A New Carrier Phase-Shift Modulation Based on Switching the Displacement Angle

Yugang Chen, Shuxiang Song (), Zhixian Liao (), Dan Luo, Dong Lin and Duqu Wei
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Yugang Chen: Faculty of Electronic Engineering, Guangxi Normal University, Guilin 541000, China
Shuxiang Song: Faculty of Electronic Engineering, Guangxi Normal University, Guilin 541000, China
Zhixian Liao: Faculty of Electronic Engineering, Guangxi Normal University, Guilin 541000, China
Dan Luo: Institute of Technology, Guilin University, Guilin 541000, China
Dong Lin: Faculty of Electronic Engineering, Guangxi Normal University, Guilin 541000, China
Duqu Wei: Faculty of Electronic Engineering, Guangxi Normal University, Guilin 541000, China

Energies, 2022, vol. 15, issue 21, 1-14

Abstract: In this paper, a new carrier phase-shift (CPS) modulation method based on switching the displacement angle (SDA) is proposed to compromise the harmonic content of the output voltage and the circulating current. It can be used in medium- and low-voltage applications where the AC-side voltage and DC-side current of the modular multilevel converter (MMC) are required to have low harmonic content simultaneously. In this proposed SDA-based CPS modulation, the carrier displacement angle of the MMC with N submodules in each arm is periodically switched between the values of 0 and π/ N degrees, so that the harmonic content of the output voltage and the harmonic content of the circulating current will not be in extreme conditions, which occurs when the displacement angle is set to 0 or π/ N degrees. The effectiveness of this method has been verified by simulation and experimental results.

Keywords: modular multilevel converter (MMC); carrier phase-shift (CPS) modulation; output voltage harmonic content; circulating current harmonic content (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: 2022
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