A Novel Model Predictive Direct Torque Control Method for Improving Steady-State Performance of the Synchronous Reluctance Motor

Yuanzhe Zhao,Guobin Lin,Linjie Ren,Zhiming Liao

doi:10.3390/en14082256

Yuanzhe Zhao, Guobin Lin + Show 2 more

Open Access

https://doi.org/10.3390/en14082256

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Abstract

Due to the particularity of the synchronous reluctance motor (SynRM) structure, a novel high-performance model predictive torque control (MPTC) method was proposed to reduce the high torque ripple and improve the performance and efficiency of the motor. First, the precise parameters of the SynRM reflecting the magnetic saturation characteristics were calculated using finite element analysis (FEA) data, and the torque and flux linkage maximum torque per ampere (MTPA) trajectory was derived by considering the saturation characteristics. Then, an MPTC model of a SynRM with duty cycle control was established, the MTPA trajectory stored in a look-up table was introduced into the control model, and the duration of the active voltage vector in one control cycle was calculated by evaluating the torque error. Finally, an experimental platform based on a SynRM prototype was built, and various performance comparison experiments were carried out for the proposed MPTC method. The experimental results show that the proposed method could reduce the torque ripple of the motor, the performance of the motor was significantly improved under various working conditions, and its correctness and effectiveness were verified.

Highlights

The synchronous reluctance motor (SynRM) has received extensive attention due to its advantages of having a low cost, ruggedness, high reliability, high efficiency, and good torque performance
The contributions of this article are as follows: the duty cycle control method was introduced in model predictive torque control (MPTC) for a SynRM; an accurate MPTC model was established based on the parameters reflecting the magnetic saturation effect obtained using finite element analysis (FEA) data of the motor; the duration of the active vector was calculated by evaluating the torque error, thereby reducing the torque and flux linkage ripples; the torque–flux maximum torque per ampere (MTPA) trajectory was derived by considering the saturation characteristics and stored in a look-up table (LUT) for online tracking to generate the accurate flux linkage commands required by MPTC
To improve the steady-state performance of a SynRM, this study introduced duty cycle

Summary

Introduction

The synchronous reluctance motor (SynRM) has received extensive attention due to its advantages of having a low cost, ruggedness, high reliability, high efficiency, and good torque performance. Due to the absence of expensive rare-earth magnets, the SynRM is not sensitive to the operating temperature, and its cost is lower than that of permanent magnet synchronous motors (PMSMs) [4,5]. The torque and flux linkage ripples generated by the traditional DTC method are large, which causes mechanical vibrations and noise and reduces the service life of the motor and load. An effective method for reducing the torque ripple is to optimize the control algorithm of the motor drive system

Methods

Results

Conclusion