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Economics dictates the heavy utilization of the major ac and dc transmission paths in the Western United States. To achieve interconnected network stability with these heavy power transfers, extensive remedial action schemes have been implemented by the various transmission projects. These remedial action schemes often pose an operating reliability problem as well as undesirable impacts on non-project systems since activation of these schemes could result in network separation. This paper explores the potentials of utilizing the controllability of the dc lines to reduce the complexity of the remedial schemes or to increase the stability performance of the system so that the impact of existing and future projects on nonproject systems can be minimized.