Power transmission line parameter identification method and device based on fault recording data

Abstract

The invention discloses a power transmission line parameter identification method based on fault recording data. Compared with the method of applying online parameter identification based on the asynchronous fault recording data of the two ends of a line in the prior art, a factor that the fault recording data entering into the two ends of a power transmission line is not synchronized is considered in the method of the invention through calculating an asynchronous factor between the fault recording data of the two ends of the power transmission line and introducing the asynchronous factor in the online parameter identification so that the influence of the asynchronous factor on the accuracy of the online parameter identification is eliminated, the parameters of the power transmission linecan be accurately calculated and the normal operation of the monitoring and maintenance work of an electrical power system is ensured. The invention also discloses the power transmission line parameter identification device and equipment based on the fault recording data, and a computer readable storage media which have the above advantages.

Description

technical field [0001] The present invention relates to the technical field of power systems, in particular to a method, device, equipment and computer-readable storage medium for identifying parameters of transmission lines based on fault recording data. Background technique [0002] Transmission line parameters are an important part of the basic data of the power grid, and their correctness directly affects the final calculation of power flow calculation, fault analysis, network loss calculation, relay protection setting calculation, short-circuit current calculation, fault location and selection of power system operation mode. result. If the parameters of the transmission line used in the work are inaccurate, it may have a great impact on the power system, and even cause a major power accident. [0003] The parameters of the transmission line in the power system can adopt the design value or the measured value. Because the actual operating conditions of the transmission ...

AI Technical Summary

Problems solved by technology

Among them, the PMU deployment rate is low, its measurement range cannot cover a large range, and the measurement accuracy is poor when the power grid is faulty, and it cannot be used to identify the zero-sequence parameters of the line; The basic conditions for online parameter measurement applications, and can accurately measure power grid fault data, which can be used to identify zero-sequence parameters of the line

However, the existing online identification and estimation methods of transmission line parameters are mainly proposed based on the synchronous measurement of sampling data at both ends of the line, but the fault recording data cannot meet the data synchronization requirements of the station end. Therefore, the existing The online parameter identification method cannot accurately calculate the line parameters

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