Eliminating the influence of capacitor voltage ripple on current control for grid-connected modular multilevel converter

Author

Deliang Wu ; Li Peng

Author_Institution

Sch. of Electr. & Electron. Eng.., Huazhong Univ. of Sci. & Technol., Wuhan, China

fYear

2015

fDate

15-19 March 2015

Firstpage

2128

Lastpage

2132

Abstract

The capacitor voltage in modular multilevel converter contains multiple low order harmonics which will induce harmonics in the output voltage and/or current through the modulation process. Harmonics generated by a grid-connected modular multilevel converter with direct modulation and output current control is analyzed. Proportional-resonant controller tuned at the 3^rd harmonic frequency is used for eliminating the influence of the capacitor voltage ripple on the output current control. The analysis is verified by simulation results.

Keywords

electric current control; power capacitors; power convertors; power grids; power system control; power system harmonics; voltage control; 3^rd harmonic frequency; capacitor voltage ripple elimination; grid-connected modular multilevel converter; harmonics generation; multiple low order harmonics; output current control; proportional-resonant controller; Capacitance; Capacitors; Converters; Current control; Frequency control; Harmonic analysis; Voltage control; capacitor voltage ripple; current control; harmonics; modular multilevel converter;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE

Conference_Location

Charlotte, NC

Type

conf

DOI

10.1109/APEC.2015.7104643

Filename

7104643