User-defined equipment models for long term and transient stability studies

The growing pressure of environmental issues on power system operation implies a close examination of the actual limits of operation of the system. This has led to a sharp increase in the need for power system dynamics simulation. EUROSTAG is a computer program which simulates continuously transient stability and long term dynamics phenomena. One of its important features is that it allows users to introduce rapidly new equipment through user-defined block-diagrams, and examine their impact on the system behaviour. The use of block-diagrams is arguably the most convenient one in order to introduce new models. The authors describe the features of a program to build up user-defined two examples of power electronics: the control of a DC substation and the control of power flow between parallel lines using a series FACTS device