A method for evaluating and ranking the importance of power system equipment based on risk analysis

Abstract

The invention discloses a power system equipment importance assessing and sorting method based on risk analysis. Based on risk assessment of a power system, the importance of power grid equipment for the overall operational risk of the power system under different operating conditions can be shown truly and comprehensively; during assessment of the equipment importance, the commonly-used certainty security standard of power enterprises is also taken into account while comprehensively considering uncertainties of power grid operation, so that the defects that by the conventional importance assessing method, uncertainties of the grid operation cannot be comprehensively considered, the evaluation angle is single, the practicality is not high and the like are effectively overcome, and more comprehensive risk assessment information than that provided by the conventional assessing method can be provided. In the power system equipment importance assessing and sorting method, the equipment importance assessment is carried out by dividing system risk levels, so that both direct influence and indirect influence of the equipment on the safe operation of the power system can be reflected and references can be provided for a local control and optimization scheme of risk management and control of the power system so as to improve responsiveness to the risk management and control of the power system.

Description

technical field [0001] The invention belongs to the technical field of power system safety risk assessment, and in particular relates to a method for evaluating and sorting the importance of power system equipment based on risk assessment. Background technique [0002] In recent years, frequent blackouts have aroused widespread concern and discussion among domestic and foreign experts on the safe and stable operation of power systems. The analysis of the cause of the blackout shows that the accidents are caused by the failure of a very small number of weak links, and then spread in cascade in the power network, eventually leading to a wide range of serious accidents. Identifying weak equipment in the system and eliminating the deep security risks in the weak links of the system are very effective in preventing large-scale power outages. [0003] Based on the risk management method, the purpose of analyzing the importance of equipment is to identify the key equipment that ha...

AI Technical Summary

Problems solved by technology

Sensitivity analysis is suitable for scenarios where component reliability parameters are constant or change very little. When reliability parameters vary greatly, the evaluation error will be relatively large; structural vulnerability analysis can analyze component importance from the topological structure, but cannot Respond to the real-time operation mode and operation status of the power grid

In response to the above problems, relevant scholars have proposed a reliability tracking method from the perspective of reliability analysis: Xie Kaigui titled Tracing the component unreliability contributions and recognizing the weak parts of a bulk power system (European Transactions on Electrical Power, 2011, 21(1): 254-262.) proposed a method to identify the importance of equipment by identifying the "contribution" of system components to system reliability. This method evaluates the importance of equipment under the unified framework of power grid reliability assessment, but its The reliability index and index allocation method lack unity, the evaluation angle is single, and the influence of the real-time operation status of the equipment on the importance of the equipment is not considered

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