Composite power systems reliability evaluation based on demand‐side reserve

Yasunori Mottate, Hiroumi Saitoh, Junichi Toyoda

Research output: Contribution to journalArticlepeer-review


This paper proposes new demand‐side reliability indices and useful computational methods for reliability evaluation of composite power systems. These new indices are based on the active power which can reach each demand spot under generating and transmission network constraints. This conception is defined as “reachable power,” and it leads the reserve margin on each demand spot, which is called as “demand‐side reserve.” If the reachable power is insufficient to satisfy the demand, load curtailment is required. In the proposed approach, the conception of the load curtailment area is defined, and the estimate method of load curtailment area is indicated. In case the reachable power exceeds the demand, system reliability is evaluated by the demand‐side reserve, and the power system is divided into several reliability zones according to the demand‐side reserve levels. Small system examples are used to illustrate principles of the proposed approach, and middle system examples show the effectiveness and practicality.

Original languageEnglish
Pages (from-to)68-78
Number of pages11
JournalElectrical Engineering in Japan
Issue number7
Publication statusPublished - 1994


  • Reliability evaluation
  • demand‐side reserve
  • linear programming
  • load curtailment area
  • reliability zoning

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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