Title :
Optimal Voltage-Balancing Compensator in the Modulation of a Neutral-Point-Clamped Converter
Author :
Zaragoza, Jordi ; Pou, Josep ; Ceballos, Salvador ; Robles, Eider ; Jaen, Carles
Author_Institution :
Tech. Univ. of Catalonia, Catalonia
Abstract :
This paper presents an optimal voltage-balancing compensator for a particular type of modulation technique applied to the neutral-point-clamped converter. This modulation technique is able to completely eliminate low- frequency voltage oscillations in the neutral point. However, its dynamic for balancing voltages on the dc-link capacitors is slow. The proposed compensator generates an optimal offset for the modulation signals that improves significantly the voltage balancing issue for any operation condition of the converter. Furthermore, this strategy does not increase switching frequencies of the devices. The algorithm is tested and verified by simulation and experiment.
Keywords :
compensation; optimal control; power capacitors; switching convertors; voltage control; carrier based modulation; dc-link capacitors; neutral-point-clamped converter; optimal voltage balancing compensator; voltage oscillations; Capacitors; Power engineering and energy; Robots; Signal generators; Switching frequency; Testing; Topology; Virtual colonoscopy; Voltage; Wind energy generation; Carrier-based modulation; neutral-point-clamped converter; optimal compensator; three-level converter; voltage balance;
Conference_Titel :
Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on
Conference_Location :
Vigo
Print_ISBN :
978-1-4244-0754-5
Electronic_ISBN :
978-1-4244-0755-2
DOI :
10.1109/ISIE.2007.4374685