Resistive-type superconducting fault current limiter digital modeling and simulation method based on YBCO superconducting tape

Abstract

The invention relates to a resistive-type superconducting fault current limiter digital modeling and simulation method based on a YBCO superconducting tape. On the basis of establishing a YBCO superconducting tape equivalent structure model, a YBCO superconducting tape equivalent circuit model, a YBCO superconducting tape thermal conduction model and a resistive-type superconducting fault current limiter circuit model, the line current and the superconducting tape current are calculated according to given circuit parameters of the current limiter, and structure parameters and initial operation conditions of the superconducting tape; the temperature of the superconducting tape is calculated according to the YBCO superconducting tape thermal conduction model; the resistance of the superconducting tape is calculated according to the YBCO superconducting tape equivalent circuit model, the temperature of the superconducting tape, and the superconducting tape current; and the line current and the superconducting tape current are calculated according to the resistive-type superconducting fault current limiter circuit model, and simulating calculation of the resistive-type superconducting fault current limiter is achieved. The resistive-type superconducting fault current limiter digital modeling and simulation method based on the YBCO superconducting tape can be used for superconducting fault 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...

AI Technical Summary

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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