IRREVERSIBLE BIFURCATION PHENOMENON IN POWER-GRID CONNECTED CONVERTER SYSTEMS

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Author(s)

  • Cheng WAN
  • Meng HUANG
  • Chi K. TSE
  • Siu-Chung WONG
  • Xinbo RUAN

Detail(s)

Original languageEnglish
Article number1250155
Journal / PublicationInternational Journal of Bifurcation and Chaos
Volume22
Issue number6
Publication statusPublished - Jun 2012
Externally publishedYes

Abstract

Three-phase voltage source converters (VSC) are commonly used to convert ac power from a three-phase grid to a regulated dc voltage with unity input power factor. The control of the VSC is normally achieved by an outer voltage feedback loop and a sinusoidal pulse-width-modulated (SPWM) inner current loop. However, the nonideal power grid and the presence of other interacting loads give rise to nonlinear operation and drive the VSC to enter an irreversible instability region. In this paper, an irreversible bifurcation phenomenon in a three-phase voltage-source converter connected to a power grid with an interacting load is reported. The converter can also be regarded as exhibiting a catastrophic bifurcation in which the input current expands to cause undesirable component stress. A large-signal analysis is adopted to identify the physical origin of the phenomenon and to locate the boundary of the instability. © 2012 World Scientific Publishing Company.

Research Area(s)

  • bifurcation, instability, Power converter, power grid

Citation Format(s)