System and method for operating an inverter-based resource in grid-forming mode (gfm) for enhanced stability during a transient grid power event

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 a 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 having an integral characteristic, using the power error signal (Perr) to generate an internal frequency signal (ω1), using the internal frequency signal (ω1) to generate a phase shift signal (δIT) applied to a power angle command signal used by an inverter controller in the IBR system;
• and
• generating, via a control function having at least one of a proportional, derivative, or washout characteristic, a compensation signal based on the power error signal (Perr) and applying the compensation signal to modify either the internal frequency signal (ω1) or the phase shift signal (δIT) thereby providing an additional mechanism of tuning the relationship between active power, frequency, and power angle.