CJEE

Chinese Journal of Electrical Engineering ›› 2022, Vol. 8 ›› Issue (4): 39-51.doi: 10.23919/CJEE.2022.000037

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Uniform Distribution Spread-spectrum Modulation Strategy for MMC to Reduce Conducted EMI and Switching Loss*

Hui Liu1, Jianan Chen2, Dong Jiang1,*, Hong Li3, Xuejun Pei1, Wei Sun1   

  1. 1. State Key Laboratory of Advanced Electromagnets Engineering and Technology,Huazhong University of Science and Technology, Wuhan 430074, China;
    2. College of Electrical Engineering and Control Science,Nanjing University of Technology, Nanjing 211816, China;
    3. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
  • Received:2022-05-15 Revised:2022-08-22 Accepted:2022-08-30 Online:2022-12-25 Published:2023-01-13
  • Contact: * E-mail: jiangd@hust.edu.cn
  • About author:Hui Liu received his B.S. degree in Electrical Engineering from Hefei University of Technology, Hefei, China, in 2021. He is currently working toward his Ph.D. in Electrical Engineering with the Huazhong University of Science and Technology in Wuhan, China.
    His research interests include multilevel converters and electromagnetic interference of power electronics.
    Jianan Chen was born in Nantong, China, in 1992. He received his B.S. degree in Building Electricity and Intelligence from Nanjing University of Technology, Nanjing, China, in 2015. He received his M.S. and Ph.D. degrees in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 2018 and 2021, respectively.
    He is now working as a Lecturer at Nanjing University of Technology, Nanjing, China. His major research interests include electromagnetic interference of power electronics system and multilevel converters.
    Dong Jiang received his B.S. and M.S. in Electrical Engineering from Tsinghua University, Beijing, China, in 2005 and 2007, respectively. He received his Ph.D. in Power Electronics and Motor Drives in 2011 at the University of Tennessee, Knoxville, TN, USA. He was a Senior Research Scientist/Engineer, at the United Technologies Research Center (UTRC), East Hartford, CT, USA, from January 2012 to July 2015. He has been with the Huazhong University of Science and Technology (HUST), Wuhan, China, as a Professor, since July 2015. His main research interests include power electronics and motor drives, with more than 100 published IEEE journal and conference papers in this area. Dr. Jiang was the recipient of six best paper awards at IEEE conferences. He is an Associate Editor for the IEEE Transactions on Industry Applications and the Chair of IEEE Power Electronics Society Wuhan Chapter.
    Hong Li received her B.Sc. in Electrical Engineering from Taiyuan University of Technology, Taiyuan, China, in 2002, her M.Sc. in Electrical Engineering from South China University of Technology, Guangzhou, China, in 2005; and her Ph.D. in Electrical Engineering from Fernuniversität in Hagen, Germany, in 2009. She is currently a Full Professor at the School of Electrical Engineering, Beijing Jiaotong University, Beijing, China. She has published 1 book, 63 journal papers, and 60 conference papers. She has also authorized 30 patents. Her research interests include nonlinear modeling and its analysis and applications, EMI suppressing methods for power electronic systems, and wide-bandgap power devices and applications. Dr. Li is an Associate Editor of the IEEE Transactions on Industrial Electronics, an Associate Editor of the IEEE Transactions on Power Electronics, an Associate Editor of the Chinese Journal of Electrical Engineering, the Vice Chair of IEEE PELS Beijing Chapter and the Vice Chairman of Electromagnetic Compatibility Specialized Committee in China Power Supply Society.
    Xuejun Pei received his B.S., M.S., and Ph.D. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1998, 2001, and 2004, respectively. He is now a Full Professor at the School of Electrical and Electronics Engineering at Huazhong University of Science and Technology. His research interests include control techniques of power electronic converters, EMI, protection issues, and fault diagnosis in high-power converters. He has published over 20 papers in IEEE Transaction journals and 30 papers in IEEE conferences. He has gained two state and ministry science and technology progress awards. He was awarded the 2010 Delta Visiting Scholar and 2016 Delta Young Scholar. He is the reviewer of IEEE Transactions on power electronics, industrial electronics, industry applications, and IET journals.
    Wei Sun received his B.S. in Electrical Engineering from Beijing Jiaotong University, Beijing, China, in 2009, and his M.S. and Ph.D. in Electrical Engineering from Harbin Institute of Technology, Harbin, in 2012 and 2016, respectively. He has been a Lecturer at Huazhong University of Science and Technology, Wuhan, China, since November 2017. His main fields of interest are AC motor drive and control theory application in power electronics systems.
  • Supported by:
    * National Natural Science Fundation of China (U1866211).

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Abstract: Modular multilevel converters (MMCs) have been widely used owing to their superior performance. However, the rapid switching of power electronics devices causes serious electromagnetic interference (EMI). There are a large number of obvious EMI peaks in the frequency spectrum of the carrier phase-shifted constant-switching-frequency pulse-width modulation (CSFPWM). Spreading the EMI across a wider frequency range can help to reduce the EMI peaks. In this study, we designed a uniform distribution (UD) spread-spectrum modulation technology using the principle of uniform switching frequency distribution and minimum switching loss for MMC. Its feasibility is verified by theoretical derivation and simulation. Then, the effectiveness of UDPWM in reducing the EMI is verified in experiments with a prototype MMC testbed in the lab. Compared with traditional CSFPWM, UDPWM can reduce conducted EMI by 10-20 dB. Also, compared with random PWM (RPWM), UDPWM can improve efficiency and reduce total harmonic distortion (THD) of output voltage and current in MMC.

Key words: MMC, conducted EMI, carrier phase shift, uniform distribution