Cascaded Model Predictive Control of Six-Phase Permanent Magnet Synchronous Motor with Fault Tolerant Ability

Ling Feng1; Zhaohui Wang2; Jianghua Feng1; Wensheng Songz2

1. CRRC ZhuZhou Institude Co., Ltd., ZhuZhou, China

2. Southwest Jiaotong University, Chengdu, China

L. Feng, Z. Wang, J. Feng and W. Song, "Cascaded Model Predictive Control of Six-Phase Permanent Magnet Synchronous Motor with Fault Tolerant Ability," in CES Transactions on Electrical Machines and Systems, vol. 7, no. 3, pp. 311-319, September 2023, doi: 10.30941/CESTEMS.2023.00033.

摘 要

在大功率电力驱动领域，多相电机具有功率密度高、容错性好、控制灵活等优点。但由于自由度的增加，它们的解耦控制和调制过程比三相电机复杂得多。有限控制集模型预测控制由于不需要调制过程，降低了控制六相电机的难度。本文针对大功率六相永磁同步电动机的最优控制，提出了一种级联模型预测控制策略。首先，通过对六相空间变量的解耦，建立转矩与谐波子空间的电流预测模型。其次，提出了一种具有容错能力的级联代价函数，以消除代价函数中的权重因子。最后，通过理论分析和实验对所提出的策略进行了验证。实验结果表明，该方法在保证系统稳态控制精度和快速动态响应的同时，大大降低了系统的控制复杂度。此外，在断相故障情况下也能很容易地实现容错操作。

Abstract

In the field of high-power electric drives, multiphase motors have the advantages of high power-density, excellent fault tolerance and control flexibility. But their decoupling control and modulation process are much more complicated compared with three-phase motors due to the increased degree of freedom. Finite control set model predictive control can reduce the difficulties of controlling six-phase motors because it does not require modulation process. In this paper, a cascaded model predictive control strategy is proposed for the optimal control of high-power six-phase permanent magnet synchronous motors. Firstly, the current prediction model of torque and harmonic subspaces are established by decoupling the six-phase spatial variables. Secondly, a cascaded cost function with fault-tolerant capability is proposed to eliminate the weighting factor in the cost function. And finally, the proposed strategy is demonstrated through theoretical analysis and experiments. It is validated that the proposed method is able to maintain excellent steady-state control accuracy and fast dynamic response while significantly reduce the control complexity of the system. Besides, it can easily achieve fault-tolerant operation under open-phase fault.

作者信息

Ling Fengwas born in 1991. He received the B.S., M.S and ph.D. degrees in electrical engineering from Shanghai Jiao Tong University, Southwest Jiaotong University, China, in 2014, 2017 and 2022, respectively. He is now a motor control R & D Engineer for CRRC ZhuZhou Institude Co., Ltd.. His research interests include multi-level convertors and model predictive control of traction system.

Zhaohui Wangreceived the M.S. degree in electrical engineering in 2023 from Southwest Jiaotong University, Chengdu, China, where he is currently working toward the Ph.D. degree in electrical engineering. His research interests include modeling, control, and modulation of permanent magnet synchronous motor drives.

Jianghua Fengwas born in Hengyang, Hunan, China, in 1964. He received the B.S. and M.S. degrees in Electrical engineering from the Zhejiang University, Zhejiang, China, in 1989, and the Ph.D. degree in control engineering from Central South University, Changsha, China, in 2008. Since 1989, he has been with the Zhuzhou CRRC Times Electric Co., Ltd., Zhuzhou, where from 2002 to 2004, he was the Director of Technology Center, and from 2005 to 2009, he was the Technical Director of Zhuzhou CRRC Times Electric Co., Ltd., and, currently is the Chief Engineer. His research interests are in power electronics, drive control, and permanent magnet motor system. Prof. Feng was a recipient of the Mao Yisheng prize for science and technology of China, and the honorary title of Contemporary Inventor of China in 2016.

Wensheng Song(Senior Member, IEEE) received the B.S. degree in electronic and information engineering and the Ph.D. degree in electrical engineering from Southwest Jiaotong University, Chengdu, China, in 2006 and 2011, respectively. From September 2009 to September 2010, he was a Visiting Scholar with the Department of Electrical Engineering and Computer Science, University of California at Irvine, Irvine, CA, USA. From July 2015 to December 2015, he was a Visiting Scholar with the University of Alberta, Edmonton, AB, Canada. He is currently a Full Professor with the School of Electrical Engineering, Southwest Jiaotong University. His current research interests include power electronics, motor drives, railway traction drive systems, and multilevel converters.

《中国电工技术学会电机与系统学报（英文）》(CES TEMS)是中国电工技术学会和中国科学院电工研究所共同主办、IEEE PELS学会技术支持的英文学术期刊。期刊发表国内外有关高性能电机系统、电机驱动、电力电子、可再生能源系统、电气化交通等研发及应用领域中原创、前沿学术论文。中国工程院院士马伟明担任主编，IEEE的执委Don Tan博士为国际主编。目前已被EI、Scopus、 Inspec、Google scholar、IEEE Xplore、中国科学引文数据库(CSCD) 核心版、DOAJ、CSTPCD、知网、万方、维普等数据库收录。

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