Permeance Based Modeling of Magnetic Hysteresis with Inclusion of Eddy Current Effect

Magnetic hysteresis together with eddy current effects are typically present in metal based core materials and contribute significantly to the nonlinearity and power loss of the magnetic components operating in power electronic converters. In order to investigate their influence on the system’s behavior in time domain, model which is accurate and simple enough to be integrated into circuit simulation environment, is desired. This work proposes a modeling’s approach using permeance-capacitance based magnetic circuit, which combines the hysteresis and eddy current effect of the magnetic components in system-level time domain simulation

Leakage Flux Modeling of Multi-Winding Transformers for System-Level Simulations

In multiwinding transformers, different geometry of the individual windings leads to unbalanced leakage flux paths. The unbalance affects the behavior of the power electronic converters, where these transformers are used. This paper proposes an approach to model the leakage flux path of transformer with repetitive multiwinding structure using permeance magnetic circuit. The model is composed of lumped components, it can be seamlessly integrated into system-level simulation of power electronic circuits and achieve good accuracy in time-domain simulation. Taking advantage of the repetitive structure, the model requires very limited number of parameters, which can be easily obtained from the geometry information together with only a few experimental tests. The fidelity of the model is experimentally confirmed on a multiwinding transformer prototype connected to power electronic devices

Leakage Flux Modelling of Multi-Winding Transformer using Permeance Magnetic Circuit

The size and position difference of the windings determine the leakage flux path and give rise to unbalance of the short-circuit impedances, which strongly affects the transient behaviour of the transformer. This work proposes a new approach of modelling with magnetic equivalent circuit, making use of the transformer geometry and permeance magnetic equivalent circuit, which is suitable for system-level simulation in terms of complexity. Equivalent model requires limited number of parameters and for verification purposes, FEM simulations as well as measurement on the experimental prototype have been performed

Test Setup for Characterisation of Biased Magnetic Hysteresis Loops in Power Electronic Applications

Hysteresis effect of core materials contributes sig- nificantly to the power loss and nonlinearity of the transformers and filter inductors in power electronic applications. For design or modeling of the magnetic components, information of the magnetic material’s characteristic under the desired operation condition is usually required. In many common types of power converters the magnetic components undertake biased excitation, which leads to hysteresis loop with DC-offset on both magnetic field strength and flux density. This work proposes a test setup combining both linear amplifier and switching cells, which is able to conveniently generate magnetic hysteresis loops at arbitrary biased levels