Modeling method for nonlinear analysis of high-temperature superconducting magnet

Abstract

The invention provides a modeling method for nonlinear analysis of a high-temperature superconducting magnet. The method comprises the steps of building a PDE model for an electromagnetic thermal coupling analysis according to an actual magnet model; calculating dynamic inductance and resistance equivalent parameters according to a solving result of the PDE model; obtaining key parameters such as a critical current, a maximum temperature rise and the like of the superconducting magnet; and according to a mathematic relationship between the inductance and resistance parameters and a voltage drop at two ends of the magnet, performing equivalent processing on the magnet model by utilizing a controlled current source, wherein at any moment in simulation, the equivalent inductance, the equivalent resistance and the key parameters of the magnet are all related to a current state of the magnet, and a nonlinear E-J characteristic of the superconducting magnet is fully considered. According to the modeling method, mutual influence of a system control module and the superconducting magnet can be reflected, so that the influence of a control algorithm on a response characteristic of the superconducting magnet is analyzed. Compared with a conventional method for making the superconducting magnet equivalent to pure inductance, the modeling method has the characteristic of higher precision; the modeling process is not complex; excessive parameters are not introduced; and a state of the superconducting magnet can be monitored in real time.

Description

technical field [0001] The invention belongs to the technology of high-temperature superconducting magnets, and in particular relates to a modeling method for nonlinear analysis of high-temperature superconducting magnets. Background technique [0002] With the increase of the capacity of the power system, the complexity of the system structure, and the improvement of power users' requirements for power supply quality, the power system has highlighted several technical problems in terms of power safety, high-quality power supply, and high-efficiency power transmission. Superconducting power technology is a forward-looking technology that has attracted widespread attention at home and abroad. The introduction of it into the power system will provide a new technical approach to solve the inherent technical problems of the power system. At present, superconducting power technology has entered a period of rapid development. Some superconducting power products, especially high-te...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-temperature superconducting magnet nonlinear analysis modeling method, aiming to solve the problem that the existing superconducting magnet is simply equivalent to a pure inductance element in system analysis, ignoring its inductance and resistance nonlinear characteristics. To solve the technical problem of inaccurate response characteristics of superconducting magnets, analyze the overall external characteristics of superconducting magnets in the system, obtain key parameters such as inductance changes, equivalent resistance changes, magnetic density distributions, and temperature rises in the dynamic process, and focus on their non-conductive The influence of linear characteristics on the system to provide a reference for correction of traditional superconducting magnet design

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