Fatemeh MirMohamadi - Department of Electrical Engineering, AmirKabir University Tehran, Iran
Ahmad Afshar - Department of Electrical Engineering, AmirKabir University Tehran, Iran

In this paper, the effects of communication link failure in hierarchical control of large scale power systems are studied. Due to the complexity of an analytical approach, a linguistic model is preferred and a set of fuzzy rules has been generated to enable the prediction of coordinator performance on the many different operational conditions. It has been tried to consider the major parameters of large scale power systems which have a distinctive role in this overall performance and specifically the coordination. Simulation results show that in normal communication conditions of the system, if a link is disconnected, the coordination time should be equal or greater than the time constant of the system to avoid steady state error. However, in abnormal conditions, it's better to have short coordination times to achieve acceptable performance.

Large Scale Power System, Coordination, Optimization, Extended Interaction Prediction Method, Communication Links Failure, Fuzzy Modeling,