A High-Performance Indirect Torque Control Strategy for Switched Reluctance Motor Drives

Cunhe Li,Jian Liu,Dunxin Bian,Cunshan Zhang,Georgios I Giannopoulos

doi:10.1155/2021/6618539

Abstract

This paper proposes a high-performance indirect control scheme for torque ripple minimization in the switched reluctance motor (SRM) drive system. Firstly, based on the nonlinear torque-angle characteristic of SRM, a novel torque sharing function is developed to obtain the optimal current profiles such that the torque ripple is minimized with reduced copper losses. Secondly, in order to track current accurately and indirectly achieve high-performance torque control, a robust current controller is derived through the Lyapunov stability theory. The proposed robust current controller not only considers the motor parameter modeling errors but also realizes the fixed frequency current control by introducing the pulse width modulation method. Further, a disturbance-observer-based speed controller is derived to regulate the motor speed accurately, and the load torque is considered an unknown disturbance. The simulations and experiments on a 1.5 kW SRM prototype are carried out to demonstrate the effectiveness of the proposed high-performance indirect torque control strategy. Results verify the superiority of the proposed strategy with respect to the torque ripple suppression, system efficiency, and antidisturbance.

Highlights

Switched reluctance motor (SRM) has recently attracted much attention from the industrial and academic communities due to its own advantages, such as simple and strong structures, high reliability, wide speed range, no need for rare Earth permanent magnetic materials, and low manufacturing cost [1,2,3,4]
In order to simultaneously solve the aforementioned problems, a high-performance indirect torque control (HPITC) strategy for SRM drive is proposed in this paper
In order to demonstrate the effectiveness of the HPITC method, the SRM drive system is simulated under different operating conditions using the Matlab/Simulink software

Summary

Introduction

Switched reluctance motor (SRM) has recently attracted much attention from the industrial and academic communities due to its own advantages, such as simple and strong structures, high reliability, wide speed range, no need for rare Earth permanent magnetic materials, and low manufacturing cost [1,2,3,4]. In [16], the effects of different TSFs such as linear, cosine, quadratic, and exponential to reduce the torque ripple of SRMs are compared and evaluated. An offline optimization method of TSF is used in [17] to minimize torque ripple, and its objective function combines both the phase current and the rate of change of flux-linkage. When hysteresis current controller is used in the SRM drive system, the switching frequency of power converter is uncontrollable, which will produce some unpredictable acoustic noise. In order to simultaneously solve the aforementioned problems, a high-performance indirect torque control (HPITC) strategy for SRM drive is proposed in this paper. A novel speed controller associated with a load torque observer has been developed to achieve accurate speed regulation and improve the antidisturbance performance of the SRM drive system. Due to the comprehensive improvement of the HPITC strategy, the proposed method offers the feasibility of effectively reducing the torque ripple, improving system efficiency, and enhancing antidisturbance ability. e effectiveness of the HPITC method is demonstrated by simulations and experiments

SRM Model

Simulation Results

Experimental Results

Conclusion