Online examination method of relay protection setting value based on dynamic short-circuit current

Abstract

The present invention discloses an online examination method of relay protection setting value based on dynamic short-circuit current, which includes the following steps of: (1) obtaining real-time network-wide measurement data through EMS to establish an electrical network model; (2) carrying out a credibility assessment to the network-wide measurement data and to obtain the data which passes the assessment; (3) carrying out a dynamic short-circuit current calculation to the data passing the credibility assessment; (4) carrying out a setting calculation and examination of the protection setting value. The method enhances the accuracy of the short-circuit calculation result, realizes the online examination and real-time early warning of the relay protection setting value, and improves the automation degree of the protection setting value work.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, in particular to a method for checking the fixed value of a relay protection device. Background technique [0002] In recent years, with the rapid development of the power grid, a large number of power grid infrastructure, power transmission, and power grid transformation projects have been put into operation, and the calculation work of relay protection setting value can no longer meet the requirements of the production cycle. During the commissioning process of infrastructure construction and technical upgrading projects, the ways of accompanying bus stop, line accompanying stop, and power grid disconnection are becoming more and more complicated. The work of setting calculations presents a formidable challenge. [0003] The traditional calculation method of relay protection fixed value is based on the normal mode of power grid operation, and the offline calculation is car...

AI Technical Summary

Problems solved by technology

However, the above-mentioned patent method uses the static network impedance equivalent method for fault calculation, and does not consider the detailed transient model of the power system, and does not consider various regulating controllers ( Generator voltage regulator, governor, power system stabilizer, etc.), that is, only the instantaneous value of the short-circuit current at the time of the short-circuit fault is obtained, and the dynamic change process of the short-circuit current that is more in line with the actual engineering situation is not obtained; and, the above The patented method does not involve the data interface between the protection setting online checking system and the existing protection setting list offline setting system, protection information management system and protection devices

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