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When the synchronous motor is used as a synchronous condenser?
It is used as a reactive power compensator for power factor correction purposes. A synchronous motor running with no load will lead the current i.e. leading power factor like a capacitor. This synchronous motor running without load i.e. over excited is synchronous condenser.
Why do we use synchronous condenser?
A synchronous condenser provides step-less automatic power-factor correction with the ability to produce up to 150\% additional vars. The system produces no switching transients and is not affected by system electrical harmonics (some harmonics can even be absorbed by synchronous condensers).
How does a synchronous condenser work?
Working Principle of a Synchronous Condenser: A synchronous motor works on the principle of motional EMF that is, a conductor tends to rotate due to the effect of the magnetic field. To provide a magnetic field, two ways are used that is a three-phase AC supply and a constant DC power supply to the stator.
Why are synchronous generators called synchronous?
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.
Which device is suitable for a synchronous condenser?
Like capacitor bank, we can use an overexcited synchronous motor to improve the poor power factor of a power system. The main advantage of using synchronous motor is that the improvement of power factor is smooth.
Is a synchronous condenser a generator?
Synchronous condensers are considered as motors without any connected load or generators without prime movers. They produce or absorb reactive power. It is true that synchronous condensers were used at the dawn of electricity grids as the primary plant to regulate voltage, and hundreds of them were built and installed.
How does a synchronous generator?
In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field. The rotor is then turned by external means producing a rotating magnetic field, which induces a 3-phase voltage within the stator winding. The rotor of a synchronous machine is a large electromagnet.
When a synchronous generator is over excited it will be?
An over excited synchronous generator generates reactive power as its excitation is increased (over excited ) means the magnetic field strength of the stator winding of the synchronous generator is now increased more by increase in DC excitation , so in such a case more flux will induce in stator winding and when this …
How does a synchronous generator work?
An alternator or synchronous generator works on the principle of electromagnetic induction, i.e., when the flux linking a conductor changes, an EMF is induced in the conductor. When the armature winding of alternator subjected to the rotating magnetic field, the voltage will be generated in the armature winding.
How can a synchronous generator be started?
Today’s brushless, synchronous generators include an AVR. The machine is able to self-start by its residual magnetism: as soon as the machine rotates, a small output voltage is generated starting to feed a small current through the AVR to the exciter, which in turn increases the output voltage.
Where are synchronous condenser installed?
Installed at strategic intervals along a transmission system, synchronous condenser systems are either new electrical rotating equipment or existing turbogenerators reconfigured to perform as reliable grid stabilizers.
What is a synchronous condenser?
What is Synchronous Condenser (Capacitor) A synchronous condenser is the replacement of capacitor banks for P.F improvement in an electrical system. Its main benefit over capacitor banks is that its reactive power can be varied according to system requirements on a regular basis.
What are the applications of a synchronous generator?
These generators are used in the power industry in thermal power, hydropower, and generation of power in nuclear & diesel. These generators are applicable for changeable speed wind turbine applications because of less revolving synchronous speeds.
Why armature current is zero in synchronous condenser?
An overexcited synchronous motor without any load behaves like a huge capacitor to an electrical network. The V curve of a synchronous condenser is drawn in a given figure. As the active power provided to motor is 0, at unity P.F that means armature current is zero.
Are synchronous condensers the answer to the problem of inertia?
The use of synchronous condensers (re-purposed synchronous generators) certainly is a valid means of adding “inertia” to the system. But any increase in energy gained from them comes at the expense of frequency. So it is still a system dependent on “big spinning things”, which is exactly what we need to be getting away from.