Energy-based circulating current control of a single-phase hybrid modular multilevel converter

Hongmei Wang, Fa Chen, Liyan Qu, Wei Qiao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a mathematical model for the single-phase hybrid modular multilevel converter (MMC). Based on the model, the DC and fundamental AC components of the circulating current of the single-phase hybrid MMC are analyzed and their expressions are derived for the first time. Based on the analysis, a novel dual-loop circulating current control scheme is proposed for the single-phase hybrid MMC. The proposed control scheme can suppress the low-order harmonics of the circulating current without affecting the output current. Consequently, the total harmonic distortions and peak/root-mean-square values of the arm currents, the current/voltage stresses on the submodules (SMs), and the power loss of the MMC are all reduced. Moreover, the proposed control scheme can effectively balance the energy between the upper and lower arms of the single-phase hybrid MMC. Experimental results on a prototype of the single-phase hybrid MMC with three SMs per arm are provided to validate the effectiveness of the proposed circulating current control scheme.

Original languageEnglish (US)
Title of host publication2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages913-920
Number of pages8
ISBN (Electronic)9781728189499
DOIs
StatePublished - Jun 14 2021
Event36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021 - Virtual, Online, United States
Duration: Jun 14 2021Jun 17 2021

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Country/TerritoryUnited States
CityVirtual, Online
Period6/14/216/17/21

Keywords

  • Circulating current control
  • Hybrid converter
  • Modular multilevel converter (MMC)
  • Single phase

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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