Modeling method for broadband circuit model of silicon steel sheet iron core

Abstract

The invention relates to the field of component simulation modeling for power electronics and power systems, in particular to a modeling method of a broadband circuit model of a silicon steel sheet iron core. According to the method, after reasonable subdivision is conducted on each layer of silicon steel sheets, the iron core is equalized into a trapezoidal circuit on the basis of an equivalent circuit method, the circuit can be connected with an external circuit according to certain rules, and therefore a whole system is analyzed and calculated; according to the penetration depth of electromagnetic waves in the iron core under normal working conditions, each silicon steel sheet in the iron core is divided into three layers to determine the order of the iron core circuit model, the equivalent eddy current resistance Rek and nonlinear inductance Ldk of each layer of the layered silicon steel sheets are calculated, a passive two-port transmission network is defined and used for converting the physical quantity of the external circuit side of the iron core to that of the equivalent network side of a single silicon steel sheet, and finally the multi-iron-core model connected with theexternal circuit is established. According to the modeling method of the broadband circuit model of the silicon steel sheet iron core, the equivalent circuit method is adopted, the non-uniformity of the magnetic field distribution inside the iron core is taken into account, the equivalent model of the iron core is established, and therefore complex electromagnetic field calculation can be converted into simple circuit calculation.

Description

technical field [0001] The invention relates to the field of component simulation modeling of power electronics and power systems, in particular to a modeling method of a silicon steel sheet iron core broadband circuit model. Background technique [0002] With the rapid development of modern power electronics technology, silicon steel sheet iron core has been widely used in electrical equipment (transformers, reactors, inductors, etc.). When performing system analysis, it is necessary to accurately model this type of electrical equipment. As the core component of electromagnetic conversion, the accuracy of the broadband model is particularly important. However, due to the nonlinearity of the ferromagnetic material, the iron core is saturated, and the skin effect at high frequencies causes the uneven distribution of the magnetic flux in the iron core, which makes the wide-frequency modeling of the silicon steel sheet iron core difficult and complicated. [0003] At present, ...

AI Technical Summary

Problems solved by technology

The traditional analytical method needs to solve Maxwell's equations, the calculation process is cumbersome, and it is mainly used in theoretical analysis at present

The finite element method divides the calculation space into finite units, so that the solution of the differential equation of the electromagnetic field is transformed into the solution of the algebraic equation. Each silicon steel sheet in the iron core must be meshed, so that the number of cells is huge, and the simulation time too long

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