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This paper describes how harmonics up to some hundreds of Hz propagate from stator to rotor and vice versa in a doubly fed induction generator of a wind energy converter. Some of these harmonics are impressed by the grid, some are created by asymmetries of its voltages and currents; others originate in the wind turbine. At a test bench measurements have been made to investigate harmonics for one sub-synchronous and one super-synchronous operating point. The results show, how sources of harmonics in the generator can be identified and offer possibilities to compensate certain stator harmonics with the rotor side converter.
Schostan et al. (Fri,) studied this question.