Frequency and active power control in islanded power systems based on the magnitude of the disturbance estimation

Paper presents the difficulties of existing anti-emergency automation when operating in islanded power system. The operation of existing anti-emergency automation is apprized from the point of view of elimination of active power deficiency or surplus. Shortages of existing anti-emergency automation as well as necessary areas for improvements are shown. New method for estimation of active power deficiency or surplus is proposed. It is based on the use of the mathematical description of the considered system to provide more accurate operation of anti-emergency automation, for instance, when shedding load or starting generation reserves. The analysis as well as possible application of the proposed method for estimation of active power deficiency or surplus is presented.