Dynamic security margin estimation using artificial neural networks

This paper focuses on transient stability. Two dynamics problems, i.e., transient stability and voltage collapse, should be considered when performing a dynamic security study. Transient stability assessment is a major concern in the DSA for multi-machine power systems. Particularly, a fault on the system or a loss of a large generator can give rise to large electromechanical oscillations between generating units, which might lead to loss of synchronism in the system. For the voltage stability problem, it is associated with the increased loading of long transmission lines and insufficient local reactive power supply. These types of phenomena are characterized by a voltage drop gradual at first, and then collapse. The time interval of the slow voltage decay phase typically is in between 1 to 10 minutes, which is adequate for the operator to exercise the corrective action.