Generating power plant
Figure shows the various parts of a wind-electric
generating power plant. These are:
turbine or rotor.
mill head –it houses speed increaser, drive shaft, clutch, coupling etc.
Figure: Wind-Electric generating
most important component is the rotor. For an effective utilization, all
components should be properly designed and matched with the rest of the
wind mill head performs the following functions:
(i) It supports the rotor housing and the
(ii)It also houses any control mechanism incorporated like
changing the pitch of the blades for safety devices and tail vane to orient the
rotor to face the wind, the latter is facilitated by mounting it on the top of
the supporting structure on suitable bearings.
· The wind turbine may be located either unwind or downwind
of the power. In the unwind location the wind encounters the turbine before
reaching the tower. Downwind rotors are generally preferred
especially for the large aerogenerators.
supporting structure is designed to withstand the wind load during
gusts. Its type and height is related to cost and transmission system
incorporated. Horizontal axis wind turbines are mounted on towers so as to be
above the level of turbulence and other ground related effects.
of Wind Machines
Wind machines (aerogenerators) are generally classified as
axis wind machines.
axis wind machines.
Horizontal axis wind machines. Figure shows a schematic arrangement
of horizontal axis machine. Although the common wind turbine with
horizontal axis is simple in principle yet the design of a complete system,
especially a large one that would produce electric power economically, is
complex. It is of paramount importance’sthat the components like rotor,
transmission, generator and tower should not only be as efficient as possible
but they must also function effectively in combination.
Figure: Horizontal axis wind machine.
Vertical axis wind machines. Figure shows vertical axis type wind
machine. One of the main advantages of vertical axis rotors is that they
do not have to be turned into the windstream as the wind direction changes.
Because their operation is independent of wind direction, vertical axis machine
are called panemones.
Figure: Vertical axis wind machine.