Method, system and device for calculating sequence parameters of superconducting cable power transmission line and medium

Abstract

The invention discloses a superconducting cable power transmission line sequence parameter calculation method, system and device and a medium, and the method comprises the steps: obtaining the structure parameters and electrical physical parameters of a superconducting cable, and the electrical physical parameters comprise magnetic conductivity, conductivity and resistance; calculating an induced electric field and an induced current density vector of the shielding layer based on the two-dimensional equivalent magnetic field model of the superconducting cable and the structural parameters, the magnetic conductivity and the conductivity of the superconducting cable; calculating transmission current of the conductive layer and the shielding layer based on the equivalent circuit model of the superconducting cable and the resistance of the superconducting cable; and calculating the sequence parameters of the superconducting cable transmission line by coupling the induction electric field and the induction current density vector of the shielding layer and the transmission current of the conducting layer and the shielding layer. The analysis method for calculating the parameters of the cold insulation superconducting power transmission line has important theoretical value and practical significance.

Description

technical field [0001] The invention belongs to the field of superconducting cable power transmission, and in particular relates to a method, system, equipment and medium for calculating sequence parameters of superconducting cable power transmission lines. Background technique [0002] Superconducting cables have the characteristics of low loss, compactness and large capacity, and are a potential transformative technology for power grids. A large number of basic researches and grid-connected test demonstrations have been carried out at home and abroad. In 2000, the US Southern Line Company was connected to the grid and operated the world's first 30m-long, 12.5kV / 1.25kA three-phase cold-insulated high-temperature superconducting cable. cable. At present, dozens of demonstration projects have been intensively carried out in Europe, the United States, Japan and South Korea to systematically verify the technical performance of superconducting cables. In China, in 2003, Inner ...

AI Technical Summary

Problems solved by technology

First, under asymmetrical faults inside and outside the line, the sum of the transmitted three-phase currents is not zero, so the shielding current into the ground is not zero, such as figure 1 As shown, this will change the zero-sequence current of the grid system

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