On the Use of the General Purpose Code Ansys to Solve Electric and Magnetic Coupled Problems Under Nonlinear Conditions
This work describes a field-circuit method to solve non-linear massive conductor systems with a coupled method. The approach developed by authors has been studied in such a manner to permit industrial designers to front most common problems, involving saturable massive conductor lines, without using specialised numeric codes. In order to verify the capability of the power grid to supply non-linear devices (e.g., a spot-welding machine), having characteristics rapidly and greatly variable in time, we have developed a numerical method to evaluate the effects due both to transverse electric and magnetic fields in the network multiphase lines. We have approached this problem defining an equivalent circuit for saturable lines. All parameters have been fixed by means of a 2D finite element analysis (FEA). The coupled problem is solved by means of an iterative procedure, where general purpose FEA code and network solvers can be used. In this very simple form the model is able to simulate short lines, where propagation effects can be neglected without problems. For more complex situations, the line can be divided in short tracts and everyone of these can be represented using this model.
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