System and Method for Operating a Doubly Fed Induction Generator System to Reduce Harmonics

A method for operating a doubly fed induction generator (DFIG) power system connected to a power grid, the DFIG power system defining a generator power path and a converter power path, the generator power path having a DFIG with a rotor and a stator, the converter power path having a power converter with a rotor-side converter coupled to a line-side converter via a DC link, the power converter having at least two power bridge circuits connected in parallel, the method comprising:

• monitoring, via one or more sensors, a frequency of the rotor of the generator of the DFIG power system;
• comparing, via a control system, the frequency of the rotor to a predetermined threshold, the predetermined threshold being indicative of an occurrence of a transient overloading event;
• and,
• dynamically alternating between non-interleaving and interleaving patterns for the at least two power bridge circuits when the frequency exceeds the predetermined threshold so as to reduce harmonics of the DFIG power system.