Power grid emergency control method and device for dealing with impact of DC faults on weak AC channels

Abstract

The invention provides a power grid emergency control method and device for dealing with the impact of DC faults on weak AC channels. The method includes the following steps: determining the total cut-off limit according to the total power loss of multiple DC lines after simultaneous locking faults and the total surplus power of weak AC channels; determining the additional cut-off quantity allocation coefficient of each DC line according to the minimum cut-off demand of the DC lines with simultaneous blocking faults; and determining the additional cut-off quantity of each DC line according tothe total cut-off limit and the additional cut-off quantity allocation coefficient of each DC line, and performing cut-off control. The technical scheme provided by the invention can take into accountboth the cut-off demand in case of a blocking fault of a single DC line and the cut-off demand in case of simultaneous blocking faults of multiple DC lines, and has good adaptability to multi-fault scenarios. The technical scheme has the advantages of being simple in principle, stable and reliable, and highly operable and practical, and has high practical value and good market prospects.

Description

technical field [0001] The invention relates to a method in the technical field of electric power system stability control, in particular to a power grid emergency control method and device for dealing with a DC fault impacting a weak AC channel. Background technique [0002] At present, energy resources and load centers present the characteristics of reverse distribution, which objectively determines that the current power grid structure has the characteristics of large power supply, large power grid, large capacity, and long-distance power transmission. Long-distance cross-regional DC transmission technology has the characteristics of large transmission capacity, fast controllability, and effective limitation of short-circuit current, which makes up for the shortcomings of traditional AC transmission and has been widely developed. [0003] With the intensive commissioning of UHVDC power transmission projects, there are the following typical AC-DC power transmission scenari...

AI Technical Summary

Problems solved by technology

In the past, only a single DC blocking fault scenario was considered in the design of the DC safety control system. When multiple DC blocking faults occur at the same time, there is a risk of line disconnection due to insufficient safety control cut-off capacity and superimposed transfer of surplus power to the AC weak connection channel.

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