The boiler's effect over the electrical power system during a major critic disturbance

In this article a long-term frequency stability analysis of a multi-machine system after a critic event is developed. Firstly, the variations of the pressures in the boiler is considered and its influence over the electrical system dynamic, as well as the turbine's operational limits due to fatigue for resonant frequencies. Secondly, to reduce the frequency deviations, we use and contrast two technics, the fast valving, and the load shedding.