Strategies for decoupling internal and external dynamics resulting from inter-arm passive component tolerances in HVDC-MMC

Shuren Wang, Grain Adam, Ahmed Massoud, Derrick Holliday, Barry Williams

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

1 Citation (Scopus)
4 Downloads (Pure)

Abstract

Modular Multilevel Converter (MMC) performance may be adversely affected by passive component tolerances, such as submodule capacitance and arm inductance variations. Depending on control strategies, the differences in equivalent capacitances and/or inductances of the upper and lower arms of one phase-leg can cause unequal power distribution between upper and lower arms. Assuming passive component tolerances ranging between ±10%, this paper presents a comprehensive assessment of the internal/external coupling effects due to the passive component tolerances within one phase-leg, under the control of common MMC balancing methods. A novel control strategy is proposed to suppress the fundamental component that arises in the dc-link current due to such tolerances, and its effectiveness is demonstrated via simulation and experimentation. The investigation shows that voltage-based common and differential mode balancing control provides effective ac offset suppression while the proposed method offers superior performance in terms of dc-link fundamental current ripple suppression.
Original languageEnglish
Title of host publication2019 IEEE Energy Conversion Congress and Exposition
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages209-213
Number of pages5
ISBN (Print)9781728103952
DOIs
Publication statusPublished - 28 Nov 2019

Keywords

  • modular multilevel converter (MMC)
  • internal control
  • voltage and power balance
  • component tolerances

Fingerprint Dive into the research topics of 'Strategies for decoupling internal and external dynamics resulting from inter-arm passive component tolerances in HVDC-MMC'. Together they form a unique fingerprint.

  • Cite this