System and method for grid fault identification based on random point distribution PMU

Abstract

The invention discloses a system and method for grid fault identification based on a random point distribution PMU and belongs to the technical field of power system fault identification. The system comprises a fault relative domain identification module, a fault locating module, a fault component identification module and a domain backup protection module. A grid structure changing characteristic is evolved to a branch current difference by the fault relative domain identification module, so that fault relative domain identification is achieved; overall traversal is conducted on a relative domain by the fault locating module, so that accurate location of a fault point is achieved based on a node voltage matching condition; based on virtual current differential, protecting criteria are constructed through an opposite terminal calculated current and a home terminal actually detected current by the fault component identification module, so that fault component identification is achieved; according to domain backup protection operation logic, the near backup tripping function and the far backup tripping function are achieved by the domain backup protection module. Complete domain backup protection under the environment of random PMU point distribution is achieved and the dependence degree on synchronous data of protection is reduced to a great extent.

Description

technical field [0001] The invention belongs to the technical field of power system fault identification, and in particular relates to a power grid fault identification system and a fault identification method based on randomly distributed PMUs. Background technique [0002] Traditional 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 algorithm has completely changed the traditional protection configuration method. Using the multi-point and multi-type information of the power grid to identify the fault correlation domain, fault component or fault point, and directly isola...

AI Technical Summary

Problems solved by technology

However, the actual operation of PMUs in the current power grid does not satisfy the two forms of full distribution and fixed rule distribution.

If the future power grid realizes the full deployment of PMUs and puts them into operation, it is still difficult to ensure that the above two forms of distribution are always available due to the possibility that the PMU device fails or the synchronization error is too large to meet the protection needs.

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