The growing number of electric vehicles (EVs) connected to the grid are a promising potential to support the overall system stability, known as vehicle to grid concept. During grid faults these vehicles can be seen as distributed dispatchable sources that can collaborate to the system restoration. In the case of islanded microgrids under a fault, electric vehicles can provide its stored energy in order to imitate the low voltage ride through protocols (LVRT) that are required to distributed generation systems connected to the main grid. The islanded microgrid tested here is composed of grid-forming voltage sources supplying different loads, some of them EVs. The proposal in this work is that, during a voltage sag caused by an overcurrent in the system, EVs must inject active power to support the voltage, instead of supplying reactive power as LVRT require. The theoretical reasoning of this new approach will be supported by a complete system modelling in the complex valued domain. Selected experimental results demonstrate the effectiveness of the control proposal.