Minimization of torque ripple in switched reluctance motor based on MPC and TSF

Abstract

In this paper, a novel control method based on model predictive control (MPC) and torque sharing function (TSF) is addressed to minimize the torque ripple of switched reluctance motor (SRM). Firstly, an accurate SRM model is established based on flux‐linkage characteristic curves obtained from the locked rotor test, which can predict the future operation state of the SRM drive system. Secondly, an improved TSF curve is proposed, and genetic algorithm is used to optimize TSF parameters to reduce torque ripple in commutation region. Besides, the MPC is integrated into the TSF control framework to replace the traditional hysteresis controller, and establishes a new TSF‐based model predicted torque control (MPTC) method, which avoids the frequency conversion problem caused by torque or current hysteresis controller. Further, a sector division scheme is addressed to decrease the number of candidate voltage states, whereby the computation of the controller in each sampling period is effectively reduced. Finally, in order to verify the correctness of the MPTC method, it is compared with the traditional direct instantaneous torque control (DITC). Both simulations and experiments on a three‐phase 12/8 pole SRM have confirmed that MPTC scheme can not only decreases torque ripple and stator copper losses, but also has higher efficiency than DITC. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Improved Torque Ripple of Switched Reluctance Motors using Sliding Mode Control for Electric Vehicles

“…Multiple industrial control systems have been used to study the development of SMC approaches [23][24][25][26]. Minimization of torque ripple in switched reluctance motor based on Model Predictive Control (MPC) and Torque Sharing Function (TSF) was conducted in [27]. A novel continuous terminal SMC technique has been devised to ensure that the system states reach the sliding surface in a finite amount of time.…”

Recent Trends in Minimization of Torque Ripples in Switched Reluctance Machine

“…This accelerates the excitation and demagnetization of the commutation region and thus, fast torque tracking is achieved. Reference [70] proposes a direct instantaneous torque control method for SRM based on the optimal angle adaptive TSF. Reference [71] uses the dynamic shapeless TSF to improve the system efficiency in SRM torque control.…”

A torque sharing function with online compensation of excitation current control method for torque ripple reduction in electric excitation auxiliary switched reluctance motor drives

“…In addition, the higher the speed and the shorter the commutation time, the greater the torque ripple. Therefore, the TSF control is more suitable for low and medium speed SRMs [22, 23].…”

“…However, the harmonic current will increase the copper loss and the system efficiency will also be reduced. Some references also proposed to use TSF control to reduce the torque ripple [20,21]. This method does not need to adjust the function according to the number of stator and rotor poles, nor does it generate negative torque which reduces the efficiency of the system.…”