Equivalent modeling method of induction motor contribution to short-circuit current

Abstract

When a short-circuit fault occurs in the power grid, induction motors in the distribution network will contribute to the short-circuit current. Accurate short-circuit current calculation of the motors requires detailed modeling of distribution network. This method is not suitable for large-scale power grid. In this paper, an equivalent modeling method of induction motor contribution to short-circuit current is proposed, which is suitable for large-scale grid calculation and without changing the basic algorithm of short-circuit current or the basic data structure of electromechanical transient. An example of Central China Power Grid is shown, and the accuracy of the proposed method is verified by actual fault inversion.

Keywords

• Induction motor
• Short-circuit current
• Equivalent modeling