through Generator, Step up transformer installed with
each turbine. Each WTG is connected with its own Ring Main Unit switchgear.
The voltage produced by each WTG is fed into system thru Ring Main unit
switchgear is interconnected with other RMUs by underground power cables
and fed into MV substation at the site.
The 22Kv is then stepped up through power transformers up to 132kV & then
power is evacuated into 132kV national Grid.

14. Auxiliary Plant Facilities
Earthing System
The earthing system is erected together with the foundation.
Safety for persons: The ring earthing reduces the shock hazard voltage for
persons being near the tower foundation during a lightning stroke.
Operational safety: The deep earthing guarantees a low and stable earth
resistance for the whole earthing system.
Lightning protection
The lightning and overvoltage protection for the overall system follows the
concept of lightning protection zones.
The wind turbine is equipped with a complete external and internal lightning
protection system considering a direct lightning stroke. to the ground.
Fire protection
Most components of the wind turbine generator system are predominantly
metal. This applies, for example, to the tower, the machine supports, shaft,
gear unit, hydraulic unit, brake, generator, clutch, drives, etc.
A temperature sensor is installed in the machine house and measures the
temperature inside the machine house. If a certain limit value is exceeded, a
warning message is sent automatically to the remote monitoring office and the
system is automatically shut down.

15. Definition
SCADA=Supervisory Control & DataAcquisition
SCADA (Supervisory Control And Data Acquisition) system refers to the
combination of telemetry and data acquisition. It consists of collecting
information from turbines, transferring it back to a central site, carrying
out necessary analysis and control, and then displaying this data on a
number of operator screens.
The SCADA system is used to monitor and control a plant or equipment.
Control may be automatic or can be initiated by operator commands.
Basics

17. SCADA (Supervisory Control And Data Acquisition)
The wind turbines (Wind Park) are remotely monitored and controlled (at
site) through a SCADA system . This system is called GATEWAY and can
be used for online operation monitoring, processing of user-defined reports
and statistics as well as remote monitoring of Wind Turbines. Following
data parameters can be monitored by SCADA
Main features of the SCADAsystem:
• Park overview
• Park control
• Turbine overview
• Turbine control
• Log viewer
• Report Generator
• Power Curve
• 24h / 10m Log
• Production Overview Log
• Weather Station Data

19. Park overview
The park overview of the SCADA system provides a graphical overview of
the wind park indicating the status of each individual turbine. Furthermore,
current wind and production data are shown.
Park control
The park overview makes it possible to start/stop the entire wind park,
clusters of turbines or individual wind turbines. Furthermore, the park
control can be used for setting production limits for the wind park.
Turbine overview
The turbine overview of the SCADA system gives a full overview of all
relevant parameters of the wind turbine, for instance temperatures, pitch
angle, electrical parameters, rotor speed, yaw system, etc.
Log viewer
The SCADA system features a flexible browsing of the log data of the wind
turbine. All relevant log data are accessible and can be sorted by different
parameters.
Report generator
The report generator of the SCADA system makes it possible to make all
relevant reports based on the log data. The reports can be graphically
presented to provide the best possible overview.

20. Advantage and Disadvantage of Wind Power Plant
The wind blows day and night, which allows windmills to produce electricity
throughout the day. (Faster during the day)
Non-Polluting Resources : Wind energy has no cost, renewable source. It
is a source of clean non-polluting.
Cost Issue : Wind cost are much more competitive with other
technologies because there is no need of fuel to purchase and minimal
operating expenses. Although wind power has decreased its cost
dramatically.
Supply and Transport Issue : It is a big issue that wind energy
cannot stored and does not always blow when electricity is needed,
but wind generated electricity can be stored ,if batteries are
used , and further good wind sites are located in remote
location which is far from that area where electricity are required.

21. Environmental Concern :
Although wind power plants have little impact on the
environment as compared to fossil fuel plants ,there is some
concern over the noise produced by rotor blade and birds and
bats are also killed by flying into the rotor .
Sound from Wind Turbines
- Increasing tip speed  less sound
- The closest neighbor is usually 300 m  experiences almost no noise
• Environment study revealed that power lines are a much greater
danger to birds than the wind turbines.
• Some birds even nest on cages on Wind Towers.