Disaster-impact-oriented cascading failure deduction method and system for power system

By constructing a source-end fault set and a power grid topology model, and combining frequency dynamic calculation and power flow calculation, the accurate deduction and risk assessment of the power grid cascading failure process were realized. This solves the problem that existing technologies cannot simulate power system cascading failures caused by extreme disasters, and improves the power grid's control capability and safety analysis accuracy in disaster scenarios.

CN122437150APending Publication Date: 2026-07-21BEIJING KEDONG ELECTRIC POWER CONTROL SYST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING KEDONG ELECTRIC POWER CONTROL SYST CO LTD
Filing Date
2026-04-20
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing power system simulation methods for disaster scenarios cannot effectively simulate the cascading failure process of power systems caused by extreme weather disasters, electromagnetic pulses, and cyberattacks. They are difficult to accurately assess the evolution of large power grid faults and load losses, lack characterization of the dynamic frequency response of the power grid and the timing of multiple rounds of automatic safety device actions, and cannot continuously and dynamically evolve the power grid from the initial disturbance to the final operating state.

Method used

Construct source-end fault sets and power grid topology models under different disaster events, acquire power grid operation data in real time, trigger automatic safety devices to cut off loads through alternating frequency dynamic calculation and power flow calculation, repeat the calculation until the termination conditions are met, quantify the remaining control and regulation capabilities of the power grid, and construct multi-dimensional safety margin indicators.

Benefits of technology

It enables accurate simulation and operational risk assessment of cascading failure processes in power grids, improves the accuracy and reliability of power grid security analysis, and can continuously depict the dynamic evolution path of the power grid from initial disturbance to final operating state, thereby improving the accuracy of power grid control capability assessment under disaster scenarios.

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Abstract

A disaster-impact-oriented power system cascading failure deduction method and system, the method comprising: constructing a source fault set and a power grid topology model under different disaster events, and acquiring power grid operation data; based on the collected data, updating the frequency of the power grid in the next period; when the frequency in the predefined period meets the predetermined frequency condition, performing load shedding and correcting the node power, and using power flow calculation to determine the steady-state operating point; repeating the frequency calculation and power flow calculation operations to determine the final operating state of the power grid; based on the final operating state of the power grid, the over-limit degree of the transmission line, the main transformer, the bus voltage, the frequency and the transmission section under the corresponding disaster scenario is calculated respectively, and the remaining capacity regulation ability and the regulation ability of the power grid under the disaster scenario are quantified. The present application realizes accurate deduction of the failure evolution process of the power system under the disaster scenario and quantitative evaluation of the operation risk and regulation ability, thereby effectively improving the precision and reliability of the power grid safety analysis.
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Citation Information

Patent Citations

  • Modeling method and device for disaster propagation and risk evolution of power system

    CN120542904A

  • Power distribution network multi-time scale fault scene deduction method, system, device and medium

    CN121580820A