Efficiency Optimization of Induction Motor by Automatic Voltage Regulator of Synchronous Generator Based on Search-based Method

This article proposes a new method to optimize the efficiency of a 7.5 kW induction motor connected to a synchronous generator. The Synchronous generator is a part of an emergency power system supposed to provide power for the induction motor. In this proposed method, the efficiency of induction motor is optimized by the automatic voltage regulator of synchronous generator under different loads. The centerpiece of automatic voltage regulator is a DC/DC buck converter which feeds excitation winding. Due to improvement of induction motor efficiency, the cost of generation is significantly reduced. In the proposed method, a search-based method is utilized to adjust the output voltage of synchronous generator in order to find the maximum efficiency of induction motor. Furthermore, losses equations are presented which are applied in efficiency calculation. As a result of not using speed sensor, the motor equations are used to estimate the motor slip in each step of search method. Results of the proposed method is presented to verify the method performance using MATLAB/Simulink.