Journal article

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

In multi-winding transformers, different geometry of the individual windings leads to unbalanced leakage flux paths. The unbalance affects the behaviour of the power electronic converters, where these transformers are used. This work proposes an approach to model the leakage flux path of transformer with repetitive multi-winding 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 multi-winding transformer prototype connected to power electronic devices.

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