Generalized state-space saturable induction machine model using a voltage-behind-reactance formulation

Modeling of induction machines (IMs) for power systems transient studies has been receiving significant attention in the literature, where a continuous effort is made to improve the accuracy and efficiency of common general-purpose models. Among recently proposed methods, a so-called voltage-behind-reactance (VBR) formulation has been shown to improve the interfacing of machine models with the external network. Depending on the rotor type and the required model fidelity, the rotor may be represented using one or two rotor equivalent windings. In this paper, we propose a new algebraically exact generalized IM model using the VBR formulation. The proposed full-order model incorporates two rotor windings and main flux saturation, whereas a simpler model with only one rotor winding can also be easily obtained. The validity of the new model is first verified by comparing it to a traditional (reference) model. The improved accuracy and computational efficiency of the proposed VBR model is then demonstrated when the IM is interfaced to an external inductive network.