GWOPID-MRAS based Speed Estimation and Speed Control of Sensorless Induction Motors

Abstract

Sensorless AC motor drives have grown in popularity recently in a variety of applications, from industrial to domestic electrical equipment. FOC and DTC are popular control methodologies in contemporary alternating current (AC) structures. They can achieve good performance for AC motor drives by creating a decupled flux and torque control. However, both have limitations and drawbacks, such as the vector control's dependence on machine parameters and DTC's high flux and torque ripples. This paper proposes a new control method, in which the speed of an induction motor is controlled by Grey Wolf Optimizer (GWO) based PID controller. This method utilizes both FOC, DTC and MRAS observer. The GWOPID controller receives the inputs from MRAS observer, the parameters of PID controller are optimized using GWO algorithm by minimizing the speed deviations of an Induction Motor (IM). The proposed method is implemented in MATLAB/Simulink environment and the performance is compared with IFOC speed control method. Findings demonstrated that the proposed method is effectively reducing the speed deviations as compared with IFOC method under different load conditions.