Real-time stability assessment in the control centers of the ISO of Bosnia and Herzegovina and a National Dispatching System in North Africa

This paper describes the implementation of real-time stability assessment in the power system control centers of the independent system operator in Bosnia and Herzegovina (NOS-BiH) and, respectively, a National Dispatching System in North Africa. These solutions are conceptually different in terms of stability assessment scope and techniques -- but are very similar in terms of implementation approach. At the NIS-BiH, it provides for rapidly quantifying the risk of blackout, tracking the distance to instability in real-time, and presenting the results in meaningful and user-friendly formats. The technique is based on a fast steady-state stability algorithm that computes the maximum system loadability for the current state and for postulated contingencies. The stability application is seamlessly integrated with the SINAUT Spectrum SCADA/EMS and runs automatically after each successful execution of the State Estimator and/or Dispatcher´s Power Flow. The North Africa solution is based on dynamic security analysis aimed at evaluating the transient system stability conditions in advance of performing scheduled system outages, e.g., major switching actions such as switching transmission lines or large capacitors. Practical experience results are presented and illustrated.