The electrical power generated must be AC exactly phase synchronized with the AC on the power grid. If it is not synchronized the generators will take power from the grid and try to run as motors and probably severely damage themselves and maybe other parts of the power plant.
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
If you use synchronous generator... you need rotor to rotate always in synchronous speed... practically it s not possible always to produce that speed by air flow... Air flow always varies...But using induction generator, you need to get speed to make slip as positive value.. it is always possible...so induction generator is best one..
To improve the power factor
Generating Capacity : Power plant has very high generating capacity as compared to gen set.Size of the equipment : Size of the alternators are compatibly very big in Power plants.Type of Prim-over : In Power plant turbine is used to for prime over or to provide mechanical power to rotor of the alternator whereas in generating set diesel engine is used for prim-over.
The load on a generator is a general word for whatever device is connected to it to use the power that is being generated.
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
This is not entirely true. In small power stations not connected to grids and wind turbines they usually use induction generators instead of synchronous for their capability of producing energy at varying rotor speeds and their price which is lower the synchronous generators. Before I tell you why they use synchronous in big power stations connected to the grid you must know that usually you have more than one power plant connected to the grid. And if you want the power of each power plant to be added to the grid you need the all the alternating currents to be in phase so the frequency must be the same. And as you probably know they are called SYNCHRONOUS generators because the speed of the rotor (the frequency) is the same as the AC supply current. So obviously it will be much easier to control the frequency of a synchronous generator and therefore easier to synchronize with the grid.
To drive a steam turbine which is coupled to an electrical generator
A synchronous condenser is physically an electric generator/motor without a mechanical power source. Electrically a synchronous condenser changes the timing between rise and fall of current compared to voltage (phase angle). They also use stored energy to smooth small power fluctuations.
If you use synchronous generator... you need rotor to rotate always in synchronous speed... practically it s not possible always to produce that speed by air flow... Air flow always varies...But using induction generator, you need to get speed to make slip as positive value.. it is always possible...so induction generator is best one..
One could but there would be additional losses. Older frequency changers use a synchronous motor to turn a synchronous generator with a different number of poles to change frequency. I have seen these used in woodworking. An example is to use a two pole motor to turn a four pole generator to generate power at twice the line frequency. A More modern solution would be to use semiconductors which would also allow the output frequency to be varied.
To improve the power factor
The generator in a nuclear power plant converts the mechanical energy from the steam turbine into electrical energy through electromagnetic induction. The rotation of the turbine spins the generator's rotor within a stationary magnetic field, generating electricity that can be distributed to power grids for use.
Yes, you can. A generator can power your house for a few hours but it has limited power.
Click the link. There you can figure the size generator you need.
1- can operate in generator/ motor mode for both sub/ super-synchronies speed mode with four possible operation conditions 2-A speed variation of ±30% around synchronous speed can be obtained by the use of power converter of 30% of nominal generated power 3-it has not necessarily to be magnetised from the power grid since it can be magnetised from the rotor circuit too 4- the size of the converter is not related to the total generator power but to the selected speed range and hence to the slip power
to use prime mover