Magnetic storm induction geoelectric field calculation method and device considering coast effect

Abstract

The invention relates to the technical field of magnetic storm induction geoelectric fields, and particularly relates to a magnetic storm induction geoelectric field calculation method and device considering a coast effect. The magnetic storm induction geoelectric field calculation method considering the coast effect comprises the steps that a geoelectric conductivity model is determined, original magnetic storm data is collected, and a geoelectric field base value is determined according to the geoelectric conductivity model and the original magnetic storm data; transmission line characteristic parameters of the geoelectric conductivity model are determined, and the distortion electric field negative potential gradient is determined according to the earth electric field base value and the transmission line characteristic parameters based on the geoelectric conductivity model; and the magnetic storm induction geoelectric field is determined according to the geoelectric field base value and the distortion electric field negative potential gradient. By adopting the scheme, the calculation efficiency is effectively improved by avoiding the use of a numerical solution, the distribution condition of the magnetic storm induction geoelectric field in the direction perpendicular to the sea-land boundary surface can be given, and meanwhile, the method can be used for evaluating the influence of the transverse conductivity change on the geoelectric field and the GIC in the long conductor during the magnetic storm period.

Description

technical field [0001] The present application relates to the technical field of geoelectric fields induced by magnetic storms, in particular to a calculation method and device for geoelectric fields induced by magnetic storms considering coastal effects. Background technique [0002] During a space weather event, the interaction between the solar wind and the Earth's magnetic field causes geomagnetic disturbances. According to Faraday's law of electromagnetic induction, the changing geomagnetic field will generate a geoelectric field, thereby inducing a current with a frequency of 0.0001-0.01Hz in the grounded conductor loop, called geomagnetic induction current (GIC). This quasi-DC flows in the ground-based system, which affects the normal operation of the system and makes the system face security threats. In the power system, GIC flows into the transformer through the neutral point of the transformer, which can make the transformer half-wave saturated, resulting in overh...

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Problems solved by technology

[0006] For this reason, the first purpose of this application is to propose a calculation method for the magnetic storm induced geoelectric field considering the coastal effect, to solve the technical problem that the calculation process of the magnetic storm induced geoelectric field considering the coastal effect is relatively complicated at present

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