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

作　　者：Hui Liu Jianan Chen Dong Jiang Hong Li Xuejun Pei Wei Sun 

机构地区：[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

出　　处：《Chinese Journal of Electrical Engineering》2022年第4期39-51,共13页中国电气工程学报（英文）

基　　金：Supported by the National Natural Science Fundation of China(U1866211)。

摘　　要：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.

关 键 词：MMC conducted EMI carrier phase shift uniform distribution 

分 类 号：TN624[电子电信—电路与系统]