electrical power in power generation

See numerous previous threads on CR4 or the below links (which you should have looked at first by the way).

http://en.wikipedia.org/wiki/AC_power

http://www.google.co.nz/search?hl=en&source=hp&q=reactive+power&meta=&aq=f&oq=

Reactive power in AC circuit is the wastes power that store inside the reactive loads such as inductors and capacitors, yet the fact, that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. The measurement s in a unit called Volt-Amps-Reactive (VAR), rather than watts.

It does not do anything. They just stay inside the component.

Unfortunately there is a lot of confusion about the active and reactive powers.

The active power is one which can be converted to another form of power (eg mechanical) being in the real field.

However the reactive power is the one which can not be converted to another form of power.

However is it totally waste? No.

Let us think of it as in a mechanical system.

The spring, flywheel etc what are their function? Ideally they store the power and release them when required.

Do they convert the powers? no, that is not their function. When ever extra speed is put on by the prime mover a portion of that is absorbed by the flywheel (as kinetic energy) and released when the speed of prime mover goes down. You can see the similar thing done by spring (in terms of its potential energy). Their primary purpose is to smoothen the ride.

The similar function is done by the inductors and capacitors. Whenever current goes up, a portion is absorbed by inductor and released when it ges down, and the capacitor does it for the voltage.

The additional action done by the inductor is the setting up of the magnetic field. And since it is with the differential operator, it will be reactive. And any way it is again the stored energy and so will be on the exchange and not conversion.

Hence though the reactive power is not wanted but still it is necessary. What we try to do is compensate them (inductor with capacitor) so that the supply and demand are met locally without importing (from the generators).

Hope it is not too difficult to understand.

reactive power in AC is used to transfer the real power from one place to another place in that criteria we are generate the reactive power by usage of series and shunt capacitors,svc etc

As was said there is useful reactive power needed for creation of the flux in motors converted in the end into work produced by the motors, and "useless" (if not to say harmfull) reactive power being returned into mains (circulating between the supplier and the consumer of el energy) which overload the lines and partly dissipates in the form of heat (so, wasting the el. energy).