System and method for reducing voltage distortion from an inverter-based resource

A power system connected to a power grid, the power system comprising:

• a dual-fed asynchronous generator (DFAG) comprising a rotor and a stator;
• a power converter;
• and,
• a controller for controlling the power system, the controller configured to perform a plurality of operations, the plurality of operations comprising:
• receiving one or more voltage feedback signals created by at least one component of the power system;
• extracting a distortion component of the one or more voltage feedback signals having a certain phase sequence and frequency by:
• determining an angle representing a time-varying angular position of the certain phase sequence and frequency associated with the distortion component;
• and
• rotating the one or more voltage feedback signals from a first reference frame by the angle to obtain a signal wherein a steady component of the signal represents vector components of the distortion component;
• wherein the distortion component comprises any component of the one or more voltage feedback signals that is different from a positive-sequence, fundamental-frequency component of the one or more voltage feedback signals;
• determining a voltage command for the power converter as a function of, at least, the distortion component;
• and,
• controlling the power converter based on the voltage command such that voltage distortion created by the at least one component of the DFAG is reduced in a manner that is relatively insensitive to voltage distortion created by sources external to the DFAG.