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Design and Application of Power Grid Security Risk Assessment and Hierarchical Control System in Natural Disasters

Due to the failure uncertainty caused by natural disasters, it is of importance to expand the security analysis of power system based on deterministic rules to the risk analysis, to expand traditional security margin control based on deterministic scenarios to risk control. In this paper, the characteristics of clustered faults in natural disasters are analyzed firstly. Secondly, the security risk index system of power grid in natural disasters is designed from six dimensions, and the normalized method of multi-dimensional security risk index is proposed. Further, the risk hierarchical decision-making technology of power grid based on the coordination between risk and cost is proposed. On this basis, the architecture of risk assessment and preventive control system based on provincial and regional coordination is designed. Finally, The effectiveness of the proposed method is verified by a practical operation case of a provincial power grid.