Bifurcation and Large-Signal Stability Analysis of Three-Phase Voltage Source Converter under Grid Voltage Dips

Meng Huang, Yu Peng, Chi Kong Tse, Yushuang Liu, Jianjun Sun, Xiaoming Zha

Research output: Journal article publicationJournal articleAcademic researchpeer-review

107 Citations (Scopus)


Three-phase voltage source converters (VSCs) are commonly used as power flow interface in ac/dc hybrid power systems. The ac power grid suffers from unpredictable short-circuit faults and power flow fluctuations, causing undesirable grid voltage dips. The voltage dips may last for a short time or a long duration, and vary the working conditions of VSCs. Due to their nonlinear characteristics, VSCs may enter abnormal operating mode in response to voltage dips. In this paper, the transient response of three-phase VSCs under practical grid voltage dips is studied and a catastrophic bifurcation phenomenon is identified in the system. The converter will exhibit an irreversible instability after the dips. The expanded magnitude of ac reactive current may cause catastrophic consequence for the system. A full-order eigenvalue analysis and a reduced-order mixed-potential-theory-based analysis are adopted to reveal the physical origin of the large-signal instability phenomenon. The key parameters of the system are identified and the boundaries of instability are located. The bifurcation phenomenon and a set of design-oriented stability boundaries in some chosen parameter space are verified by cycle-by-cycle simulations and experimental measurement on a practical grid-connected VSC prototype.
Original languageEnglish
Article number7805160
Pages (from-to)8868-8879
Number of pages12
JournalIEEE Transactions on Power Electronics
Issue number11
Publication statusPublished - 1 Nov 2017


  • Catastrophic bifurcation
  • grid voltage dips
  • large-signal stability
  • three-phase voltage source converter (VSC)
  • transient response

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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