Anticipated fault assist decision-making method and device of ultrahigh-voltage DC circuit

Abstract

The invention provides an anticipated fault assist decision-making method and device of an ultrahigh-voltage DC circuit. The method comprises the steps of calculating influence of assist decision-making adjustable measure on an active power of out-of-limit equipment, and acquiring a heavy-load equipment list; determining an assist decision-making strategy; and verifying the assist decision-making strategy, and determining adjustable margin of heavy-load equipment in the heavy-load equipment list. With the technical scheme provided by the invention, power flow transfer caused by an ultrahigh-voltage direct current anticipated fault is finely considered, heavy-load or out-of-limit power grid equipment caused by the ultrahigh-voltage direct current anticipated fault can be accurately judged, a cost coefficient of an optimal control target is set based on an optimization algorithm, the priority of the ultrahigh-voltage fault adjustment strategy is considered already, the ultrahigh-voltage direct current anticipated fault assist decision-making strategy measure is automatically generated by optimal calculation, on one hand, the heavy-load/out-of-limit equipment is eliminated, and on the other hand, the frequency of a power grid can be recovered to a normal level as soon as possible.

Description

technical field [0001] The invention relates to an online security and stability analysis technology of a power system, in particular to an auxiliary decision-making method and device for an expected failure of an UHV DC line. Background technique [0002] With the rapid development of large-scale interconnection of power grids, my country's power grid will form an AC-DC hybrid power grid with the highest voltage level, the largest transmission capacity, the most advanced technology level, and the most complex operating characteristics in the world, with the UHV grid as the backbone grid. With the advancement of UHV power grid construction, and the increasing operating pressure brought about by the application of a large number of power electronic components such as DC transmission and FACTS, and the large-scale access of wind power and photovoltaic new energy sources, the electrical connection of the entire network is becoming increasingly close, and the coupling between sec...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the present invention aims at the expected failure of UHV DC, and in combination with the characteristics of large transmission power of UHV DC, proposes an auxiliary decision-making method and device for the expected failure of UHV DC line based on optimal calculation. Solve the problem that conventional safety analysis cannot accurately consider the power flow transfer caused by UHV DC expected faults, and solve the problem that conventional auxiliary decision-making cannot simultaneously consider the elimination of equipment over-limit heavy load and the rapid restoration of grid frequency

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