Calculation method of GIC and PSP of buried oil and gas pipeline influenced by geomagnetic storm

Abstract

The invention discloses a calculation method of GIC (Pipe to Soil Potential) and PSP (Geomagnetically Induced Current) of a buried oil and gas pipeline influenced by geomagnetic storm. The method comprises the following steps of: 1, establishing a LZS-DSPL model; 2, identifying an LZS-DSPL model parameter 'soil longitudinal resistance'; 3, presetting geomagnetic storm data, input pipeline and nearby environment related parameters; 4, establishing GIC and PSP matrix equations through a Kirchhoff's law loop circuit method or a node voltage method; 5, solving numerical solutions of the GIC and PSP matrix equations, and drawing GIC and PSP curves. According to the calculation method of GIC and PSP of the buried oil and gas pipeline influenced by geomagnetic storm, the difference of grounding concepts of electric systems and pipelines and the core effect of soil resistance are considered, precision of the model is improved, thus, pipeline GIC and PSP theories are more approximate to actual monitoring values, and actual pipeline systems are facilitated to perform accurate simulated analytical investigation.

Description

technical field [0001] The invention relates to the technical field of natural disaster prevention for buried oil and gas pipelines, in particular to a calculation method for GIC and PSP of buried oil and gas pipelines affected by geomagnetic storms. Background technique [0002] As a natural disaster and its defense measures, geomagnetic storm has attracted more and more attention. The mathematical model of buried oil and gas pipeline (referred to as pipeline) system is an important theoretical basis for studying the impact of geomagnetic storm on pipelines. [0003] The prior art related to the present invention is: A.P et al. first proposed in 2001 to use the distributed source transmission line model (abbreviated AP-DSTL model) of the high-voltage power frequency power system to replace the mathematical model of the pipeline system, and established the AP-DSTL model of the pipeline affected by the geomagnetic storm. -DSTL models such as figure 1 As shown, among them, th...

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Problems solved by technology

[0004] The research of the inventor of the present invention shows that the shortcoming of this model is: (1) the assumption condition of " reference electrode ground " is unreasonable

(3) The AP-DSTL model structure cannot explain the physical meaning of "buried"

(4) AP-DSTL model parameters do not reflect the "buried" feature

It can be seen from the AP-DSTL model that there are no parameters characterizing "buried", which is inconsistent with the actual pipeline system

(4) The effect of the potentiostat on the pipeline is incorrect

(5) The influence of devices such as decouplers on the pipeline is incorrect

(6) The theoretical calculation of the geomagnetically induced current GIC (Geomagnetically Induced Current) and the pipe-to-soil potential PSP (PipetoSoilPotential) is too large, which is far from the actual monitoring value

Obviously, the AP-DSTL model obtained by the analog translation of the transmission line model does not take into account the longitudinal resistance of the soil near the buried pipeline, so it is almost impossible to correctly describe the buried pipeline affected by the geomagnetic storm

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