INTEGRATED DUAL DEGREE WITH B.TECH IN ELECTRICAL ENGINEERING AND M.TECH IN POWER ELECTRONICS

Abstract

Benefits of the AC motor over the DC motor and steady increase in industrial standards and automation where speed of rotation is of primary concern and its exercising control over its speed is the necessity has led to the development of various control strategies to efficiently control the speed of an AC motor. To implement the various control strategies, an efficient power modulator would be needed which could provide the necessary power to AC motor as desired by the control strategy. The power modulators are expected to ensure they provide the power to the motor as desired as well as improve the quality of the power it takes from the grid. An overview of AC-AC regulators is done with emphasis on Matrix converters. Matrix converters and their various topologies are studied and simulated with. For the induction motor controlling to achieve variable speed, Vector Control (VC) or Field Oriented Control (FOC) have become the industrial standard. The vector control technique decouples the two component of stator current: one is responsible for controlling torque and other is controlling flux independently as in the case of separately excited fully compensated DC motor. Artificial Neural Networks or ANNs have been of special interest in the recent times, with their ability to learn instead of being programmed coupled with inherent ability to carry out parallel processing of data. This means they can fit highly non-linear functions and do calculations fast making them ideal tool in the control of induction motor drive. A novel neural controller has been studied which able to do slip calculations and matrix rotations in the original field oriented control of motor. A through study of the steps involved in the process is done along with simulations. The analysis has been carried out on the basis of result obtained by numerical simulations. The simulation and evaluation of matrix converter and the neural network controller is performed using a fed three phase squirrel cage induction motor for a 2HP rating.