Grid Search Optimization Techniques for the Indirect Vector-Controlled Induction Motor Drives

In this paper, a Grid Search Method (GSM) with a Field Oriented Control (FOC) is presented to determine the optimal Proportional-Integral (PI) controller gain parameters for the speed control of an induction motor. This technique is useful in finding the optimal controller gain (proportional and integral) in a closed loop system. The GSM is used to obtain gains required for the adaptive PI by seeking the optimal local minimum of a squared speed error function. The results show that the GSM is very efficient, and gives stable convergence characteristics. It has a good track record of robustness under load variation, fast dynamic response, and high precision in tracking desired speed. Furthermore, the control system, based on the GSM-PI algorithm in FOC for induction motors, can be readily implemented for occasions of frequent load changing, such as in industrial applications.