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This paper presents an analytical model of air gapped inductor considering the nonlinear magnetic behavior of the core along with temperature variation. First, a nonlinear magnetic behavior is represented by a mathematical function, which contains three coefficients and defines magnetic flux density (B) as a function of magnetic field strength (H). Using Matlab curve fitting toolbox, these coefficients...
This paper presents a new lumped parameter method (LPM) to capture nonlinear magnetic behavior of interior permanent magnet synchronous machines (IPMSM). Firstly, the nonlinear B-H curve is modeled as a mathematical expression using Matlab curve fitting toolbox. Using the geometry of the machine, the flux density B versus magnetic field intensity relation is transformed to flux versus MMF relation...
The purpose of this paper is to introduce a novel approach for modeling and studying an internal short circuit for interior permanent magnet machines. It is first necessary to develop an understanding of how the flux linkage in the machine behaves under an internal short circuit. This will enable the model of the machine to be developed into two parts. The first part corresponds to the expected model...
This paper presents detailed analysis of doubly fed induction generator (DFIG) wind turbine electrical components during normal and unbalanced fault condition. Wind turbine components are individually modeled and then combined in a simulation process which is called coupled simulation. The coupled simulation results show that grid frequency oscillation occurs on q and d axis currents under one phase-ground...
This paper presents performance of doubly-fed induction generator (DFIG) based wind turbine under grid fault. All system is designed in Matlab/SIMULINK. DFIG and drive train model created in mathematical domain, whereas semiconductor switches, filters, transmission line and transformers are created with available models in Matlab/Simulink/SimPowerSystems toolbox. Saturable transformer model is used...
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