© 1979 by British Computer Society
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Interactive computation and data management for power system studies*

Electricity Supply Commission, Information Systems Department, P.O. Box 1091, Johannesburg, South Africa
An integrated computer package for power system analysis studies (POWSYS) has, for some years, been available to engineers in the Electricity Supply Commission (South Africa). POWSYS offers a system design and ease of operation which minimises the efforts required by power system engineers in using the computer. Its three main features are: a data base structure; a collection of power system analysis programs; and a command language through which the user controls the system by requesting data retrieval and programs execution.
POWSYS package provides planning and operation engineers with the capability to interact directly, via a computer terminal, in the design and analysis of electrical networks. Using a simple command language the engineer has a direct conversational interaction with the computer. Through the terminal he can obtain, via the data base management system, the data describing a particular power system network. The data base facilities enable a series of studies to be carried out on a uniform basis, varying either the system parameters or the type of study (load flow, transient stability, etc.)
The analysis programs which are at present included in the system are AC load flow, short-circuit, transient stability, travelling waves, line parameters, network reduction and B-constants. The system has been designed so that all these analysis programs use a common power system data base. Experience so far has shown that the provision of an interactive computer package for power system analysis is of great value. The ability to control the sequence of studies interactively from a computer terminal has increased the productivity of power system engineers significantly.
Received December 1977.
* The contents of this paper were taken from the doctoral thesis of G. Z. Ben-Yaacov entitled Energy Modelling in the South African Electric Power Industry, submitted to the University of Cape Town in February 1977.
Electricity Supply Commission, Information Systems Department, P.O. Box 1091, Johannesburg 2000, South Africa