Irreversible bifurcation phenomenon in power-grid connected converter systems

Cheng Wan, Meng Huang, Chi Kong Tse, Siu Chung Wong, Xinbo Ruan

Research output: Journal article publicationJournal articleAcademic researchpeer-review


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.
Original languageEnglish
Article number1250155
JournalInternational Journal of Bifurcation and Chaos
Issue number6
Publication statusPublished - 1 Jan 2012


  • bifurcation
  • instability
  • Power converter
  • power grid

ASJC Scopus subject areas

  • Modelling and Simulation
  • Applied Mathematics

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