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Title: Comparative Analysis between ACS800 VFD and Conventional DTC using Different Speed Estimation Methods to Control Three-Phase Induction Motors
Authors: Anas Wael Nassar 
Supervisor: Dr. Osama Al-Naseem
Degree Awarded: Master's Degree in: Electrical Engineering
Keywords: ABB ACS800, AC machine drives, direct torque control, extended Kalman filter, induction motor speed estimation.
Issue Date: 2019
Publisher:  Kuwait university - college of graduate studies
Abstract: Induction motors are widely used in most industrial applications nowadays due to their low cost, simplicity of design, good self-starting capability and low maintenance requirements. The main challenge for engineers was the complexity of the control since the induction motor has a highly nonlinear model. Another challenge was the difficulties of measuring the motor states as most of the states cannot be measured directly and are highly dependent on the motor physical parameters which in turn can vary based on the operating condition. Direct torque control is one of the methods that has been introduced in research in mid-eighties and implemented in early nineties. Among several developed methods, DTC is very simple to implement and it has a very fast transient response and an accurate steady state performance. ABB has developed several drives which integrate the DTC with adaptive state estimation and parameter identification techniques. ACS800 is one of the most developed and widely used sensorless drives based on DTC and over the years it has proven robust and accurate performance. In this research work, the simulation of IM controlled through a sensorless DTC has been carried out for different loading conditions and using three different adaptive estimation techniques. The same IM has been connected to ACS800 and the performance of ACS800 has been monitored and analyzed. The performance of both, the simulation and the ACS800 drive have been compared and evaluated. The effect of each estimation method on DTC performance has been determined and the choice is made on which method is the most recommended to be adopted in commercial drives.
Appears in Programs:0610 Electrical Engineering

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