Title :
Harmonic analysis of the DC capacitor voltage in modular multilevel converter based STATCOM
Author :
Yang, Xiaofeng ; Li, Jianghong ; Wang, Xiaopeng ; Fan, Wenbao ; Zheng, Trillion Q.
Author_Institution :
Sch. of Electr. Eng., Beijing Jiaotong Univ., Beijing, China
Abstract :
The floating dc capacitor voltage of modular multilevel converter based STATCOM (M-STATCOM) contains a large amount of low-order harmonic components, which produce current ripple in leg currents, and then greatly affect the output performance and safe operation of M-STATCOM. However, fewer papers have made explicit harmonic analysis on the floating capacitor voltage of M-STATCOM. Detailed floating capacitor voltage computation has been developed using the switching functions concept. Moreover, a quasi-harmonic elimination technique has been proposed to achieve low-order harmonic elimination of leg currents without any external circuit. When the modified switching function is applied, the output leg currents of M-STATCOM are independent from the voltage fluctuation of floating capacitors. The effectiveness of the proposed quasi-harmonic elimination technique and the feasibility of theoretical analysis were verified by the simulation results and experimental results.
Keywords :
harmonic analysis; power convertors; static VAr compensators; DC capacitor voltage; STATCOM; external circuit; harmonic analysis; leg currents; low-order harmonic components; modified switching function; modular multilevel converter; quasi-harmonic elimination technique; Automatic voltage control; Capacitors; Harmonic analysis; Inductors; Leg; Pulse width modulation; Switches; STATCOM; capacitor voltage; harmonic elimination; leg current; modular multilevel converter; switching function;
Conference_Titel :
Industrial Electronics and Applications (ICIEA), 2011 6th IEEE Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8754-7
Electronic_ISBN :
pending
DOI :
10.1109/ICIEA.2011.5976027