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The damping of large power systems may be poor at heavy system loading condltions. Thls may occur even with traditional supplementary damping controls in service. This paper presents a practical coordinated system-wide approach to this problem. Multlvariable control techniques. tnvolving many machines and associated measurements and controls, are applied on a large scale system wlth realistic dynamlcs.A unique iterative design method, with multtple tasks, is presented.Use of elgenvector based dynamic reduction, sub-optimal state space control design, reconstitution of design to full system representation, and verlflcatlon is shown. The resulting hierarchical controller Is shown, with time slmulatlons and eigenvalues. to stabilize the system for heavy power transfer without adverse slde effects.

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