A Method for Calculating Geomagnetic Induction Current in Power Grids in Middle and Low Latitude Areas

Abstract

The invention discloses a method for calculating geomagnetically induced current (GIC) of a grid in a middle-low latitude region. According to the method, on the basis of a global three-dimensional magnetosphere numerical model (a PPMLR-MHD (Lagrangian version of Piecewise Parabolic Method-Magnetohydrodynamic) model), solar wind parameters observed by a satellite serve as input conditions, geomagnetic disturbance generated by current is calculated by performing integration on a magnetic layer and an ionized layer current system, the geomagnetically induced current in the ground grid is calculated, the problem that the transitional predicting method is not suitable for calculating the GIC in the middle-low latitude region is solved, and the GIC of the grid in the middle-low latitude region calculated by the method can reflect the basic characteristic of the induced current which is actually monitored and is calculated by geomagnetic disturbance. By the method, people can timely calculate the GIC of the grid in the middle-low latitude region according to the solar wind parameters observed by an upstream satellite, whether the grid is invaded by a disastrous space weather event or not is estimated, and an active prevention measure is taken to prevent serious economic and social loss.

Description

technical field [0001] The present invention relates to the intersection field of space weather science and electric power engineering, and more specifically, the present invention relates to a method for calculating geomagnetically induced currents in power grids in middle and low latitude regions. Background technique [0002] The Geomagnetically Induced Current (GIC) in the power grid caused by solar activity is an important phenomenon of space weather disasters. This quasi-DC current will lead to the half-wave saturation of the transformer and cause the grid harmonic current increase and voltage drop, reactive power fluctuations, etc., which may lead to tripping, low voltage or more serious grid paralysis and other consequences, resulting in serious social and economic consequences. loss. [0003] In high latitude regions, geomagnetic activities are more frequent and vary greatly. The influence of GIC on electrical systems was first studied in these regions (such as Nor...

AI Technical Summary

Problems solved by technology

Therefore, in the past, the method of estimating the GIC in the power grid using the solar wind conditions observed by satellites as an input, and the method of calculating the GIC by calculating the geomagnetic disturbance caused by the ionospheric current generated by the solar wind (not including the influence of the magnetosphere current system) cannot GIC for calculating low and middle latitudes

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