ABSTRACT
Generally, turbine generators play an important role in network operation, but for a variety of reasons, generators carry three-phase unbalanced load sometimes. Generator stator windings will produce a negative sequence current in asymmetric operation (Li, Sun & Yang 2005, Bach et al. 2009). Since the rotary magnetic field generated by the negative sequence current is rotating at the same speed, inverting with the rotor, thus, the negative sequence field will induce a series of harmonics in the rotor winding (Ge, Wu & Zhang 2013). With the motor industry development, this situation has become increasingly prominent and urgent.
