Zero-sequence Current Suppressing Strategy for Dual Three-phase Permanent Magnet Synchronous Machines Connected with Single Neutral Point
Authors：Zongwang Li; Yuxuan Du; Jinghua Ji; Tao Tao; Wenxiang ZhaoDOI: 10.30941/CESTEMS.2022.00058
https://ieeexplore.ieee.org/document/10004917
双三相永磁同步机绕组连接成单个中性点时具有更好的容错性能，但为零序电流提供了回路。本文提出了新型空间矢量脉宽调制（SVPWM）策略抑制零序电流。在一个开关周期内选择五个矢量作为基本电压矢量。在合成基波平面参考电压的同时考虑了谐波平面和零序平面的电压矢量合成。为了抑制零序电流，引入PI控制器生成参考的零序电压来补偿三次谐波反电动势。采用了锯齿载波调制策略来生成非对称PWM信号。通过所提出的方法，零序电流幅值得到了显着降低。仿真和实验结果验证了所提出调制策略的有效性。
图１单中性点连接双三相永磁电机拓扑图
图2给出了系统的控制框图，首先由电流传感器经计算得到零序电流幅值，再由PI控制器产生参考的零序电压送至五矢量SVPWM调制产生相应的PWM波形驱动逆变器控制电机。
图２控制框图
图３双三相永磁电机实验平台
图３是双三相永磁电机实验平台。图４给出了传统四矢量SVPWM和所提出的五矢量SVPWM的实验结果，可以看出相比四矢量SVPWM，所提出的五矢量SVPWM相电流波形更加正弦，总谐波畸变率也明显下降。可以看出零序电流幅值也大幅下降了。
图４ 实验结果
论文针对双三相永磁电机在单个中性点连接时存在的零序电流问题，提出了三平面的五矢量空间矢量脉宽调制方法。该方法在传统双平面空间矢量的基础上，进一步考虑了零序平面的电压矢量的合成。次外，在传统四维电流环的基础上引入了零序电流闭环控制策略。与所提五矢量SVPWM调制策略相结合补偿了反电动势中的三次谐波。降低了相电流中的三次谐波含量，减小了三次谐波对电机造成的损耗和转矩脉动等影响。
引用本文
Z. Li, Y. Du, J. Ji, T. Tao and W. Zhao, "Zero-sequence Current Suppressing Strategy for Dual Three-phase Permanent Magnet Synchronous Machines Connected with Single Neutral Point," in CES Transactions on Electrical Machines and Systems, vol. 6, no. 4, pp. 465-472, December 2022, doi: 10.30941/CESTEMS.2022.00058.
本文作者
Zongwang Li received the B.Sc. degree in East China Jiaotong University, Nanchang, China, in 2020. He is currently working toward the M.Sc. degree in electrical engineering at Jiangsu University, Zhenjiang, China.
His research interests include open-end winding topology, and control of multiphase permanent magnet machines.
Yuxuan Du received the B.Sc. degree in electrical engineering from Jiangsu University, Zhenjiang, China, in 2017. He is currently working toward the Ph.D. degree in electrical engineering at Jiangsu University, Zhenjiang, China.
His research interests include open-end winding topology, control of multiphase permanent magnet machines, and design of high-performance motor driver system.
Jinghua Ji received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from Jiangsu University, Zhenjiang, China, in 2000, 2003, and 2009 respectively.
Since 2000, she has been with the School of Electrical and Information Engineering, Jiangsu University, where she is currently a Professor in Electrical Engineering. From 2013 to 2014, she was a Visiting Scholar with the Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, U.K. Her areas of interest include motor design and electromagnetic field computation. She has authored and co-authored over 100 technical papers in these areas.
Tao Tao received the B.Sc. degree in electrical engineering from Nanjing Agricultural University, Nanjing, China, in 2009, and the Ph.D. degrees from Jiangsu University, Zhenjiang, China, in 2020, all in electrical engineering.
He has been with Jiangsu University since 2021, where he is currently a Lecturer in the School of Electrical Information Engineering. His research interests include control of multi-phase permanent-magnet machines.
Wenxiang Zhao (M’08-SM’14) received the B.Sc. and M.Sc. degrees from Jiangsu University, Zhenjiang, China, in 1999 and 2003, respectively, and the Ph.D. degree from Southeast University, Nanjing, China, in 2010, all in electrical engineering. He has been with Jiangsu University since 2003, where he is currently a Professor with the School of Electrical Information Engineering.
From 2008 to 2009, he was a Research Assistant with the Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong. From 2013 to 2014, he was a Visiting Professor with the Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, U.K. His current research interests include electric machine design, modeling, fault analysis, and intelligent control. He is the author or co-author of more than 150 papers published in various IEEE TRANSACTIONS.
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