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Infrastructure Resilience Conference 2018

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A Model Predictive Approach to Preventing Cascading Failures of Power Systems

Power system blackouts are usually triggered by the initial contingency and then deteriorate as the branch outage spreads quickly. Thus, it is crucial to eliminate the propagation of cascading outages in its infancy. In this paper, a model predictive approach is proposed to protect power grids against cascading blackouts by timely shedding loads on buses. Specifically, the cascading dynamics of power grids is described by a cascading outage model of transmission lines coupled with the DC power flow equation. And a nonlinear convex optimization formulation is established to characterize the optimal load shedding for mitigating cascading failures. Then two protection schemes are designed on the basis of the optimization formulation: one scheme carries out one remedial action once for all, while the other takes protection measures at two consecutive steps. Saddle point dynamics is employed to provide a numerical solution to the proposed optimization problem, and its global convergence is guaranteed in theory. Finally, numerical simulations on IEEE 57 Bus Systems are implemented to validate the proposed approach in terms of preventing the degradation of power grids.

Chao Zhai

Hehong Zhang
Nanyang Technological University
Singapore

Gaoxi Xiao
Nanyang Technological University
Singapore

Tso-Chien Pan
Nanyang Technological University
Singapore

 

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