الفهرس 
INTRODUCATIONOnly 14 pages are availabe for public view
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Abstract
Control of induction motor drives constitutes a vast subject and the technology has been advanced in recent years. Control of AC drives in general are considerably more complex than those of DC drives and this complexity increase substantially if high performances are required.
Scalar control technique (V/F) is used because of simplicity of its control algorithm implementation. Complete system consists of a diode bridge rectifier and Inverter. The output voltage of Inverter decreased below the desired value, also motor speed decreased due to the losses of the inverter elements. The decrease of inverter output voltage leads to a change in the characteristics of the motor. The used of boost converter will overcome this problem and leads to almost fixed value between the voltage and frequency.
Here in this thesis, V/F method for speed control and efficiency enhancement is discussed. Complete proposed system is simulated using MATLAB/Simulink. Simulation results on induction motor are compared with practical experiment results. The proposed configuration shows that, usage of the boost converter compensates the voltage DROP of the inverter. Usage of boost converter compensates for the voltage DROP of the inverter by a percentage of 10%. Also, the efficiency rises to 98%. By adding the boost converter to the circuit, the motor speed becomes faster compared with the circuit without boost converter by reducing time to 37.5 %. The starting of stator current is reduced by a percentage of 40%. The transient time of stator current, motor speed and electromagnetic torque are minimized by a percentage of 37.5 %. Using the boost converter leads to almost fixed value of (V/F) between the voltage and frequency, so the torque is kept constant.