Due to the large and rapid increase in the demand for electricity and the gradual decline of
non-renewable sources of energy (fossil fuels, etc.), the performance of electrical systems
has to be developed so the use of distributed generation and it
s connection with the main
networks is one of these methods but this linkage causes some problems like changing in
electrical voltage.
In this research a radial electric distribution system was simulated and studied the effect of
distributed generation on electrical voltage stability -in static and dynamic state-and its
effect when the generator is synchronous or induction.
In this research we give a pattern that explain how to simulate
the wind farms via Etab. We use induction generator technique
(WTIG). We can see through results that this method is the
best way in reducing the power losses and building-cost.
This paper presents an analytical and laboratory study of the
behavior and evolution of the symmetrical components of both
voltage and current of a three-phase induction motor as a function of
the load torque applied to it and to increasing in the
imbalance which
effect the electrical grid. The effect of unbalanced voltages in the
voltage source will be also examined on the distribution of motor
currents in the three lines and on its performance.
This paper presents an accurate mathematical model of threephase
induction motor for both transient and steady-state studies. this
model takes into account the network harmonics, Skin Effect and
Stator and Rotor Magnetic Saturation. and to be able
to present the
real motor and its internal physical phenomena better than the
existing classical models.
The purpose of research is to build a model of the electric driving system for threephase
squirrel-cage induction motor using oriented electric field method so as to control
both the speed , flux and current, ( PI ) controllers was used .
The mach
ine model has been formed based on the equations of the machine written
in the stationary coordinates .
To complete the process of control without measuring the rotor flux , a model of flux
from the measured values of stator current and rotor speed was build, and it can be
measured directly .
In this paper a robust control using a sliding mode control of the active and the
reactive power generated by a doubly-fed induction generator (DFIG) is
presented. It provides a robust regulation of the stator side active and reactive
power by cur
rents and it is suitable for both electric energy generation and
drive applications. The mathematical model of the machine written in an
appropriate d-q reference frame fixed with a stator flux in order to obtain the
decoupled system of control. In this case the control of the active and reactive
power flowing between the stator of the DFIG and the power network is
synthesized using sliding mode controllers. A good performance tracking is
guaranteed in terms of stator currents references.
