Concise Grid-Fault Current Expression for Doubly Fed Induction Generator Under Uninterrupted Control

Abstract

Numerous methods have been developed to derive the stator short-circuit current expression for DFIG, resulting in a variety of forms of current expressions. These expressions are too complex in form to facilitate further development and utilization, without considering the role of power grids. In addition, the relationship between different expressions is not clear, which is not conducive for engineers to make selective research. Therefore, this paper conducts a detailed analysis of the stator short-circuit current based on the proposed rotor equivalent circuit, which derives a concise expression for the stator short-circuit current. The expression considers the effects of the control parameter and power grids. Moreover, this paper reveals the interrelationships between three types of current expressions. The validity of the proposed concise short-circuit current expression is verified by a grid-connected DFIG simulation model built in PSCAD/EMTDC. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.