Method for calculating magnetic shielding frame magnetic loss under alternating-current/direct-current hybrid excitation

Abstract

The invention discloses a method for calculating magnetic shielding frame magnetic loss under alternating-current / direct-current hybrid excitation. Under the alternating-current / direct-current hybrid excitation, the method includes: performing simulation on a smoothing reactor model by adopting a transient field and dividing a magnetic shielding frame model into multiple equivalent uniform domains according to the principle of approximately-equal magnetic flux density Bm distribution; calculating all average magnetic field intensities H in one period of the equivalent uniform domains through MagNet software; further calculating direct-current offset magnetic field intensity Hdc in the equivalent uniform domains; reestablishing the smoothing reactor model according to the divided equivalent uniform domains, giving Bm-P loss characteristic curves of the equivalent uniform domains under the corresponding direct-current offset magnetic field intensity Hdc; performing three-dimensional finite element transient simulation on the smoothing reactor model subjected to remodeling; finally calculating magnetic loss of the equivalent uniform domains, and carrying out algebraic addition on magnetic loss of the equivalent uniform domains to acquire the magnetic loss of a magnetic shielding frame. Through the use of the method, calculating amount of work and calculating time are reduced.

Description

technical field

[0001] The invention relates to the field of electromagnetism, in particular to a method for measuring and calculating the magnetic loss of a magnetic shielding frame under mixed excitation of AC and DC. Background technique

[0002] At present, under the condition of AC and DC mixed excitation, the analysis and verification of the loss in the structural parts of large electromagnetic devices and how to effectively reduce the loss have attracted much attention in product analysis and design. With the full development of high-voltage direct current transmission project construction, many direct current transmission equipment have been developed rapidly, among which smoothing reactor is one of the main equipment. Smoothing reactors often operate under mixed excitation of AC and DC, so that the windings of the smoothing reactor not only contain a large DC component, but also contain high-order harmonic AC components, plus the outer core structure of the smoothin...

Images