Risk assessment method of earth induction current in mid and low latitude local power net

Abstract

The present invention relates to the electric power technology research field, especially to a risk assessment method of earth induction current in a mid and low latitude local power net. The method comprises: according to geomagnetic field monitoring data, based on an equivalent current system model, obtaining a geomagnetic field horizontal component; according to the geomagnetic field horizontal component, based on a plane wave model and a ground conductivity model, obtaining an earth induction electric field value; according to the earth induction electric field value, based on a circuit model, obtaining the theory value of the earth induction current; and according to the theory value of the earth induction current and actual correlation parameters, assessing the risks of different horizontal earth induction currents. The risk assessment method of earth induction current in the mid and low latitude local power net can reduce the geomagnetic field horizontal component errors generated caused by a long distance between a geomagnetic monitoring station and a geomagnetic monitoring point and can improve the calculation precision of the theory value of the earth induction current, and therefore, the risk assessment method of earth induction current in the mid and low latitude local power net can substantially improve the accuracy of the risk assessment of the earth induction current in the mid and low latitude local power net.

Description

technical field [0001] This application relates to the field of electric power technology research, in particular to a risk assessment method for geomagnetically induced currents in mid- and low-latitude local area power grids. Background technique [0002] The large-scale explosive activity of the sun will have a wide-ranging impact on the global power grid system. The impact mechanism is: the interaction between the solar wind carrying high-speed plasma and the earth's magnetosphere causes a large disturbance in the geomagnetic field in a short period of time, and generates a strong geomagnetic induction electric field across a large area on the ground. The current driven by the electric field in the artificial conductor on the surface is called Geomagnetically Induced Current (GIC). [0003] When the local magnetic induction current flows into the transformer through the grounded neutral point, the iron core of the transformer will be saturated in half a cycle, and a lar...

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Problems solved by technology

However, due to factors such as the long distance between the geomagnetic monitoring station and the monitoring point, and the unreasonable selection of the earth conductivity model, there is a large error between the calculated results of the theoretical model and the actual values.

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