DC/DC Converters Based on Hybrid MMC for HVDC Grid Interconnection

Author

Rong Zeng ; Lie Xu ; Liangzhong Yao

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Strathclyde, Glasgow, UK

fYear

2015

fDate

10-12 Feb. 2015

Firstpage

1

Lastpage

6

Abstract

This paper presents a multi-terminal high-power DC/DC converter configuration based on hybrid MMC topology with fault blocking capability for interconnecting HVDC systems. Its main functions include bidirectional power flow, step-up and step-down operation and fault isolation equivalent to a DC circuit breaker. By contrast to the conventional MMC based DC/DC converter, the proposed DC/DC converter with hybrid MMC configuration has the advantage of being able to block the DC/DC converter terminal connecting to faulty DC grid section, while continue operating the other terminals connected to healthy DC grid sections. The proposed DC/DC converter operation is analyzed and its control is described. Simulation results using Matlab/Simulink are presented to demonstrate the robust performance during dc fault conditions.

Keywords

DC-DC power convertors; HVDC power transmission; circuit breakers; power grids; power system interconnection; power transmission faults; DC circuit breaker; DC-DC converter terminal; HVDC grid interconnection; Matlab; Simulink; bidirectional power flow; fault blocking capability; fault isolation; faulty DC grid section; healthy DC grid sections; hybrid MMC topology; modular multilevel converter; multiterminal high-power DC-DC converter configuration; step-down operation; step-up operation; DC/DC converter; HVDC interconnection; average modelling; dc fault blocking; modular multilevel converter;

fLanguage

English

Publisher

iet

Conference_Titel

AC and DC Power Transmission, 11th IET International Conference on

Conference_Location

Birmingham

Print_ISBN

978-1-84919-982-7

Type

conf

DOI

10.1049/cp.2015.0090

Filename

7140572