PWM-DRIVEN INDUCTION MOTOR CONTROLLER: STATE SPACE APPROACH

In adjustable-speed drive applications, the range of speed and torque achievable is
very important. A power electronic converter is needed as an interface between the
input AC power and the drive. A controller is needed to make the motor (drive),
through the power electronics converter meets the drive requirements. The widely
used conventional control that is based on mathematical model of the controlled
system is very complex and not easy to be determined since it requires explicit
knowledge of the motor and load dynamics.
This final project report is a design and implementation of a state space controller
from a for a PWM-driven variable-voltage variable-frequency (VVVF) speed control
of an induction motor and the analysis, evaluation and improvement of the control
strategies. A simulation model in MA TLAB/Simulink is developed using state space
approach to perform verification of the controller. To provide stability in response to
sudden changes in reference speed and/or load torque, details study on the pole
placement method used in the system will be conducted.
Detailed evaluations of the controller's performance based-on a pre-defined
performance indices under several conditions are presented. The findings
demonstrate the ability of the control approach to provide a viable control solution in
response to the different operating conditions and requirements.