A voltage-behind-reactance model and validation for six-phase synchronous machines

Abstract

The voltage-behind-reactance (VBR) model is used more and more in modeling and simulation of electrical machines due to its improved efficiency and flexibility. So far, the VBR model has been applied to represent the standard three-phase synchronous/induction machines only. It is necessary to extend the VBR model to include multiphase machines that are commonly used in aircraft, ships, and other applications. This paper presents the VBR model formulation for six-phase synchronous machines wherein the mutual leakage couplings between the two sets of three-phase stator windings and the cross-saturation of the magnetizing path in both of the d-q axes are considered. The stator windings of the proposed model are represented by inductive branches, which can be used in circuit simulation directly. The steady-state and transient performance of the model is then validated by two computer simulation cases against previously-validated models.

Condition-Monitoring System for Identification and Representation of the Capability Diagram Limits for Multiple Synchronous Generators in a Hydro Power-Plant

“…There are a lot of models of synchronous machines reported in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] that are based on the two-axis theory. All of those models were developed for a specific purpose or application and they have their advantages and disadvantages.…”

“…Dynamical models for synchronous machines can be divided on the models based on constant values in synchronous rotating d-q reference frame, on the models that take into account cross-saturation [2,3,[20][21][22][23][24], on the models that were developed in the abc reference frame [9,19]. A special part of the models in the abc reference frame represents the voltage behind reactance type of models [12][13][14][15][16][17][18][19] which are more appropriate for the modelling of the synchronous generators as a part of the power-system. Some models are purely mathematical (black box models) without the physical background [10,[25][26][27][28][29][30][31][32][33][34][35].…”