چكيده
Abstract:
Induction motor drive has great importance because of its significantly
industrial applications. Squirrel cage induction motors are generally
controlled by varying voltage and frequency fed to the motor. Squirrel cage
induction motors have less application in high power. So wound rotor
induction motor is used instead of it. In induction motors, a part of air gap
power that is not converted to mechanical power, is called slip power. In
these motors speed is controlled by energy absorption from rotor and
returning it to the network that it will improve the efficiency. In usual
systems, AC-DC-AC converters are used for returning slip energy to the
network but the existence of dc link causes increase of size and losses. In
this thesis a structure for slip power recovery is presented that a new type
of AC-AC converter that is called Matrix Converter is used instead of ACDC-
AC converter. Matrix Converter is as a static frequency changer in a
slip energy controller for induction motor speed. Matrix Converters are a
new type of power electronic converters which can directly connect mphase
of input to n-phase of output with different amplitude and frequency
from input phases without use of dc link. Special advantages of this type of
converter is the reason for the tremendous interest of many military,
commercial and research centers in recent years, and it is trying in the way
of getting these converters commercial and industrial by solving the most
problems they have in this way. In this thesis, Simulation of Matrix
Converter application in slip power recovery method in speed control of
Wound Rotor Induction Motor is done in Matlab/Simulink program and the
results are presented.
