  Load shedding is the last and most expensive control action against system
collapse and blackout. Achievement of an efficient emergency control to
stabilize the power system following severe disturbances, requires two key
objectives. First, preventing of further cascading outages, i.e. saving the
available and determinant power system elements and second, issuing proper
control actions to stabilize the power system inside the permissible time
frame. In this paper online contingency analysis is performed to monitor secure
and reliable operation of transmission lines. Load shedding locations are
continuously updated based on loading rate/thermal limit of lines to prevent
their outage. Simulation of severe contingencies carried out on 39 bus IEEE
standard test system in DIgSILENT power-factory validates the efficiency of
proposed method.
