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Conventional inertia control strategies (i.e., the VSG-based and PD-basedstrategies) for the fast frequency regulation resources (FFRs) might lead tosystem oscillations due to their emulations of generator dynamics. Theonly-droop-based inertia control strategy is a feasible idea to address thisissue. This letter quantitatively investigates the equivalent inertia providedby the droop control of the FFRs. First, an equivalent-scenario-based method isproposed to evaluate the equivalent inertia provided by the droop control,which shows that the droop control with a constant droop coefficient providestime-variant equivalent inertia. Then, the time-variant-droop-based equivalentinertia control (VDIC) strategy is proposed for the FFRs, which can provide therequired constant inertia support without introducing generator-like dynamics.A case study verifies the effectiveness of the VDIC strategy.

Equivalent Inertia Provided by Droop Control of Fast Frequency Regulation Resources