Fault Correlation Domain Identification System and Method Based on Fault Component Reactive Power

Abstract

The invention relates to a fault correlation domain identification system based on fault component reactive power and a method thereof and belongs to the electric power system fault identification technology field. The fault correlation domain identification system comprises a correlation domain division subsystem and a protection motion determination subsystem, wherein the correlation domain division subsystem takes each start protection station as a center and takes a same voltage grade outgoing line pair end station as a boundary division protection correlation domain, the protection motion determination subsystem realizes establishment of a protection algorithm model, a protection algorithm information selection module extracts fault component reactive power in a fault association domain, a protection principle module realizes construction of protection action quantity and braking quantity based on the fault component reactive power, a protection motion characteristic module determines and identifies the fault association domain according to protection action. The fault correlation domain identification system can respectively acquire accurate determination results during occurrence of each types of faults in and out of the fault correlation domain, has sensitive and reliable protection performance, not only realizes an electrical network remote backup protection function under a common condition, but also successively solves a problem of protection difficulty under a condition of direct current disappearance of a transformer station and further improves electrical network security.

Description

technical field [0001] The invention relates to a fault correlation domain identification system based on fault component reactive power and a method thereof, and belongs to the technical field of fault identification of substation power systems. technical background [0002] The relay protection configuration in high-voltage transmission lines basically uses current differential protection and distance protection as dual protection, of which distance three-stage protection is used as backup protection. However, distance backup protection only uses local information to respond to faults, and objectively, it can only adopt a step-by-step coordination method to remove faults, resulting in various defects. On-line self-adaptive setting and power flow transfer identification take advantage of wide-area multi-information, but do not innovate the way of protection step-by-step coordination, so part of the performance is mainly improved. The emergence of the fault identification a...

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Problems solved by technology

[0005] 2) The law of energy conservation is applicable to closed areas of any range, so using power information to identify fault-related domains has unique advantages. At present, there are relatively few studies in this area, and active exploration should be carried out while problem 1) is solved

[0006] At the same time, the loss of DC in the substation will lead to the paralysis of the secondary system in the substation, and its own and outgoing line faults need to be provided by the adjacent substation for remote backup.

However, since the substation covers multiple voltage levels, regional current differential and other principles cannot be implemented, and the traditional single-ended remote backup may also have insufficient sensitivity due to cross-transformers. It is still a difficult problem to build a reasonable and effective protection scheme.

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