Process for controlling isolated microgrids based on power-based control and modified Volt-VAr function methods

A process for controlling isolated microgrids based on Power-Based Control (PBC) method and modified Volt-Var function method, the process comprising:

• a) identifying, for a microgrid to be controlled, a range of power factor (PF) values between a minimum value (PF*min) and a maximum value (PF*max);
• b) in steady state:
• applying the PBC method via a central controller (CC);
• and
• defining PF references to be used for generators for the maximum value (PF*max) to control frequency inverters to inject a reactive power calculated via the CC using the PBC method;
• c) before a transitional regime starts:
• changing the PF references to be used for the generators to the minimum value (PF*min);
• and
• programming the frequency inverters to use a unitary PF as a reference such that the frequency inverters include an increase in availability of reactive power exchange with the microgrid within a technically specified limit of the frequency inverters;
• d) during the transitional regime:
• suspend the CC from applying the PBC method;
• and
• start the frequency inverters to define the reactive power exchanged with the microgrid based at least in part on a voltage measured at a connection point of the frequency inverters using a modified Volt-Var curve;
• e) after the transitional regime:
• resuming the PBC method via the CC;
• returning the PF references to be used for the generators to the maximum value (PF*max);
• and
• injecting, by the frequency inverters, the calculated reactive power.