Title :
Multi-cell topologies for three-phase systems operating under unbalanced AC mains and asymmetrical loads
Author :
Baier, Carlos R. ; Espinoza, José R. ; Morán, Luis A. ; Guzmán, Johan I. ; Muñoz, Javier A.
Author_Institution :
Dept. of Electr. Eng., Concepcion Univ., Concepcion
Abstract :
This paper shows two alternatives of a multi-cell converter composed of 3N cells per phase and a multi-pulse power transformer. Both achieve high power quality waveforms in three-phase applications even in the presence of unbalanced AC mains. This is due to the controlled DC link voltage loop. However, under asymmetrical loads just one configuration achieves high performance AC supply currents. The paper reviews both alternatives that use an hysterisis-based DC link voltage control in order to keep an overall unitary displacement power factor. Finally, both configurations are compared by means of simulation where unbalance and distortion indexes are computed.
Keywords :
power convertors; power factor; power transformers; voltage control; DC link voltage loop control; asymmetrical load; multicell converter topology; multipulse power transformer; power quality waveform; three-phase system; unitary displacement power factor; Assembly; Computational modeling; Current supplies; Displacement control; Power quality; Power transformers; Reactive power; Topology; Uninterruptible power systems; Voltage control;
Conference_Titel :
Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-1767-4
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2008.4758486