Title :
The problems of voltage notch phenomena in power AC/DC converters
Author :
Ghandehari, R. ; Shoulaie, A. ; Habibinia, D.
Author_Institution :
Iran Univ. of Sci. & Technol., Tehran
Abstract :
In this paper, voltage notch have been analyzed based on theoretical equations at during commutation time of a AC/DC converter. Depth of voltage notch in the converter busbar, depend on several parameters: feeder system impedances (Xs), converter impedance that placed between feeder and converter (Xt) and fire angle of controllable converters (Figure 1). By the way, characteristics variation of notch depth and wide according to system impedances and DC current of converter load, are presented. Main matter of this paper, discuss about oscillation frequency of converter voltages during commutation time. These frequencies depend on system impedances size (Xs+Xt), capacitor banks in network and capacitors size of snubber circuits. In final conclusion experimental results that obtained from a controllable AC/DC converter have been compared with simulation and theoretical results.
Keywords :
AC-DC power convertors; busbars; channel bank filters; commutation; DC current; capacitor banks; commutation time; converter busbar; converter impedance; feeder system impedances; oscillation frequency; power AC-DC converters; voltage notch phenomena; Capacitors; Circuits; Control systems; DC-DC power converters; Equations; Fires; Frequency conversion; Impedance; Snubbers; Voltage control; AC/DC Converter; Commutation Time; Inter Harmonics; Notch Depth; Voltage Notch;
Conference_Titel :
Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International
Conference_Location :
Brighton
Print_ISBN :
978-1-905593-36-1
Electronic_ISBN :
978-1-905593-34-7
DOI :
10.1109/UPEC.2007.4469084