Hybrid modular multilevel converter with reduced three-level cells in hvdc transmission system

Rui Li, Jing Wu, Liangzhong Yao, Yan Li, Barry Williams

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

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Abstract

A hybrid MMC with reduced three-level (TL) cells is proposed. As well as the dc fault blocking capability, the proposed hybrid MMC provides the benefits of: lower conduction losses; fewer diode and switching devices, and; fewer shoot-through modes. Guidelines are developed to determine the required number of three-level cells to block a dc-side fault. It is also demonstrated that a further reduction in the number a three-level cells is possible if a rise in cell current and voltage is acceptable. This reduction is investigated. A lower number of three-level cells reduces losses and capital cost further. The hybrid MMC with the reduced number of three-level cells proves to be the most attractive approach compared with other MMCs and hybrid MMCs. The semiconductor count and conduction loss are 92.1% and 90.3% respectively of that of the MMC based entirely on full-bridge cells, without exposing the semiconductors to significant fault currents and over-voltages. The simulation results demonstrate the feasibility of the proposed hybrid converter.
Original languageEnglish
Title of host publication2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)
PublisherIEEE
ISBN (Electronic)9781509012107
ISBN (Print)9781509012114
DOIs
Publication statusPublished - 22 May 2016
Event8th International Power Electronics and Motion Control Conference-ECCE Asia(IPEMC 2016-ECCE Asia) - Platinum Hanjue Hotel, Hefei, China
Duration: 22 May 201625 May 2016
http://www.ipemc2016.org/index.php

Conference

Conference8th International Power Electronics and Motion Control Conference-ECCE Asia(IPEMC 2016-ECCE Asia)
Country/TerritoryChina
CityHefei
Period22/05/1625/05/16
Internet address

Keywords

  • dc fault blocking
  • HVDC transmission
  • hybrid modular multilevel converter (MMC)
  • fault currents
  • capacitors
  • circuit faults
  • hidden Markov models
  • capacitance
  • stress

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