Startup strategy of VSC-HVDC system based on modular multilevel converter

Author

Fanqiang Gao ; Zixin Li ; Fei Xu ; Zunfang Chu ; Ping Wang ; Yaohua Li

Author_Institution

Key Lab. of Power Electron. & Electr. Drive, Inst. of Electr. Eng., Beijing, China

fYear

2014

fDate

14-18 Sept. 2014

Firstpage

1946

Lastpage

1952

Abstract

Based on modular multilevel converter (MMC) for high voltage direct current (HVDC) system, the startup strategy is researched. The equivalent charging circuits and physical models for uncontrolled and controlled charging process of MMC-HVDC system are derived and the charging current stresses are analyzed. In traditional methods, series resistors in the arm or in the dc lines are used to limit the surge current when the MMC station unlocked at controlled charge step from dc side. In this paper, new startup method without extra source is proposed. With this method, charging current of MMC from dc side at controlled stage is minimized. Experimental results testify the effectiveness of this strategy.

Keywords

HVDC power convertors; equivalent circuits; MMC system; VSC-HVDC system; charging current stresses; controlled charging process; dc lines; equivalent charging circuits; high voltage direct current system; modular multilevel converter; physical models; series resistors; startup strategy; surge current; uncontrolled charging process; Capacitors; Equivalent circuits; Limiting; Resistors; Stress; Topology; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2014 IEEE

Conference_Location

Pittsburgh, PA

Type

conf

DOI

10.1109/ECCE.2014.6953657

Filename

6953657