Abstract: To improve energy utilization efficiency, modern ships are often equipped with shaft-driven permanent magnet generators. When two permanent magnet generators are driven at the free end of the main engine through highly elastic couplings and supply power in parallel via rectification-inversion devices, the torsional vibration of the shaft system becomes particularly complex. To tackle this issue, this paper presents a suppression scheme for shaft-system torsional vibration. By analyzing the mechanism through which shaft-system torsional vibration affects the stability and reliability of power generation equipment as well as the safe operation of the power system, it reveals that torsional vibration may cause equipment damage and increase operation and maintenance costs. Meanwhile, the effectiveness of torsional vibration suppression methods in improving system operating performance is verified. This research possesses important engineering value for enhancing ship energy utilization efficiency and ensuring the safe and stable operation of ship power systems.