Title :
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
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;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6953657
