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High voltage high power DC/DC modular multilevel converter for offshore windfarm DC collection point

Lookup NU author(s): He Liu Liu, Dr Mohamed Dahidah, Dr Matthew Armstrong


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© 2016, Institution of Engineering and Technology. All rights reserved.This paper presents a new high voltage high power DC/DC converter suitable for off-shore windfarm application. The proposed converter functions as a DC collection point and boosts the wind generators' voltages to facilitate the employment of high voltage direct current (HVDC) transmission lines. The proposed converter utilizes the modular multilevel converter (MMC) structure and combined converter linked by the medium frequency transformer, which leads to lower voltage and current stresses of diode bridge rectifier compared to the conventional DC/DC converters while using relatively smaller transformer. This topology features modularity, which significantly improves system's reliability and implementation. A new control method is also derived for the proposed converter and the effectiveness of the system is demonstrated with various operating conditions.

Publication metadata

Author(s): Liu H, Dahidah M, Armstrong M, Naayagi RT

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 8th International Conference on Power Electronics, Machine and Drives

Year of Conference: 2016

Online publication date: 10/11/2016

Acceptance date: 02/04/2016

Publisher: Institution of Engineering and Technology


DOI: 10.1049/cp.2016.0371