Abstract
This paper develops the coordination of a load shedding scheme for a large integrated steelmaking cogeneration facility. A detailed description of each design procedure is given. The loads are tripped by the underfrequency relays to prevent the power system from collapsing when the plant becomes isolated due to utility service outage. Suitable models of generators, exciters, governors and loads are included in the transient stability program to derive the proper formulation of the load shedding scheme. The key factors such as underfrequency settings, number of load shedding steps, size and location of the loads to be tripped, relay time delay and the coordination with the generator protection scheme were examined carefully during the computer simulation. The case of an actual system fault has been selected for the transient stability study to prove the accuracy of the load shedding scheme. The load shedding hardware has been installed in the plant according to the proposed strategy to prevent the system from blackout when a disturbance occurs.
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