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

AbstractIn order to understand how an energy storage system (ESS)-based stabiliser suppresses a power system inter-areaoscillation 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 toaffect the damping of the inter-area power oscillation. Analysis derived from the general conclusion explains how and whythe robustness of the ESS stabiliser is different to the variations of the loading conditions of the tie transmission line whenthe stabiliser is realised by controlling the exchange of either active or reactive power between the ESS and the rest of thepower system. It is analytically concluded that when the stabiliser is implemented via controlling the exchange of activepower, the stabiliser is of better robustness. The study presents an example multi-machine power system installed with abattery energy storage system (BESS)-based stabiliser. Results of eigensolutions computation and non-linear simulationdemonstrate and confirm the analytical conclusion about the robustness of the ESS-based stabiliser in suppressing the interareapower oscillation13 Halama