Bearing electric erosion has consistently been a focal concern in the wind power industry. Currently, in the field of large-scale variable-frequency power generation, it is difficult to identify the initial stage of bearing electric erosion due to the combined effects of load, bearing preload, voltage, current, frequency, rotational speed, and lubricating grease. Owing to the complexity of vibration in large machines, bearing electrical erosion often remains undetected until the vibration level exceeds a predetermined threshold, unless dedicated bearing disassembly and inspection are performed. Due to the structural particularity of medium-speed permanent magnet drivetrains and the long maintenance cycles of large offshore wind turbines, conventional motor-based or generator-based methods cannot be fully applied. Indiscriminate application may prove counterproductive. Based on a 16000 kW full-power wind generation system, this paper elaborates the mechanisms, implementability and maintainability of various suppression solutions. Through comparative experiments, practical solutions for suppressing bearing electric erosion are formulated and implemented.