Improved gyrator–capacitor model considering eddy current and excess losses based on loss separation method

Abstract

The traditional equivalent circuit model based on the reluctance–resistance analogy method is used to model electromagnetic equipment in power systems. However, this model has unreasonable analogy, incomplete magnetic circuit information, and is difficulty to expand. This study proposes an improved gyrator–capacitor (G–C) model and its parameter extraction method for the modeling of electromagnetic devices in power systems. An improved G–C model considering eddy current and excess losses is proposed on the basis of the loss separation method and by utilizing the physical concept of resistance. On the basis of the proposed model, simple calculation methods of the instantaneous loss power and density of the core are presented. A parameter extraction method considering the fitting effect of the entire hysteresis loop and special points is proposed in accordance with the idea of curve fitting. The proposed model and its parameter extraction method are verified by comparing the calculated results with the measured results.