Key factors affecting voltage oscillations of distribution networks with distributed generation and induction motor loads

N. K. Roy*, H. R. Pota, M. A. Mahmud, M. J. Hossain

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The existence of critical voltage modes in distribution systems and the key factors responsible for them are presented in this paper. The analysis is carried out over a distribution test system for different types of induction motors. Eigenvalues and participation factors are used to investigate the modal interaction within the system. This study shows that load voltage dynamics significantly influence the damping of the voltage modes. These modes have a frequency of oscillation between the electromechanical and subsynchronous oscillations of power systems. Significant parameters of the system which affect the damping and frequency of the oscillation are identified to provide a clear understanding of the problem. A bifurcation study is performed to determine the dynamic loadability limit of the system. Time-domain simulations are carried out to verify the validity of the modal analysis and to provide a physical feel for the types of oscillations that occur in distribution systems. The impact of various distribution network configurations on these modes is also demonstrated through nonlinear simulations.

Original languageEnglish
Pages (from-to)515-528
Number of pages14
JournalInternational Journal of Electrical Power and Energy Systems
Volume53
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Distributed generation
  • Eigenvalue
  • Induction motor
  • Small-signal stability
  • Voltage mode

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