Robustness of an energy storage system-based stabiliser to suppress inter-area oscillations in a multi-machine power system

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Robustness of an energy storage system-based stabiliser to suppress inter-area oscillations in a multi-machine power system

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In order to understand how an energy storage system (ESS)-based stabiliser suppresses a power system inter-area oscillation in a multi-machine power system, this study proposes a tie-line power oscillation-related ESS linearised model. Based on the linearised model, a general conclusion is established to assess the capability of the ESS-based stabiliser to affect the damping of the inter-area power oscillation. Analysis derived from the general conclusion explains how and why the robustness of the ESS stabiliser is different to the variations of the loading conditions of the tie transmission line when the stabiliser is realised by controlling the exchange of either active or reactive power between the ESS and the rest of the power system. It is analytically concluded that when the stabiliser is implemented via controlling the exchange of active power, the stabiliser is of better robustness. The study presents an example multi-machine power system installed with a battery energy storage system (BESS)-based stabiliser. Results of eigensolutions computation and non-linear simulation demonstrate and confirm the analytical conclusion about the robustness of the ESS-based stabiliser in suppressing the inter-area power oscillation.

Inspec keywords: damping; battery storage plants; power system stability; reactive power; eigenvalues and eigenfunctions; energy storage

Other keywords: eigensolutions computation; ESS linearised model; multi-machine power system; battery energy storage system based stabiliser; nonlinear simulation; energy storage system-based stabiliser; reactive power; inter-area oscillations; tie-line power oscillation

Subjects: Control of electric power systems; Secondary cells; Power system control; Linear algebra (numerical analysis); Other power stations and plants; Linear algebra (numerical analysis)

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