Online Golden Section Method based Loss Minimization Scheme for Direct Torque Controlled Induction Motor Drive

摘要

Induction motors (IM) drives are extensively used in the industries. However, the efficiency of the induction motor (IM) is poor when operated at the lightly loaded condition. Hence, IM loss optimization is necessary and can be achieved by optimizing the operating flux. This particular paper presents a search control scheme based on the Golden Section method for direct torque control (DTC) of induction motor (IM) drive to minimize the drive's losses. The machine's stator flux level is directly regulated by the proposed scheme thereby reducing the losses and improving the efficiency. The proposed algorithm is comparatively fast and a beforehand knowledge of the minimum number of functional estimations like other methods such as Fibonacci search method is not required. Furthermore, it has faster convergence compared to other search-based method as it requires the least number of functional evaluations to reach the desired precision. The approach is not only easy to implement but also do not require any external hardware for practical implementation. In this context, all the studies are carried out in MATLAB/Simulink.