Permissible Power Flows Identification for the Stability Margin Monitoring System based on the Adaptive Heavy-Loaded Trajectory

Identification of the permissible active power flows in controlled sections (CS) of power systems (PS) is one of the important tasks solved by system operators at the stage of the short-term planning and in real-time control of a regime as in Russia as abroad. The value of the maximum allowed active power flows (MAAPF) and the emergency active power transfer limits (EAPTL) depends on various factors, for example, an ambient temperature; the generators mix at power plants; amount of load’s and generator’s active power; active power flows through adjacent CS; amount of control actions (CA) received from emergency control automation systems. When the technologist calculates the MAAPF and EAPTL values using the PS digital model (DM) corresponding to the control regime measurements, he can consider only the limited number of PS states. In addition to this, he is forced out taking into account the worst possible PS state, even if it may not occur in a real operation regime.