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Answer Posted / mugunthan
Firstly, the output of power stations comes from a rotary
turbine, which by it's nature is AC and therefore requires
no power electronics to convert to DC.
Secondly it is much easier to change the voltage of AC
electricity for transmission and distribution.
thirdly the cost of plant associated with AC transmission
(circuit breakers, transformers etc) is much lower than the
equivilant of DC transmission
AC transmission provides a number of technical advantages.
When a fault on the network occurs, a large fault current
occurs. In an AC system this becomes much easier to
interupt, as the sine wave current will naturally tend to
zero at some point making the current easier to interrupt
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