A novel DC charging strategy for modular multilevel converter in a HVDC system

Author

Sun Zhandong ; Li Yaohua ; Wang Ping ; Chu Zunfang ; Li Zixin ; Gao Fanqiang ; Xu Fei ; Luo Yongjie

Author_Institution

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

fYear

2014

fDate

Aug. 31 2014-Sept. 3 2014

Firstpage

1

Lastpage

5

Abstract

The pre-charge process is one crucial step of the operating for modular multilevel converters. Improper charging strategy may damage sub-modules due to capacitor voltage unbalance, or cause tripping operation of the whole system due to leg current overflowing. Thus, it is important to analyze the charging strategy and charging current suppressing method before designing the controller of modular multilevel converter. In this work, a novel DC-link charging strategy is proposed. Experiments results have been demonstrated to verify the validity of the proposed strategy.

Keywords

HVDC power convertors; DC charging strategy; HVDC system; capacitor voltage unbalance; charging current suppressing method; leg current overflowing; modular multilevel converter; Capacitors; Converters; Equations; Insulated gate bipolar transistors; Inverters; Modulation; Voltage control; DC Charging Strategy; High Voltage Direct Current (HVDC); Modular Multilevel Converter (MMC);

fLanguage

English

Publisher

ieee

Conference_Titel

Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014 IEEE Conference and Expo

Conference_Location

Beijing

Print_ISBN

978-1-4799-4240-4

Type

conf

DOI

10.1109/ITEC-AP.2014.6940867

Filename

6940867