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Synchronous generators are traditionally driven at a constant speed to maintain the fixed frequency of the generated electricity. However, with advancements in power electronics and control systems, it is possible to drive a synchronous generator at variable speeds by using technologies like electronic converters to adjust the frequency of the output power to match the grid.
What else can I help you with?
What two factors determine synchronous speed?
Synchronous speed is determined by the number of poles on the motor and the frequency of the power supply. Mathematically, synchronous speed (in RPM) can be calculated as 120 times the frequency of the power supply divided by the number of poles.
How can you calculate the inertia constant for ac generator?
Calculating system inertia by mutiplying the Inertia Time Costant [Sgn] of every single generator to calculate the inertia of the generator and sum all inertias to calculate the whole system inertia Calculating system inertia from the RoCoF (post fault calculation)
What is the difference between Variable Speed Drive and Variable Frequency Drive?
A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFD's vary the speed of an AC motor by varying the frequency to the motor. VSD's referring to DC motors vary the speed by varying the voltage to the motor.
What is the variable speed or acceleration?
Variable speed refers to an object or system changing its velocity over time, while variable acceleration refers to a change in the rate of change of velocity over time. Both variable speed and acceleration are commonly encountered in real-world scenarios where the motion of objects is not constant.
What changes to an electric generator are required to increase frequency?
To increase the frequency output of an electric generator, the speed of rotation needs to be increased. This can be achieved by either increasing the mechanical input driving the generator, such as through a higher rotational speed or by adjusting the number of rotor poles in the generator. These changes will result in the generator producing electricity at a higher frequency.
When alternator will act as induction generator?
when its speed becomes greater than the synchronous speed.
What is synchronous machein?
mainly alternator,synchronous motor comes under the synchronous machine.a synchronous motor is not a self starting motor.if a synchronous motor moves with more than synchronous speed then it acts as a synchronous generator.
Difference between induction motor and induction generator?
in case of induction motor the rotor speed is less than synchronous speed giving positive slip but in case of generator the rptor speed is greater than synchronous speed giving negative slip.......
What factors determine the synchronous speed of an AC motor?
Number of poles and supply freqency determines speed of synchronous motor. For speed control of such motors Variable Freqency Drives(VFD) are used.
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.
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.
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.
Why do you use induction generators in wind generation rather than synchronous generators?
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..
What are the advantages of induction motor?
1. Induction motor has high starting torque, therefore use for operate pump which need high starting torque. 2. Induction motor operate on variable speed. 3. It can be used as generator when speed of motor is higher than synchronous speed.
What is a synchronous motor?
Synchronous motors are those that run only at Synchronous speed ie.. constant speed.
Why is speed not normally used to control the armature voltage of a synchronous alternator?
Because if speed was used, the power system frequency would be changed. A synchronous generator spins at synchronous speeds. Synchronous generators 101: A typical synchronous generator will have a field winding (typically on the rotor, or rotating part) and a stator winding (the stationary part where power is supplied to the power grid). Current is injected into the field winding, turning it into an electromagnet. This field current is controlled by the Automatic Voltage Regulator (AVR). The more current supplied to the field winding, the stronger the electromagnet becomes, and the more power is required from the prime mover (whatever is supplying the power - steam turbine, for example) to keep the generator spinning at synchronous speeds.
Why are synchronous generators called synchronous?
somthing that sycronizes stuff in a genorator
