Stability assessment and emergency control method using trajectory sensitivities

Very stressed power systems often lack ability to withstand certain disturbances, what might result in serious consequences. Therefore the tools mitigating such a situation have a crucial significance. This work presents a method for real-time emergency control of power systems based on the trajectory sensitivities. Out of the present conditions a nominal trajectory and its sensitivities is precalculated. If an incipient instability is detected, necessary stabilizing control measures are determined. A short review of trajectory sensitivities and model predictive control is included. A principal description of the method together with a theoretical foundation and examples with simulation results is provided.