Abstract: To address the challenges of high total harmonic distortion(THD) and significant three-phase current fluctuations in current grid-connected harmonic suppression methods for power generation units, this study investigates harmonic suppression strategies for doubly-fed wind turbine generators. A steady-state model of doubly-fed induction generators was established to analyze the impact of harmonics on motor operation. The model identified harmonic sources in grid-connected converters, enabling harmonic component elimination through harmonic disturbance compensators. Concurrently, the controller adjusted inverter output currents to reduce power system harmonic interference, achieving effective harmonic suppression. Experimental results demonstrated smoother grid-connected current waveforms with reduced THD, resulting in optimized output performance. Three-phase currents exhibited stable fluctuations with significantly reduced variation ranges, complete elimination of current distortion, and waveform restoration approaching ideal conditions. These findings confirm that the proposed method effectively suppresses seventh-order harmonics during grid connection, demonstrating superior harmonic suppression efficacy.