Simplified Predictive Stator Current Phase Angle Control of Induction Motor With a Reference Manipulation Technique

Arash Fereidooni,Cristian Garcia,S Alireza Davari,Jose Rodriguez

doi:10.1109/access.2021.3070790

Abstract

Finite control set model predictive control (FCS-MPC) is a simple method and has an appropriate dynamic response for the drive applications. Applying additional control objects, e.g., the maximum torque per ampere (MTPA), is easy in FCS-MPC because of its characteristics. A direct application of FCS-MPC to MTPA is the predictive direct angle control method. Though this method eased the MTPA process, the good result is highly sensitive to the proper selection of the weighting factor. Furthermore, finding the best phase angle needs a complicated optimization process. In this paper, the application of simplified predictive control is proposed for angle control. By this proposed method, not only the weighting factor is eliminated but also the constraints of the motor are considered in the control strategy. In this way, the phase angle is automatically controlled in the proper value due to the torque while tedious computation is avoided. Therefore, the proposed method is valid in a wide range of operating points while no optimization process is performed due to changes in speed and torque. This proposed method is evaluated by simulations and experiments.

Highlights

Finite control set model predictive control has a lot of progress in different fields, and because of the simplicity and good dynamic response, there is a lot of interest in studying it [1], [1]–[3]
One of these objectives that can be considered in the cost function is the maximum torque per ampere (MTPA) criterion [10]
It is seen that the phase angle for the proposed method is increased to 51◦ because the d-axis component of the flux was limited based on (25) and (26)

Summary

INTRODUCTION

Finite control set model predictive control has a lot of progress in different fields, and because of the simplicity and good dynamic response, there is a lot of interest in studying it [1], [1]–[3]. To overcome the problem of several weighting factors, a cost function with less number of objects was introduced as predictive direct angle control in [10]. Compared to methods in [13]–[15], predictive direct angle control is the most compact combination between MTPA and FCS-MPC In this method, the cost function has two objectives. The phase angle equal to 45◦ is not the proper reference when the electromagnetic torque reaches to the flux limitation borders of the motor These disadvantages are due to the inherent problems of the multi-objective FCS-MPC method. The flux vector must be predicted for all applicable voltage vectors These values are compared to the calculated flux vector reference via a single-objective cost function. There is no need to calculate the optimal flux or optimal phase angle

PREDICTIVE DIRECT ANGLE CONTROL

MATHEMATICS FOR THE PROPOSED METHOD

CONTROL LOOP

RESULTS AND DISCUSSION

CONCLUSION