Analysis method for line parameter and fault disturbance in power grid

Abstract

The invention discloses an analysis method for line parameters and fault disturbance in a power grid in the technical field of power system measurement and control. The analysis method comprises the steps that a measuring unit measures electrical data of a measuring point within each working frequency cycle; when fault disturbance does not occur, a resistance parameter and a working frequency inductance parameter are calculated, and when the fault disturbance occurs, the voltage disturbance variable and the current disturbance variable of the measuring point are extracted; a measuring point closest to a fault disturbance point and a power transmission line at the position of the fault disturbance point are determined; when low-frequency oscillation fault disturbance occurs, a power transmission line at the position of a low-frequency oscillation disturbance source is determined; otherwise, the position of the fault disturbance point and the circle center coordinates and the radius of a circular area of fault disturbance are calculated; when short-circuit fault disturbance occurs, the radius of a voltage disturbance boundary circle is calculated; and when line breakage fault disturbance occurs, the radius of a current disturbance boundary circle is calculated. The analysis method solves the problem of calculating the working frequency parameters of the power transmission line, the position of the fault disturbance point in the power grid and the fault disturbance area when the power grid is under a stable running state.

Description

technical field [0001] The invention belongs to the technical field of power system measurement and control, in particular to an analysis method for line parameters and fault disturbances in a power grid. Background technique [0002] For transmission lines in large-scale power grids, due to their high voltage levels and the general length of hundreds of kilometers, it is difficult to obtain the simultaneous operation data of the first and last ends of the line in time, which makes it difficult to calculate the power frequency parameters of the line operation. However, the timely and accurate calculation of power frequency operating parameters of transmission lines is of great significance for improving the economy of large-scale power grid operation and rationally configuring the power generation of each generator set in the power grid to reduce the loss of power transmission in the power grid. In addition, due to the aging of equipment and the influence of meteorological f...

AI Technical Summary

Problems solved by technology

In this document, the inventors provide both short-circuit fault disturbance points and low-frequency oscillation disturbance point location methods: first determine the node closest to the disturbance point, and then calculate the disturbance voltage between all nodes adjacent to the nearest node Decay rate, and determine the short-circuit fault disturbance point by the disturbance voltage decay rate and the average value of the disturbance voltage decay rate. This method has a low calculation speed and a large error

In addition, in this document, there is no discussion on the location method of the disturbance point when the disconnection fault disturbance occurs; nor does it provide the calculation method of the center coordinates and radius of the fault area when the fault disturbance occurs; it does not provide when the short-circuit fault disturbance occurs, The calculation method of the radius of the boundary circle of voltage disturbance; and the calculation method of the radius of the boundary circle of current disturbance in the event of a disconnection fault disturbance is not provided

[0005] However, at present, the power grid monitoring center collects effective value data, which cannot be used to quickly extract fault disturbance variables in the power grid, and cannot realize rapid monitoring of fault disturbances in the power grid, which limits the function of the power grid monitoring center

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