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

A technology of superconducting cables and transmission lines, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, impedance measurement, etc., can solve problems such as changing the zero-sequence current of the power grid system

Pending Publication Date: 2022-07-05

CHINA ELECTRIC POWER RES INST +2

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AI-Extracted 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 shi...

Method used

The positive-sequence impedance parameter of superconducting cable and the accuracy of zero-sequence impedance parameter are related to the safe and stable operation of power grid, and it is the work of calculating system short-circuit current, relay protection setting, power system power flow calculation and selecting reasonable operation mode According to the basis, the prese...

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.

Application Domain

Permeability measurementsImpedence measurements

Technology Topic

Electrically conductiveCable transmission +10

Image

Examples

Experimental program(1)

Example Embodiment

[0211] Example

[0212] Based on the method of the present invention, according to the parameters in Table 1 combined with the finite element analysis method and the circuit analysis method, the sequence parameters of the superconducting transmission line can be calculated and obtained, as shown in Table 2.

[0213] Table 1 Structural parameters and electrical properties of superconducting cables

[0214]

[0215]

[0216] When the value of the shielding layer resistance is 0, the sequence parameters of the superconducting transmission line are obtained, and then the relationship between the positive sequence reactance of the cable and the shielding layer resistance is obtained by changing the value of the shielding layer resistance (such as Image 6 ) and the relationship between the zero-sequence reactance of the cable and the resistance of the shielding layer (such as Figure 7 ).

[0217] The accuracy of the positive-sequence impedance parameters and zero-sequence impedance parameters of superconducting cables is related to the safe and stable operation of the power grid, and is the basis for calculating the short-circuit current of the system, setting the relay protection, calculating the power flow of the power system and selecting a reasonable operation mode. The invention can provide an important basis for calculating the short-circuit current of the system, setting the relay protection, calculating the power flow of the power system and selecting a reasonable operation mode by calculating the positive sequence, negative sequence and zero sequence line parameters of the superconducting transmission line. value and practical significance.

[0218] As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

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Description & Claims & Application Information

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