Modeling and Compensation for Dead-Time Effect in High Power IGBT/IGCT Converters with SHE-PWM Modulation

Jingling Cheng, Dongdong Chen and Guozhu Chen
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Jingling Cheng: Department of Electrical Engineering, Zhejiang University, No.38 Zheda Road, Xihu District, Hangzhou 310027, China
Dongdong Chen: School of Electronic and Electrical Engineering, Minnan University of Science and Technology, No.1 Longjing Road, Shishi, Quanzhou 362700, China
Guozhu Chen: Department of Electrical Engineering, Zhejiang University, No.38 Zheda Road, Xihu District, Hangzhou 310027, China

Energies, 2020, vol. 13, issue 17, 1-20

Abstract: Research on applying selective harmonic elimination pulse width modulation (SHE-PWM) to high power converters has drawn tremendous interest, due to the advantages of low switching frequency and high output harmonic performance. In the fields of high power converters such as variable speed traction motor drives and static synchronous compensators (STATCOM), the adoption of high voltage but slow speed semiconductor devices, i.e., IGBT/IGCT, results in a longer dead time of several microseconds, which leads to a motor vibration in the former case or the distortion of grid current in the latter case. This paper analyzes in detail the mechanism of the dead-time effect on 3-level SHE-PWM with different operating conditions considered. For the first time, a general mathematical model describing the relationship between the dead time and harmonic distribution of SHE-PWM wave is established. Based on which an open-loop compensation method by inserting a margin time into the effective switching angles is proposed. Furthermore, a closed-loop controller that implements online adaptive adjustment of the margin time is designed in case of a variable frequency application. The effectiveness of the proposed method in different scenarios is verified through simulation results.

Keywords: selective harmonic elimination; high power converters; dead-time effect; closed-loop compensation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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