Determination of optimal system configuration in Japanese secondary power systems

Yasuhiro Hayashi*, Junya Matsuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In Japan, when a secondary radial power system (66 kV, 77 kV) has a number of connected feeders whose circuit breakers (CBs) can be opened or closed, the combinatorial number of possible system structures created by switching CBs becomes very large. In order to determine the optimal configuration of secondary radial power system in normal state and fault state, a new computation algorithm is proposed. The proposed algorithm is based on enumeration and Reduced Ordered Binary Decision Diagram (ROBDD). In order to verify the availability of the proposed approach, the authors obtain optimal configurations for normal and fault states on IEE of Japan secondary power system model (IEEJ model) by using the proposed method. IEEJ model has the distinctive characteristics of practical Japanese power systems, the total number of configuration candidates is the 76th power of 2 (=75 000 000 000 000 billion approximately). The optimality of the system configuration obtained by the proposed method is mathematically guaranteed.

Original languageEnglish
Pages (from-to)394-399
Number of pages6
JournalIEEE Transactions on Power Systems
Issue number1
Publication statusPublished - 2003 Feb
Externally publishedYes


  • Combinatorial optimization problem
  • Enumeration method
  • IEEJ secondary power system model
  • Japanese power systems
  • Optimal configuration
  • Optimality
  • Reduced ordered binary decision diagram

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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