Why are synchronous generators used in power plants?

Synchronous generators are commonly used for variable speed wind-turbine applications, due to their low rotational synchronous speeds that produce the voltage at grid frequency. Synchronous generators in variable speed operation will generate variable voltage and variable frequency power.

Which type of synchronous generator is used in thermal power plants?

Detailed Solution. The majority of power plants use three-phase non-salient pole synchronous generators (Turbo generator).

What is the function of synchronous generator?

Definition: The synchronous generator or alternator is an electrical machine that converts the mechanical power from a prime mover into an AC electrical power at a particular voltage and frequency. The synchronous motor always runs at a constant speed called synchronous speed.

What type of generator induction or synchronous is used in power plants?

An induction generator or asynchronous generator is a type of alternating current (AC) electrical generator that uses the principles of induction motors to produce electric power. Induction generators operate by mechanically turning their rotors faster than synchronous speed.

What are the advantages of synchronous motor?

The advantages of the synchronous motor are the ease with which the power factor can be controlled and the constant rotational speed of the machine, irrespective of the applied load. Synchronous motors, however, are generally more expensive and a d.c. supply is a necessary feature of the rotor excitation.

How does synchronous generator produce reactive power?

Synchronous generators are normally equipped with automatic voltage regulators which continually adjust the excitation so as to control the armature voltage. They are always loaded below their natural loads, and hence generate reactive power under all operating conditions. Loads normally absorb reactive power.

Where are synchronous generators used?

Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines and hydro turbines into electrical power for the grid. Some designs of Wind turbines also use this generator type.

Why is it called synchronous generator?

A synchronous generator is called “synchronous” because the waveform of the generated voltage is synchronized with the rotation of the generator. Each peak of the sinusoidal waveform corresponds to a physical position of the rotor. The magnetic field of the rotor is supplied by direct current or permanent magnets.

What is the use of synchronous?

Synchronous motors are normally used in applications in which a constant and precise speed is required. Typical applications of these low power motors are positioning machines. They are also used in robot actuators. Synchronous motors are also used in ball mills, watches, record players, and turntables.