Electrical power system having active harmonic filter

An electrical power system connected to a power grid, comprising:

• a generator comprising a stator and a rotor, the stator connected to the power grid via a stator power path;
• a power converter comprising a line-side converter coupled to the power grid via a converter power path and a rotor-side converter coupled to a rotor bus of the rotor and the line-side converter via a DC link;
• an active harmonic filter coupled to the stator power path;
• and
• a controller comprising at least one processor, the at least one processor configured to perform a plurality of operations, the plurality of operations comprising:
• controlling the active harmonic filter to selectively extract a high frequency harmonic component from an output current of the electrical power system;
• determining whether the high frequency harmonic component is a positive sequence harmonic or a negative sequence harmonic;
• and
• compensating for the high frequency harmonic component based on whether the high frequency harmonic component is the positive sequence harmonic or the negative sequence harmonic to mitigate the high frequency harmonics in the output current,
• wherein compensating for the high frequency harmonic component based on whether the high frequency harmonic component is the positive sequence harmonic or the negative sequence harmonic further comprises:
• via a first control path, rotating the high frequency harmonic component to a d-q reference frame based on a first angular position;
• applying a proportional-integral regulator to the high frequency harmonic component in the d-q reference frame to obtain a compensated signal;
• rotating the compensated signal back to an a-b-c reference frame;
• via a second control path, generating, via a phase-locked loop of the controller, the first angular position for the d-q reference frame based on the high frequency harmonic component and a bias frequency input;
• generating a second angular position as a function of an input angle and the first angular position from the phase-locked loop;
• and
• applying the second angular position to the high frequency harmonic component of the first control path to determine a harmonic compensation signal that attenuates the high frequency harmonic component.