Table of Contents
What is modeling of synchronous machine?
Modeling of synchronous machines is essential for power systems analyses. As a gen- erator, it determines the electric characteristics of the power system, especially for the system security, the ability to withstand sudden disturbances such as faults, switching, and load changes [9–11].
What is a generator model?
Generator models are the most complex models in a transient stability tool. Generators can have many classes of dynamic model assigned to them including the following types. Machine Model (or converter model for renewal. Exciter Model (or electrical control for renewable)
What is the equation of synchronous generator model?
Eph = Average value x form factor Equation (1) shown above is the EMF equation of the Synchronous Generator. The Coil Span Factor is defined as the ratio of the induced emf in a coil when the winding is short-pitched to the induced emf in the same coil when the winding is full pitched.
What is the principle of synchronous generator?
The principle of operation of synchronous generator is electromagnetic induction. If there exits a relative motion between the flux and conductors, then an emf is induced in the conductors.
What is Q axis in synchronous machine?
A quadrature axis is one whose magnetic effect is along the perpendicular to field pole axis. When the peak of armature mmf coincides with the quadrature axis, the reactance offered to the armature mmf is called Quadrature Axis Reactance.
What is the role of synchronous motor in power system?
One advantage of the synchronous motor is that the magnetic field of the machine can be produced by the direct current in the field winding, so that the stator windings need to provide only a power component of current in phase with the applied stator voltage—i.e., the motor can operate at unity power factor.
What are the two types of generator?
There are two fundamental types of generators known as AC (alternating current) and DC (direct current) generators. While the technique of producing electricity is the same in both types, AC and DC power become different in terms of their applications – the way in which loads receive electric power.
Do generators produce AC or DC?
While generators feature a stationary field in which the conductor rotates to produce electromagnetic induction, an alternator’s entire magnetic field turns with its conductors remaining stationary. Generators are capable of both AC and DC power.
What are the types of synchronous generator?
This type of synchronous motor is divided into three categories and is available in three designs, each of which has unique features:
- Hysteresis Synchronous Motors.
- Reluctance Synchronous Motors.
- Permanent Magnet Synchronous Motors.
What is excitation EMF?
The process of generating a magnetic field by means of an electric current is called excitation. Field coils yield the most flexible form of magnetic flux regulation and de-regulation, but at the expense of a flow of electric current.
What are the two types of synchronous generators?
Types of synchronous machines
- Hydrogenerators : The generators which are driven by hydraulic turbines are called hydrogenerators. These are run at lower speeds less than 1000 rpm.
- Turbogenerators: These are the generators driven by steam turbines.
- Engine driven Generators: These are driven by IC engines.
Why is excitation always DC?
To keep it short we can conclude that to get steady state torque and to synchronize the rotor we use dc excitation. If you use AC excitation, flux will be alternating. For dynamically induced emf, you need a constant flux (provided by DC excitation) and a rotating coil. This is the basic principle of DC/AC generator.