A Visualization Tool for Real-Time Dynamic Contingency Screening and Remedial Actions

This paper proposes a real-time visual interactive transient stability screening and remedial action tool that uses an approach based on Lyapunov functions to enable the selection of appropriate remedial actions that stabilize power systems due to large disturbances and cascading failures. At present, there is no effective tool to assist operators in making a well-informed choice from amongst a profusion of remedial action alternatives. Conventionally, transient stability analysis of power system is performed off-line to assess the capability of the power system to withstand specific disturbances and to investigate the characteristic response of the power network as the network returns back to normal operations. In this work, post-fault stable and controlling unstable equilibrium points are determined using a homotopy-based approach. Subsequently, stability assessment of the system and the corresponding potential remedial actions are determined from the equilibrium points of the system dynamical model. The real-time transient stability analysis and remedial action algorithm are incorporated with the visualization tool to facilitate interactive decision making in real-time. The transient stability analysis and remedial action algorithm and the visualization tool are demonstrated on the New England 39 bus test system.