Voltage stability analysis considering the uncertainties of dynamic load parameters

J. F. Zhang, C. T. Tse, K. W. Wang, C. Y. Chung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

32 Citations (Scopus)


Many uncertainties exist in power systems and they will affect the stability analysis results. Voltage stability considering uncertainty in load parameters will be discussed. With the assumption that parameter variation is normal distribution, the probabilistic characteristics of eigenvalues under the uncertainties of dynamic load parameters can be obtained. Distribution of the critical eigenvalue will determine the stability probability of a power system. The stability margin can be inferred from the probabilistic critical load level, which is the maximal load level where system is 'probabilistically' stable. Case studies on three test systems illustrate that the stability margin will be reduced with load uncertainty. The proposed probabilistic results are validated using deterministic method of Monte Carlo on multi 10000 sample studies.

Original languageEnglish
Pages (from-to)941-948
Number of pages8
JournalIET Generation, Transmission and Distribution
Issue number10
Publication statusPublished - Oct 2009

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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