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Title: Circulating Current Suppressing Control’s Impact on Arm Inductance Selection for Modular Multilevel Converter

Arm inductor in a modular multilevel converter (MMC) is used to limit the circulating current and dc short circuit fault current. The circulating current in MMC is dominated by second-order harmonic, which can be largely reduced with circulating current suppressing control. By analyzing the mechanism of the circulating current suppressing control, it is found that the circulating current at switching frequency becomes the main harmonic when suppression control is implemented. Unlike the second-order harmonic that circulates only within the three phases, switching frequency harmonic also flows through the dc side and may further cause high-frequency dc voltage harmonic. This article develops the theoretical relationship between the arm inductance and switching frequency circulating current, which can be used to guide the arm inductance selection. The experimental results with a downscaled MMC prototype verify the existence of the switching frequency circulating current and its relationship with arm inductance.
Authors:
ORCiD logo [1] ;  [2] ;  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States). Center for Ultra-Wide-Area Resilient Electric Energy Transmission Networks, Dept. of Electrical Engineering and Computer Science
  2. Univ. of Tennessee, Knoxville, TN (United States). Center for Ultra-Wide-Area Resilient Electric Energy Transmission Networks, Dept. of Electrical Engineering and Computer Science
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
IEEE Journal of Emerging and Selected Topics in Power Electronics
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2168-6777
Publisher:
IEEE
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; Arm inductance selection; circulating current suppression control; modular multilevel converter (MMC)
OSTI Identifier:
1399423

Li, Yalong, Jones, Edward A., and Wang, Fred. Circulating Current Suppressing Control’s Impact on Arm Inductance Selection for Modular Multilevel Converter. United States: N. p., Web. doi:10.1109/JESTPE.2016.2617865.
Li, Yalong, Jones, Edward A., & Wang, Fred. Circulating Current Suppressing Control’s Impact on Arm Inductance Selection for Modular Multilevel Converter. United States. doi:10.1109/JESTPE.2016.2617865.
Li, Yalong, Jones, Edward A., and Wang, Fred. 2016. "Circulating Current Suppressing Control’s Impact on Arm Inductance Selection for Modular Multilevel Converter". United States. doi:10.1109/JESTPE.2016.2617865. https://www.osti.gov/servlets/purl/1399423.
@article{osti_1399423,
title = {Circulating Current Suppressing Control’s Impact on Arm Inductance Selection for Modular Multilevel Converter},
author = {Li, Yalong and Jones, Edward A. and Wang, Fred},
abstractNote = {Arm inductor in a modular multilevel converter (MMC) is used to limit the circulating current and dc short circuit fault current. The circulating current in MMC is dominated by second-order harmonic, which can be largely reduced with circulating current suppressing control. By analyzing the mechanism of the circulating current suppressing control, it is found that the circulating current at switching frequency becomes the main harmonic when suppression control is implemented. Unlike the second-order harmonic that circulates only within the three phases, switching frequency harmonic also flows through the dc side and may further cause high-frequency dc voltage harmonic. This article develops the theoretical relationship between the arm inductance and switching frequency circulating current, which can be used to guide the arm inductance selection. The experimental results with a downscaled MMC prototype verify the existence of the switching frequency circulating current and its relationship with arm inductance.},
doi = {10.1109/JESTPE.2016.2617865},
journal = {IEEE Journal of Emerging and Selected Topics in Power Electronics},
number = 1,
volume = 5,
place = {United States},
year = {2016},
month = {10}
}