Title :
Controller design for a single-phase two-cell multilevel cascade H-bridge converter
Author :
Vazquez, S. ; Leon, J.I. ; Carrasco, J.M. ; Franquelo, L.G. ; Galvan, E. ; Sanchez, J.A. ; Domínguez, E.
Author_Institution :
Escuela Super. de Ing., Univ. of Seville, Seville
fDate :
June 30 2008-July 2 2008
Abstract :
In this paper is studied the single-phase two-cell multilevel cascade H-bridge power converter connected to the grid, acting as a synchronous rectifier. The power exchange process between the cells of the converter and the grid is analyzed. Based on this analysis and on the power converter model the stages of the controller design process are shown. A new controller for the cascade power converter is proposed, achieving the regulation of each DC-Link capacitor voltage towards its reference. The proposed controller includes a repetitive scheme in the current tracking loop, providing low current harmonic content and almost unity power factor. Simulation results have been carried out in a 10 kVA single-phase two-cell multilevel cascade H-bridge power converter model to illustrate the good performance of the proposed controller.
Keywords :
bridge circuits; cascade networks; control system synthesis; harmonic analysis; power capacitors; power convertors; power factor; power grids; rectifying circuits; DC-Link capacitor voltage; apparent power 10 kVA; cascade power converter; controller design; grid connection; harmonic contents; power exchange process; single-phase two-cell multilevel cascade H-bridge converter; synchronous rectifier; unity power factor; Capacitors; Control systems; Equations; Power markets; Process control; Process design; Rectifiers; Topology; Tracking loops; Voltage control; Multilevel converter; non-linear control; power quality;
Conference_Titel :
Industrial Electronics, 2008. ISIE 2008. IEEE International Symposium on
Conference_Location :
Cambridge
Print_ISBN :
978-1-4244-1665-3
Electronic_ISBN :
978-1-4244-1666-0
DOI :
10.1109/ISIE.2008.4677116
