Transient and islanding performance of grid-connected induction generator feeding induction motor and resistive loads

This paper presents transient and islanding time-domain simulation of grid-connected induction generator feeding induction motor and resistive loads. The behavior of the system following a three-phase short-circuit in the grid network is investigated. Also the behavior of the system when it is suddenly disconnected from the grid is investigated under various loading conditions. Reactive power requirements of the induction generator and motor are supplied by the grid in addition to a local capacitor bank. Transient performance of the system due to a balanced three-phase short-circuit in the grid network is investigated. It is found that there is a critical clearing time for the system to maintain stability. Islanding (disconnection from the grid) performance of the system is also investigated. It is found that islanding may cause overvoltage and stability problems, depending on the active and reactive power deficit caused by disconnection from the grid.