Verification processing method for relaying protection setting value

Abstract

The invention provides a verification processing method for a relaying protection setting value. The method comprises the following steps of: reading the real time data of a power grid from an energy management system, and forming a current system running mode; in the current system running mode, performing online verification calculation on a protection setting value of the power grid to judge whether protections which do not meet verification requirements exist or not; if the protections which do not meet the verification requirements exist, forming a set of the protections which do not meet the verification requirements; calculating the probabilities and results of failure to operate on command of each protection in the set, and multiplying corresponding probabilities and results to obtain values-at-risk of failure to operate on command of the protections; calculating the false operation probabilities and results of each protection in the set, and multiplying corresponding probabilities and results to obtain false operation values-at-risk of the protections; calculating the weighted sums of the values-at-risk of failure to operate on command and false operation values-at-risk of the protections to obtain total values-at-risk of the protections; and rearranging the total values-at-risk of all the protections in the set from lower values to higher values.

Description

technical field [0001] The invention relates to the technical field of relay protection of an AC power transmission system, and more specifically, the invention relates to a checking processing method for a fixed value of relay protection. Background technique [0002] The main characteristics of my country's power grid are flexible operation modes, complex fault types, equivalent impedance changes, and load fluctuations. A fault occurs, which leads to a grid accident. [0003] In view of the above problems, the fixed value online checking method is widely used in my country's power grid. The fixed value online check utilizes the real-time data of the power system collected by the energy management system to judge the performance of all protections in the system under real-time operation mode. Once there is a hidden danger of protection refusal / misoperation online, the online verification method will give an alarm message. Since the concept of online calibration was put fo...

AI Technical Summary

Problems solved by technology

[0004] However, with the in-depth application of the online checking system in the power grid, the staff is faced with such a problem: For provincial or regional power grids with large scale and variable operation mode, the checking calculation does not meet the protection requirements of the checking. The number is relatively large, and the staff need to correct the fixed values ​​of all protections in a short period of time, but the priority of fixed value corrections is completely dependent on manual work, lacking scientific basis, difficult to implement, and low in efficiency

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