Mechanical energy which in turn produces a
alternating current and voltage which is called the electrical energy and then we get the
electrical output. Working of wind turbine-how does actually a wind turbine works; as we
all know there is inflow of wind, wind data velocity is first of all analyzed and the
wind rotates the blades. The blades are cut in such a pitch angle to rotate the blades.
There is a inflow of the wind which will pressurize the difference in between the gaps of the
blades so that the wind blades can rotate in the rated speed. The rotor is attached
to the main shaft of the body so that there is rotation of blades, blade is attached to
the rotor, rotor spins and so is the permanent magnets so permanent magnets in 3 phase coil
flux resulting in the 3 phase alternating output. Actually in out system there is no
gear system so this is just the general overview and working. In very large wind turbine for
example on shore type of wind turbine, we require very high power, there is actually
the gear system so in our system there is absence of the gear system. The wind data
analysis, we have analyzed the two years wind data analysis from the dhulikhel (Nepal) 2015
and 2014 wind data analysis. As we can see the wind data analysis, this is actually the
average wind data and still there is maximum wind data which can reach upto the 15 m/s
at Dhulikhel. If we see from here, then at least 6 to 7 months per year we can work out
in between 6 to 7 m/s as working wind data. The same pattern again increases on the next
year so if we this, the same pattern is for 2015 and 2014. Wind direction frequency module-this
is the actually the wind direction in which major part of the wind occurs and this suggests
that there is 247 degree wind flow at Dhulikhel. So this is the wind speed Vs wind direction
analysis as we can see, from 6 to 7 m/s there is maximum wind flow as at 247 degree. This
is some of our figure we have designed for turbine. These are actually the permanent
magnets which are placed in the rotor and there are many permanent magnets inside the
rotor. The right one is the voltage testing, placed of very low dia which carries very
low current only for the testing. This is the magnetic placement in the rotor and this
is the voltage testing. This is the coil design and the connection, which we have ourselves
designed the coil at star connection of 120 degree 3 phase output. From the 3 phase output
star connected, we have placed a diode. The right one is the simulation analysis to produce
a dc output. In testing of our wind turbine, this is the no-load testing, came upto 130V
at no load at 500 rpm and we step down the voltage to increase the current for 12V LED
light glow. If we analyze the power output vs wind speed, we are able to extract the
wind data of 500W initiating from the 5 m/s and cut out wind speed is at 15 m/s. Power
output vs rpm analysis-we can see 500W at 200 rpm (rated). So this is general view of
the blade dynamics. I have explained before. So we have some of the blades designed in
our workshop. This is the leading end and cut in end at 120 at the angle at the root.
So power generally depends upon the cube of the velocity of the wind. Power is directly
proportional to the R square times the velocity of the wind cubed. So these are some of the
blade design we have made in our lab. These are for testing we have tested significantly.
Some of the designs and site installation aspects, this is the hub and this is the site
installation. Finally I would like to conclude some of the points. The design of the wind
turbine can be made from the locally available resources. The wind energy of 500W can be
installed in our household for activities and can be lit the household. Wind energy
can solve the problem of electricity in developing country like Nepal and research environment
must be encouraged by government. Thank you for listening.