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This paper proposes a novel wide-area control strategy for modulating theactive power injections to damp the critical frequency oscillations in powersystems, this includes the inter-area oscillations and the transient frequencyswing. The proposed method pursues an efficient utilization of the limitedpower reserve of existing distributed energy resources (DERs) to mitigate theseoscillations. This is accomplished by decoupling the damping control actions atdifferent sites using the oscillation signals of the concerned mode as thepower commands. A theoretical basis for this decoupled modulating control isprovided. Technically, the desired sole modal oscillation signals are filteredout by linearly combining the system-wide frequencies, which is determined bythe linear quadratic regulator based sparsity-promoting (LQRSP) technique. Withthe proposed strategy, the modulation of each active power injection can beeffectively engineered considering the response limit and steady-state outputcapability of the supporting device. The method is validated based on atwo-area test system and is further demonstrated based on the New England39-bus test system.

A Novel Wide-Area Control Strategy for Damping of Critical Frequency Oscillations via Modulation of Active Power Injections