Hybrid Unidirectional MMC-Based Rectifier

Vinicius Bernardi Fuerback, Gean Jacques Maia De Sousa, Marcelo Lobo Heldwein

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


More-electric ships (MESs) and subsea oil processing electric power systems are typically fed by synchronous generators. These are primarily driven by gas turbines in the case of OG or diesel engines in MESs. In neither of these applications the generators should experience regenerative operation, i.e., they do not operate under reversed power flow. Medium voltage dc unidirectional rectifiers are well suited and provide natural protection against power flow reversals. Thus, a hybrid rectifier concept that is based on line commutated diodes to transfer a large portion of electric power allied with the redundancy and higher operating frequency of modular multilevel converter (MMC) submodules (SMs) is proposed. The hybrid rectifier operates the MMC SMs to synthesize waveforms that are ideally composed of triplen harmonics. Therefore, the frequency of the power oscillations at the capacitors are shifted to frequencies higher than those of a conventional MMC. The overall required capacitance is consequently reduced. Furthermore, a much lower number of SMs is required when compared to a conventional three-phase MMC. These characteristics are welcome in the cited applications. This work discusses how to operate and control the proposed system.

Original languageEnglish
Title of host publication2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538682579
StatePublished - 2 Jul 2018
Externally publishedYes
Event4th IEEE Southern Power Electronics Conference, SPEC 2018 - Singapore, Singapore
Duration: 10 Dec 201813 Dec 2018

Publication series

Name2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018


Conference4th IEEE Southern Power Electronics Conference, SPEC 2018


  • Unidirectional rectifier
  • medium voltage direct current
  • modular multilevel converters
  • power factor correction


Dive into the research topics of 'Hybrid Unidirectional MMC-Based Rectifier'. Together they form a unique fingerprint.

Cite this