Dynamic security assessment in system operation and planning — First experiences

This paper presents some results of the first experiences with the operation of the Dynamic Security Assessment (DSA) system. The DSA is a part of a comprehensive network security solution and is based on fast time domain contingency simulations, considering main stability issues in transmission networks, voltage stability, transient stability and small signal stability. The DSA system uses the actual and near future operating points as starting points for the dynamic contingency simulations. The results of the dynamic security analyzes are reduced to one index, represented by a color scheme similar to a traffic light. In case of security problems, the user is led through different layers of visualization to be able to find out the reasons for the problem and identify the events leading to instability.