STEADY-STATE SECURITY CONTROL USING A SENSITIVITY-BASED APPROACH

Real time security assessment is gaining more and more attention with the increasing complexity of electrical power systems. Steady-state security control is made to keep the system in a state without violating any constraints. In this paper, an algorithm based on the first-order sensitivities is presented both for real power and for reactive power security control. Relations between uncompensated sensitivity factors used for corrective control and compensated sensitivity factors used for preventive control have been derived theoretically. It is found that the combined effects of a line outage and a line switching cannot be summed directly, because of inherent nonlinearity. The effectiveness of the proposed method is investigated by studying the Taiwan power system. © 1990.