An induction motor model for transient simulation

Demand of electromagnetic transient simulations is increasing, since fault-current analysis and power-quality simulations involving power-electronics converters are required for modern power systems. Among various loads, induction motors are typical rotating loads. The induction motor model available in EMTP uses a predictor-corrector interior point method for connecting the model to the rest of the power system. However, it takes a long calculation time in the case of a large-scale power system due to the complicated algorithm. This paper proposes an induction motor model which uses a simple feedback algorithm to identify the phase angle of the motor terminal voltages so that the proposed model can be connected to the rest of the power system in a much simpler way. The proposed induction motor model itself is a typical dq-frame model. The model is validated by comparison with experimental results, with the simulation scenarios of a star delta start up and a 3LG-O fault with large slip changes.