Abstract
Whenever a squirrel cage induction motor is started, notable electromechanical torque and current pulsations occur. The adverse effects of starting torque pulsations and high inrush current in induction motor are eliminated using digital power electronic soft starting schemes that guarantee higher degrees of compliance of the requirements of an ideal soft starter for the induction motor. Soft starters are cheap, simple, reliable and occupy less volume. In this paper, an experimental setup of soft starting technique with extinction angle AC voltage controller and a speed and stator current based closed loop scheme is demonstrated using Artificial Neural Network (ANN) and Fuzzy Logic Control (FLC) by the way of MATLAB/SIMULINK based simulation. The ANN based soft starting scheme produces best results in terms of smooth starting torque and least inrush current. The results thus obtained were satisfactory and promising.
Highlights
It has been observed that when the three phase Squirrel Cage Induction Motor (SCIM) is started with Direct-How to cite this paper: Mohamed Faizal, A.A. and Subburaj, P. (2016) Intelligence Based Soft Starting Scheme for the Three Phase Squirrel Cage Induction Motor with Extinction Angle AC Voltage Controller
The conduction period in each half cycle is equal to the width of the pulse and the width of the pulse is a function of the reference and the magnitude of the reference, in the range of 0 to 1, in turn is decided by the Fuzzy Logic Control (FLC)/Artificial Neural Network (ANN) as per the operational requirements of the proposed soft starting system
A novel microcontroller based closed loop soft starting scheme using ANN and FLC is successfully demonstrated in this paper
Summary
It has been observed that when the three phase Squirrel Cage Induction Motor (SCIM) is started with Direct-. Subburaj on-Line (DOL) starting, the starting current reaches as high as seven to eight times the full load current This current, depending upon the size of motor may sustain for a short while typically 2 to 8 seconds. Applying the operating voltage in small steps of fixed incremental values will definitely reduce the inrush current. By this way, the control system may take a long period before the motor reaches the rated speed. Applying the operating voltage in larger steps of fixed incremental values will reduce the inrush current By this way, the starting current may not be very smooth leading to torque jumps and jerks and this method is not very much acceptable [3]. A number of methodologies for soft starting of the SCIM have been adopted and recorded in the literature
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