Context:

An inverter-based microgrid working in islanded mode can suffer cyber-attacks, these can be done against either the local controller or the communication links among the inverters. Secondary control is able to reject those attacks, however, a tertiary control action is necessary in order to stabilize the power flow among the microgrid.

Method:

Confidence factor technique allows to reject attacks in a microgrid acting directly over the secondary control, however, this technique omits other factor related to the power available. In this case, secondary control was complemented with a tertiary control that includes optimization criteria.

Results:

An inverter-based microgrid is simulated in Matlab for different scenarios and under cyber- attack, this allows checking the correct response of the controller under attacks and the effective power- sharing among inverters.

Conclusions:

The tertiary control allows stabilizing the active power of the system after the rejection of a cyber-attack by the secondary control. Each inverter supplies active power according to its maximum power rating without affecting the stability of the whole system.

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