Equipment and System Modeling for Large-Scale Stability Studies

As systems have increased in size and complexity, and as the number of firm-power ties between systems have increased, the nature of the system stability problems has changed. Furthermore, there is also a demand for more accurate engineering analysis of these complex problems. Although much effort has been devoted to searching for alternate methods, the practical and effective method for large-scale studies is still the simulation of the system response, with time, following a prescribed disturbance. This emphasis on simulation necessarily requires system and equipment models which adequately represent their behavior over some time span, usually less than 20 seconds.