Title :
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
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 3rd 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; 3rd 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;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE
Conference_Location :
Charlotte, NC
DOI :
10.1109/APEC.2015.7104643
