Optimal allocation of shunt Var compensators in power systems using a novel global harmony search algorithm

Reza Sirjani, Azah Mohamed, Hussain Shareef

Research output: Contribution to journalArticlepeer-review

106 Citations (Scopus)


In this paper, a novel global harmony search algorithm (NGHS) is used to determine the optimal location and size of shunt reactive power compensators such as shunt capacitors, static Var compensators (SVCs), and static synchronous compensators (STATCOMs) in a transmission network. The problem is decomposed into two subproblems. The first deals with the optimal placement of shunt Var compensation devices using the modal analysis method. The second subproblem is the optimization of the load flow using the NGHS algorithm. A multi-criterion objective function is defined to enhance the voltage stability, improve the voltage profile, and minimize power loss while minimizing the total cost. The results from a 57-bus test system show that the NGHS algorithm causes lower power loss and has better voltage profile and greater voltage stability than the improved harmony search algorithm (IHS) and particle swarm optimization (PSO) techniques in solving the placement and sizing problem of shunt Var compensators. Finally, a comparison of the convergence characteristics of three optimization methods demonstrates the greater accuracy and higher speed of the proposed NGHS algorithm in finding better solutions compared with PSO and IHS.

Original languageEnglish
Pages (from-to)562-572
Number of pages11
JournalInternational Journal of Electrical Power and Energy Systems
Issue number1
Publication statusPublished - Dec 2012
Externally publishedYes


  • Harmony search algorithm
  • Modal analysis
  • Power loss
  • Shunt Var compensators
  • Voltage profile

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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