IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
PI Architecture Functionally Distributed System for Power System Supervisory Control
Masahiko KunugiMasahiko YohdaShinsuke TamuraYukio KishidaTatsuo HayashiTsuguo Hasegawa
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1991 Volume 111 Issue 3 Pages 277-284


In recent years, the sizes of Energy Management Systems (EMS) and Supervisory Control and Data Acquisition (SCADA) systems have grown to huge proportions. This is for two reasons:
•The power systems to which they are applied have grown in size and complexity.
•Their own functions have become more diverse and sophisticated.
This raises the following problems: degradation of response time, decreased reliability, limited expandability, less maintainability, increased costs.
A functionally distributed system that is characterized by parallel processing and independent subsystems (parallel-independent architecture) will solve these problems.
The system is comprised of a group of functional units, each of which runs in parallel, independently and asynchronously. Copies of some programs and power system status data are stored in the relevant functional units, and data-driven architecture is adopted, which eliminates the need for a centralized control mechanism.
The feasibility of a functionally distributed system was tested through construction of a prototype. The resugts were satisfactory.

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