DESIGN OF ENERGY OPTIMIZATION CONTROL MODEL FOR THREE PHASE INDUCTION MOTOR

Abstract

There is usually an imbalance between energy supplied and the amount of energy needed by the ever growing population of the world. Induction motors which is an energy consuming machines is highly used in many industries due to their low cost and low maintenance cost. The influence of these motors (in terms of energy consumption) in energy-intensive industries is significant with respect to total input cost. This work focusedon designing an energy optimization control model for three phase induction motor using the classical optimal controller technique. This was achieved by minimizing the stator current to the least possible value by optimizing the energy drawn by the induction motor for a given torque. The stator voltage values of the induction motor were studied by varying the modulation index (M_a) using the principle of constant flux. The classical optimal control system which uses information on the torque of the motor was used to generate the appropriate voltage amplitude that minimizes the induction motor energy consumption. The classical optimal current controller models were configured for a set of experimental data using the information generated for the approximate minimum stator current value according to fitness functions. The models were implemented using MATLAB/Simulink toolbox and were validated by simulation using a typical three-phase induction motor of 4000W, 400V at a nominal frequency of 50Hz. From the result, it was observed that, the energies drawn by the induction motorwhen using the optimal controller model were highly minimized when compared to the open-loop method. This work has showed that classical control system can be used to minimize the energy consumption of an induction motor to a least possible value for a given output torque.