Optimal placement and sizing method to improve the voltage stability margin in a distribution system using distributed generation

R. S. Al Abri, Ehab F. El-Saadany, Yasser M. Atwa

Research output: Contribution to journalArticle

302 Citations (Scopus)


Recently, integration of distributed generation (DG) in distribution systems has increased to high penetration levels. The impact of DG units on the voltage stability margins has become significant. Optimization techniques are tools which can be used to locate and size the DG units in the system, so as to utilize these units optimally within certain limits and constraints. Thus, the impacts of DG units issues, such as voltage stability and voltage profile, can be analyzed effectively. The ultimate goal of this paper is to propose a method of locating and sizing DG units so as to improve the voltage stability margin. The load and renewable DG generation probabilistic nature are considered in this study. The proposed method starts by selecting candidate buses into which to install the DG units on the system, prioritizing buses which are sensitive to voltage profile and thus improve the voltage stability margin. The DG units' placement and sizing is formulated using mixed-integer nonlinear programming, with an objective function of improving the stability margin; the constraints are the system voltage limits, feeders' capacity, and the DG penetration level.

Original languageEnglish
Article number6218226
Pages (from-to)326-334
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number1
Publication statusPublished - 2013



  • Distributed generation (DG)
  • distribution system
  • optimum power flow
  • voltage profile
  • voltage stability

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

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