Digital modeling and simulation method of resistive superconducting current limiter based on ybco superconducting strip

Abstract

A digital modeling and simulation method for resistive superconducting current limiter based on YBCO superconducting tape, in establishing the equivalent structure model of YBCO superconducting tape, the equivalent circuit model of YBCO superconducting tape, the heat conduction model of YBCO superconducting tape Based on the model and the circuit model of the resistive superconducting current limiter, the line current and the superconducting strip current are calculated according to the circuit parameters of the given current limiter, the structural parameters of the superconducting strip and the initial operating conditions; according to the YBCO superconducting The heat conduction model of the conductive strip calculates the temperature of the superconducting strip; calculates the resistance of the superconducting strip according to the equivalent circuit model of the YBCO superconducting strip, the temperature and current of the superconducting strip; calculates the resistance of the superconducting strip according to the resistive superconducting current limiter The circuit model is used to calculate the line current and superconducting strip current, and realize the simulation calculation of the resistive superconducting current limiter. The invention can be used for superconducting current limiters with multiple units and complex structures.

Description

technical field [0001] The invention relates to a digital modeling simulation method for a superconducting current limiter. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity continues to increase, which drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and industrial centers continue to increase, which makes the interconnection of power systems , the level of short-circuit current in the power grid at all levels is increasing continuously, and the destructiveness of short-circuit faults to the power system and its connected electrical equipment is also increasing. However, the transient stability of large power grids is more prominent, and one of the most important reasons is that conventional power technology lacks effective short-circuit fault current limiting technology. [0003] The resistive supe...

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Problems solved by technology

However, this digital modeling and simulation method simply divides the resistance of the YBCO superconducting strip in the superconducting state, the magnetic flux flow resistance state and the normal state, so that the modeling cannot be smooth during the transient process of fault current limitation. Transition often produces singular points, and the function cannot converge; at the same time, due to the large number of parameters, it brings great inconvenience to the analysis problem

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