Stability analysis in an inverter-dominant microgrid facing in-rush current of an induction machine

In islanding operation with high shares of renewables, transient disturbances may put the system in danger of instability. In such a situation, the frequency-voltage profile of the remaining power system, does not only depend on the depth of the unbalance, which appears following a transient, but also to the percentage of renewables and their control topologies as well as the dominant load on the islanded area. Hence in this paper, the renewables are controlled to act as a grid-supporting current and voltage sources. Also the load characteristic is varying from dominant resistive, to dominant induction machine and converter- fed loads. The emergency measures for under- and over-frequency and voltage control is also considered the same in all simulation scenarios. The simulations are carried out in Matlab-Simulink via different scenarios to find out if the islanded power system and the generation units in that area are able to handle such a transient event considering different criteria via the emergency measures in the islanded power system.