Periodic Variation in the Effect of Switching Frequency on the Harmonics of Power Electronic Converters*

doi:10.23919/CJEE.2020.000017

Chinese Journal of Electrical Engineering ›› 2020, Vol. 6 ›› Issue (3): 35-45.doi: 10.23919/CJEE.2020.000017

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Periodic Variation in the Effect of Switching Frequency on the Harmonics of Power Electronic Converters^*

Qiao Li¹, Jianan Chen², Dong Jiang^2,*

1. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;
2. State Key Laboratory of Advanced Electromagnets Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2020-05-20 Revised:2020-08-03 Accepted:2020-08-13 Published:2020-10-14
Contact: * E-mail: jiangd@hust.edu.cn
About author:Qiao Li received the B.S. and the Ph.D. degrees from the School of Electrical and Electronic Engineering, Huazhong University of Science and Technology (HUST), Wuhan, China, in 2015 and 2020, respectively. He is currently an assistant professor with Hunan University, Changsha, China. His research interests include pulse width modulation strategy and EMI/EMC in power converters.
Jianan Chen (S'17) was born in Nantong, Jiangsu Province, China, in 1992. He received the B.E. degree in building electricity and intelligence from the Nanjing University of Technology, Nanjing, China, in 2015. He received the M.S. degree in electrical engineering from the Huazhong University of Science and Technology, Wuhan, China, in 2018. He is currently working toward the Ph.D. degree in electrical engineering in the Huazhong University of Science and Technology. His major research interests include electromagnetic interference of power electronic system and multilevel converters.
Dong Jiang (S'05-M'12-SM'16) received the B.S. and M.S. degrees in electrical engineering from Tsinghua University, Beijing, China, in 2005 and 2007, respectively. He began his Ph.D. study in the Center for Power Electronics Systems (CPES) in Virginia Tech in 2007 and transferred to the University of Tennessee with his advisor in 2010. He received the Ph.D. degree in power electronics and motor drives from the University of Tennessee in December 2011. He was with United Technologies Research Center (UTRC) in Connecticut as a senior research scientist/engineer 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 major research area is power electronics and motor drives. He has more than 100 published IEEE journal and conference papers in this area. He was the recipient of five best-paper awards in IEEE conferences. He is an associate editor of IEEE Transactions on Industry Applications and Chinese Journal of Electrical Engineering.
Supported by:
*State Grid of China under Project SGTYHT/16-JS-198

Abstract

Abstract: Switching frequency is an important factor in the performance control of power electronic converters. It can help optimize switching losses, switching ripples and electromagnetic interference, especially for newly developed high-switching-frequency silicon carbide converters. Periodic variation in the switching-frequency methods has been developed for this purpose, especially the model-predictive variable switching-frequency pulse width modulation (VSFPWM) method. The effect of periodic switching-frequency variation on the harmonics of a converter using double Fourier analysis and simulations are investigated. This work verifies that the switching harmonics can be reduced by periodic variation in the switching frequency, and the low-frequency (baseband) harmonics only incur a slight change. The analysis provides a theoretical foundation for the application of VSFPWM in power electronic converters.

Key words: Switching frequency, PWM, harmonics, EMI

Qiao Li, Jianan Chen, Dong Jiang. Periodic Variation in the Effect of Switching Frequency on the Harmonics of Power Electronic Converters^*[J]. Chinese Journal of Electrical Engineering, 2020, 6(3): 35-45.

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Periodic Variation in the Effect of Switching Frequency on the Harmonics of Power Electronic Converters^*

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