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This study demonstrates the application of a wide-area control scheme based on multi-functional multi-band power system stabilisers (MF-MBPSS) in New York State grid for the purpose of system stability improvement. The aspects of oscillation damping, frequency and voltage closed-loop control are considered. The study describes useful techniques for placing and tuning of MF-MBPSSs based on simulation models and suitable techniques for very large power grids. The application of these concepts is demonstrated on a transient stability model of Eastern Interconnection. Results show a reduction of system frequency nadir during generation outages, significant improvement in damping of post-disturbance swings and capabilities to contribute to long-term voltage stability using only a modest amount of dynamic reactive power resources. [ABSTRACT FROM AUTHOR]