The power factor of a synchronous motor is changed with a change in the excitation. When the excitation of the motor is increased, the power factor changes from lagging to unity and then to a leading power factor.
How the power factor can be controlled in the case of synchronous generator?
The power factor measured at the input terminals of a synchronous motor is adjusted to a required value using a fuzzy logic controller (FLC). … The control of reactive power flow and voltage magnitude in high voltage alternating current (HVAC) systems has become an important task.
How can we improve power factor?
You can improve power factor by adding power factor correction capacitors to your plant distribution system. When apparent power (kVA) is greater than working power (kW), the utility must supply the excess reactive current plus the working current . Power capacitors act as reactive current generators .
What is power factor correction?
Power factor correction is the process of compensating for the lagging current by creating a leading current by connecting capacitors to the supply. A sufficient capacitance is connected so that the power factor is adjusted to be as close to unity as possible. Consider a single-phase induction motor.
How do you test a synchronous motor?
TESTING THE SYNCHRONOUS MOTOR
The rotor can be tested with an ohmmeter for an open winding or a grounded winding. To test the rotor for an open winding, connect one of the ohmmeter leads to each of the slip rings on the rotor shaft, Figure 17–5.
Where do we use synchronous motor?
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.
What is the power factor of an RC circuit?
In a series RC circuit connected to an AC voltage source, voltage and current have a phase difference of ϕ , where cosϕ=R√R2+(1ωC)2 c o s ϕ = R R 2 + ( 1 ω C ) 2 . cosϕ is called the power factor.
How does excitation effect power factor?
A change in the excitation, thus, affects only the power factor of its output. … This reduces the terminal voltage slightly, so let the excitation of the first alternator be increased so as to bring the terminal voltage back to its original value.