PMFCL (permanent-magnet-biased fault current limiter) magnetic current thermal coupling modeling method

Abstract

The invention discloses a PMFCL (permanent-magnet-biased fault current limiter) magnetic current thermal coupling modeling method. The PMFCL magnetic current thermal coupling modeling method includes establishing a 2D model of a half-wave current-limiting topological structure of the PMFCL; employing finite element software Ansoft to simulate the model; establishing a 3D model of the half-wave current-limiting topological structure of the PMFCL by the aid of the Ansoft; establishing a transient thermal analysis model in the ANSYS, subjecting the transient thermal analysis model to finite element mesh generation and subjecting a temperature field to graph mapping to the 3D model of the half-wave current-limiting topological structure of the PMFCL, and accordingly obtaining a temperature field calculation result of a PMFCL device at any moments. According to the arrangement, electromagnetic fields and current vectors of a winding and components of a linear PMFCL are analyzed and calculated with thermal fields to obtain magnetic-current-thermal coupling analysis, accordingly imparting a significant reference for material types and parameter designs of the PMFCL.

Description

technical field [0001] The invention belongs to the field of power system fault current limiting, in particular to a magnetic current thermal coupling modeling method for a permanent magnet saturation fault current limiter. Background technique [0002] With the increasing scale of my country's power grid, the rapid growth of power system load, the continuous operation of large-capacity units, and the interconnection of power grids in various regions, the level of short-circuit in the power system is increasing day by day. The current level has approached or even exceeded the maximum allowable level stipulated by the electric power regulations. Excessive short-circuit current will not only cause the voltage and frequency instability of the power system, but also produce strong thermal effects and electrodynamic shocks, which will damage electrical equipment and its insulation. Furthermore, problems such as step voltage and electromagnetic interference to communication equipm...

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Problems solved by technology

This hybrid magnetic circuit structure leads to more complex magnetic leakage components, mainly including the leakage magnetic field between the permanent magnet and the surface of the iron core, the leakage magnetic field between turns of the winding, and the leakage magnetic field at the corner or joint of the iron core. When the system is short-circuited, the leakage magnetic field Distortion will occur. In order to analyze the magnetic efficiency of the current limiter more effectively, it is necessary to establish a reliable magnetic flux leakage analysis model based on experimental research.

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