Method and device for solving cascading failure model of power grid

Abstract

The invention provides a power grid cascading fault model solving method and an apparatus which are used for solving the problems that the solving calculation quantity is large and calculation resultsdiffer much from actual situations in a power grid cascading fault calculation process in the prior art. The method comprises the steps of: S101, acquiring the number of sub-power grids included in apower grid after a fault occurs and acquiring power station nodes, transformer substation nodes and lines connecting the nodes, which are included in each sub-power grid; S102, if each sub-power gridhas power station nodes and comprises at least two nodes and has no slack nodes, setting one power station node as a slack node; S103, performing the steps of alternating current optimal power flow and alternating current power flow according to the power station nodes, the transformer substation nodes and the lines in each sub-power grid. The method employs the alternating current optimal powerflow and the alternating current power flow to remove n% of the load for the line with the highest load proportion and then calculation converges. Compared the Manchester model, the method can reflecteconomic dispatch considered in actual power grid operation and obtain results more according with actual situations.

Description

technical field [0001] The invention relates to a model for simulating grid cascading faults, in particular to a method and equipment for solving the grid cascading fault model. Background technique [0002] With the continuous improvement of modernization level and the continuous advancement of smart grid construction, the power grid has become one of the most complex artificial networks in the world. The complexity of the power grid improves the operating efficiency of the power grid on the one hand, and increases the uncertainty of the power grid operation on the other hand. Modern power grid catastrophic accidents are mostly caused by fault chain reaction, which is manifested as a chain reaction trip of a series of components. The possibility of cascading failures is very small, but once it occurs, it will cause serious consequences to the safety of the power grid, which has attracted great attention from scholars at home and abroad. [0003] At present, the cascading ...

AI Technical Summary

Problems solved by technology

However, in the process of solving the power flow of the Manchester model, non-blackout faults may be judged as blackout faults, resulting in the result that the scale of cascading faults obtained may be larger than the actual situation, that is, the problem that the calculated results are greatly different from the actual situation

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