Controlled transition bridge multilevel converter

G. P. Adam, K. H. Ahmed, D. Holliday, S. J. Finney, G. M. Burt, B. W. Williams

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

4 Citations (Scopus)


This paper presents a controlled transition bridge (CTB) converter that uses a non-trapezoidal amplitude modulation in attempt to reduce filtering requirement in high-voltage direct current (HVDC) transmission systems. To achieved variable output ac voltage (modulation index control) over wide range, as expected during a black-start, cell capacitor voltage balancing of the CTB converter is decoupled from the modulation index and power factor by injecting a 3rd harmonic component into the modulating signal of each phase. This 3rd harmonic extends the region around voltage zeros, where the cell capacitor voltages can be balanced, by ensuring that each limb is alternatively clamped to the positive and negative dc rails, every fundamental period to allow recharge of the cell capacitors from the dc link. The effective of the presented non-trapezoidal modulation method for operation of the CTB converter over full modulation and power factor range is confirmed by simulation, including its scalability to high applications.

Original languageEnglish
Title of host publication2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781509033881
ISBN (Print)9781509033898
Publication statusPublished - 23 Mar 2017
Event5th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2016 - Birmingham, United Kingdom
Duration: 20 Nov 201623 Nov 2016


Conference5th IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2016
Country/TerritoryUnited Kingdom

Bibliographical note

This work was supported by the EPSRC UK Centre for Power Electronics under Grant EP/K035304/1 (Converter Theme Research Programme).


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