A new VBR modeling of squirrel-cage induction machine for power system analysis with XTAP

Abstract

Owing to the recent requirement for smart grids, the efficient utilization of electric power including motor control with power electronics apparatus has become important. To verify control effect under conditions similar to those of a real power system, electromagnetic transient (EMT) analysis software is very useful. In the EMT analysis of power systems, the modeling method used for rotating machines has a large impact on the accuracy and efficiency of the analysis. In this paper, a new squirrel-cage induction machine model for XTAP as a voltage source behind the primary winding leakage reactance (VBR) model is proposed. The noteworthy feature of the method is the calculation procedure using a two-stage diagonally implicit Runge-Kutta (2S-DIRK) method, second-order Runge-Kutta method (RK2), and αβ and dq transformations without any prediction. This approach is considered to enhance the numerical stability of transient analyses including those of rotating machines by explicitly limiting the calculation errors through the use of RK2.