Finite Set Model Predictive Control of a Dual-Motor Torque Synchronization System Fed by an Indirect Matrix Converter

Shujing Li,Tingna Shi,Zewen Wang,Yan Yan

doi:10.3390/en14051325

Shujing Li, Tingna Shi + Show 2 more

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https://doi.org/10.3390/en14051325

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Journal: Energies	Publication Date: Mar 1, 2021
Citations: 2	License type: CC BY 4.0

Affiliation: Tianjin University, Zhejiang University

Abstract

In the dual-motor torque synchronization system fed by an indirect matrix converter (IMC), a finite set model predictive control (FCS-MPC) strategy based on a standard quadratic cost function was proposed to solve the open-loop problem of the torque synchronization error in a traditional closed-loop control strategy. Through the unified modeling of a dual-motor system, the torque synchronization error as a new state variable was involved in the switching state selection of the inverter stages, and the space vector modulation method was still used in the rectifier stage. At the same time, based on the unified prediction model, the auxiliary diagonal matrix was constructed, and the weight coefficients were solved offline by using the Lyapunov stability theory to ensure the convergence of each error term in the continuous control period. The proposed FCS-MPC strategy not only solves the problem of weight coefficient setting, but also makes it possible for a multi-motor synchronization system to expand the number of motors. The simulation and experimental results verified the effectiveness and feasibility of the control strategy. In addition, the proposed FCS-MPC strategy can ensure good torque tracking performance and synchronization performance of each motor.

Highlights

An indirect matrix converter (IMC) contains an independent rectifier stage and an inverter stage in terms of topology
In view of the limited research on the torque synchronization control strategy of the dual-motor system fed by an IMC at home and abroad, and the open-loop problem of the torque synchronization error in the traditional closed-loop control strategy based on the master-slave structure, this paper considered the combination of the dual-motor system and the finite set model predictive control strategy, which can meet the needs of multi-objective control, and give full play to the advantages of a dual-motor system fed by an IMC in industrial applications
In the FCS-MPC of a dual-motor torque synchronous system fed by an IMC, the cost function is the key to system optimization, in which the weight coefficients regulate the effect of each variable

Summary

Introduction

An indirect matrix converter (IMC) contains an independent rectifier stage and an inverter stage in terms of topology. Different modulation strategies can be applied to modulate each part, respectively. It can realize the zero-current commutation of bidirectional switches, and the control strategy is very flexible [1,2,3]. In heavy-duty industrial applications, such as high-power traction systems, mining shield equipment and ship propulsion systems, due to the large output torque, one load is usually required to be driven by multiple motors, and the output torque of each motor should be balanced. It is of great significance to study the torque synchronization strategy of a dual-motor system fed by an IMC for the safe production of heavy-duty industrial applications [8,9]

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Conclusion