System and method for operating an inverter-based resource in grid-forming mode (GFM) for enhanced stability

A renewable energy source connected to a power grid, comprising:

• an inverter-base resource (IBR) system;
• a controller for controlling the IBR system, the controller comprising a processor configured to perform a plurality of operations, the plurality of operations comprising:
• operating the IBR system as a virtual synchronous machine (VSM) in grid-forming mode (GFM) control;
• deriving a power error signal (PERR) between an actual real power output (Pfbk) from the IBR system and a power reference (Pref) representing a desired power output of the IBR system;
• with an inertial power regulator, using the power error signal (PERR) to generate a power angle command signal received by a voltage regulator;
• with the voltage regulator, generating an x-direction current command (IRCmdx) signal and a y-direction current command (IRCmdy) signal that are both received by a current regulator;
• and
• generating and adding a delta x-direction current (ΔIRx) component to the (IRCmdx) signal, thereby providing an additional means of tuning the active power response.