Abstract: To investigate the impact of grounding configurations for the shielding layer of secondary cables in Ultra-High Voltage (UHV) converter stations on transient disturbance voltages, this paper establishes an electromagnetic transient simulation model of the converter station, incorporating the valve hall, grounding grid, and connecting cables. By conducting a comparative analysis of the transient disturbance voltage characteristics under diverse grounding configurations, such as single-ended, double-ended, multi-point, and armor layer-assisted grounding, this study elucidates the suppression mechanisms of these grounding methods on electric and magnetic field coupling. The research findings demonstrate that double-ended grounding of the shielding layer can diminish transient disturbance voltages to 15% to 30% of those under single-ended grounding, and the integration of armor layer-assisted grounding can further reduce them by an additional 20% to 35%. For control cables exceeding 200 meters in length, a multi-point grounding strategy combining "two-end grounding with an intermediate point grounding" is recommended. The grounding optimization strategy proposed in this paper provides a theoretical basis for the electromagnetic compatibility design of the secondary system in UHV converter stations.