Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31005
Title: Low-frequency hopf bifurcation and its effects on stability margin in three-phase PFC power supplies connected to non-ideal power grid
Authors: Huang, M
Tse, CK 
Wong, SC 
Wan, C
Ruan, X
Keywords: Catastrophic bifurcation
grid interaction
Hopf bifurcation
low-frequency instability
three-phase voltage source converter
Issue Date: 2013
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on circuits and systems. I, Regular papers, 2013, v. 60, no. 12, 6605630, p. 3328-3340 How to cite?
Journal: IEEE transactions on circuits and systems. I, Regular papers 
Abstract: Three-phase power-factor-correction (PFC) power supplies are commonly used to convert ac power from a three-phase grid to a regulated dc voltage with unity input power factor. The output voltage regulation is normally achieved by an outer voltage feedback loop and a sinusoidal pulse-width-modulated (SPWM) inner current loop. However, the non-ideal power grid may drive the converter to enter a low-frequency instability region. In this paper, a low-frequency instability phenomenon in three-phase PFC power supplies is reported. The converter can also be regarded as exhibiting a Hopf-type bifurcation in which the dc output voltage oscillates at 150 Hz, and a large amount of harmonics appear on the line current. We develop an averaged model of the grid-converter system to predict the low-frequency instability. The effects of circuit and grid parameters can be studied with this model. Additionally, as a result of the emergence of low-frequency oscillation, the stability boundary leading to a catastrophic bifurcation changes dramatically. Simulation results also provide design-oriented boundaries of operation. This phenomenon is confirmed by experimental measurement.
URI: http://hdl.handle.net/10397/31005
ISSN: 1549-8328
EISSN: 1558-0806
DOI: 10.1109/TCSI.2013.2264698
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