Fault-tolerant operation scheme for modular multilevel converter under arm energy imbalance

Jaesik Kang, Heejin Kim, Kyeon Hur, Hong Ju Jung, Dong Su Lee

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

Abstract

This paper proposes a fault-tolerant operation scheme for modular multilevel converter (MMC) when a sub-module (SM) fault occurs. The MMC is featured with N-level corresponding to the number of SMs activated for an operation. The number of these SMs in the upper and lower arms should be the same, and the energy in each arm should be balanced during the normal operation state. The arm with faulty SMs however, results in the arm energy imbalance between upper and lower arms, and can cause an instability on voltage sourced-converter (VSC) control in the MMC by imbalancing the SM capacitor voltage, interrupting the power transfer. This paper thus first elaborates on the internal dynamics of MMC with faulty SMs analytically, and then develops a practical fault-tolerant operation scheme for non-interruptible power transfer. Rigorous simulation studies using PSCAD/EMTDC and PLECS demonstrate the validity and effectiveness of the proposed scheme. This research should help make the most of the topological redundancy in the MMC for the fail-safe power transfer.

Original languageEnglish
Title of host publication2017 IEEE 12th International Conference on Power Electronics and Drive Systems, PEDS 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages801-807
Number of pages7
ISBN (Electronic)9781509023646
DOIs
Publication statusPublished - 2018 Feb 9
Event12th IEEE International Conference on Power Electronics and Drive Systems, PEDS 2017 - Honolulu, United States
Duration: 2017 Dec 122017 Dec 15

Publication series

NameProceedings of the International Conference on Power Electronics and Drive Systems
Volume2017-December
ISSN (Print)2164-5256
ISSN (Electronic)2164-5264

Other

Other12th IEEE International Conference on Power Electronics and Drive Systems, PEDS 2017
CountryUnited States
CityHonolulu
Period17/12/1217/12/15

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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