Worldwide wind turbines have steadily increased. They are very different in nature from conventional
generators.
Induction generators in large scale are used in wind turbines for their simple construction and reliable
operation.
With the increase
in penetration of wind turbines, the power system dominated by synchronous
machines will experience a change in dynamics and operational parameters.
This paper aims to analyze the impact of induction generators on transient and small signal stability of
power systems by gradually increasing the rate of power generated by wind turbines and changing the
location of these turbines in the power system.
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 .
This paper presents an important idea about the higher harmonics (both temporal and
spatial) and the reason of their appearance and negative effects they cause on the electrical
power consumers. Generated rotating torques from upper harmonics is th
en calculated, and
their effect on the mechanical characteristics of the induction motor, and how to mitigate
this effect depending on motor design.
Higher harmonics produce additional electrical and magnetic losses in induction
motors which increase the motor’s heat and decrease its energy yield and power
coefficient. This research shows how to decrease these losses to improve the mechanical
characteristics of the induction motor and enhance the performance.
