Continuous Control Set Model Predictive Control of a Switch Reluctance Drive Using Lookup Tables

Abstract

A problem of the switched reluctance drive is its natural torque pulsations, which are partially solved with finite control set model predictive control strategies. However, the continuous control set model predictive control, required for precise torque stabilization and predictable power converter behavior, needs sufficient computation resources, thus limiting its practical implementation. The proposed model predictive control strategy utilizes offline processing of the magnetization surface of the switched reluctance motor. This helps to obtain precalculated current references for each torque command and rotor angular position in the offline mode. In online mode, the model predictive control strategy implements the current commands using the magnetization surface for fast evaluation of the required voltage command for the power converter. The proposed strategy needs only two lookup table operations requiring very small computation time, making instant execution of the whole control system possible and thereby minimizing the control delay. The proposed solution was examined using a simulation model, which showed precise and rapid torque stabilization below rated speed.

Switched Reluctance Motors and Drive Systems for Electric Vehicle Powertrains: State of the Art Analysis and Future Trends

“…The proposed method offers a reduction of the torque ripple, the elimination of chattering phenomena and lower harmonic distortion of motor currents. In [102], a continuous control set model predictive control of an SRM using lookup tables was proposed. The proposed method has the fixed switching frequency and less computational load.…”

Magnetic Material Modelling of Electrical Machines

“…Another aspect of the machine addressed in this Special Issue was the problem of torque pulsations. In this ambit, A. Anuchin et al proposed [6] a continuous control set model predictive control to control the power converter using pulse-width modulation. The solution requires small computation efforts and operates utilizing the assumption that optimal current reference profiles for each torque reference and angular position can be evaluated offline from the magnetization surface of the electrical machine.…”

Design Optimization of Outer Rotor Toothed Doubly Salient Permanent Magnet Generator Using Symbiotic Organisms Search Algorithm

“…The maximum torque value is 3845.2 Nm, and the minimum torque value is 2930 Nm. The torque ripple factor of the machine is calculated by using Equation (19),…”

“…The recent advances in several fields (e.g., sensors technology, power electronics, materials etc.) help the DSPM machines to obtain performances comparable to those of PM synchronous machines [6,7,17,19]. However, the majority of this type of machines proposed for the wind power application are with the stator and rotor pole number, respectively, 6/4, 8/6, 12/10, 36/24 [20,21]; these machines are efficient when it comes to applications at high and medium speeds, but they become unsuitable at low speed ones, because their volume is directly linked to the value of its sizing torque.…”