| Summary: | The induction motor is the most common motor type used in industry. Analyzing its
performance is either concerned with steady-state behavior, or the transient behavior during
start-up and during system disturbances. Due to the advancement in power electronics,
induction motors are now commonly used in adjustable-speed drives. The harmonic
currents generated from these drives may result in voltage distortions and potential
resonance problems. Computer simulations of induction motor performance are therefore
more important than ever before. Although many simulation programs are available for
induction motor studies, the Electromagnetic Transients Program (EMTP) is probably
better than other simulation packages, because it contains detailed models of many other
power system components, such as transformers, transmission lines and thyristors, which
must be considered in certain types of motor simulations. This thesis presents a method of
using the existing EMTP synchronous machine model to simulate induction motor
transients. This approach allows simulations for both machine types using essentially the
same program code. The data conversion algorithm, which converts standard motor
specifications into equivalent circuit parameters, is explained. The steady-state initialization
of an induction motor is discussed as well. The start-up of an induction motor is simulated
using the proposed model. These simulation results are then compared with an independent
program which uses a 4th-order Runge-Kutta solution method. It is observed that the
results from the proposed model agree very well with the ones from the Runge-Kutta
solution method.
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