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Why do power stations use synchronous generators and not induction generators?
Wiki User
∙ 11y ago
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.
Wiki User
∙ 11y ago
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If a three phase induction motor runs at a speed greater than synchronous speed?
When an induction motor is pushed over synchronous speed it will become a generator and will deliver power back to the utility.
Why you not usually use induction generator?
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
When the induction motor working as induction generator?
An induction motor connected to an existing ac supply normally runs at less than the synchronous speed by an amount described as the 'slip' which is proportional to the torque demanded at the shaft. If the same motor is instead coupled to an engine and driven at a speed higher than the synchronous speed, with negative slip, power then travels back into the ac supply and the motor has become a generator. The amount of power produced depends on the speed. However a normal induction motor will not behave as a stand-alone ac generator. For ac power generation synchronous generators are invariably used because it is necessary to set and maintain the frequency of the supply accurately.
Which motor rotate above synchronous speed?
An induction motor rotating at higher than synchronous speed would be generating power, thus would be a generator. No motor operating as a motor runs above synchronous speed.
What happen if a prime mover fails when two generators are in parallel?
It acts as synchronous motor by consuming power from the other generator....
Difference between synchronous generator and synchronous motor?
ASYNCHRONOUS is a mode whereby events happens irregardless of control. SYNCHRONOUS are this same events but controlled by a timing and/or control
Where does electrisity come from?
electrisity comes from big electricity generators .
Which type of the motor is used in fan?
Low-power (a few watts) might use a synchronous motor, most fans use an induction motor. Above a couple of horse-power it might be a 3-phase induction motor.
What is the difference between synchronous motor vs induction motor and which one is better?
The big difference is that the synchronous motor's rotor can have a variable current applied to it through its field slip rings. Both types of motors have their own advantages. With a synchronous motor in the system, the systems power factor can be regulated.
What are propane generators used for?
Propane generators are used to provide power should a power outage occur. Propane is a good option as it has a long shelf life and is readily available at most gas stations.
Do people in spain have an abundant energy source?
Spain has a number of coal powers stations and wind power generators. Spain is not wanting for power.
Why are synchronous generators used in thermal power plants?
For an alternating current (AC) grid, *every* alternator must be exactly in phase with every other. If not, one will attempt to feed power to the other, rather than adding to the power in the system. Synchronous alternators are easily controlled for speed, and therefore, for phase. As well, synchronous alternators can be made with no electrical contacts, so they are very long-lived and reliable. Be aware that *all* power plants connected to a grid use synchronous machines.
