<p>The Vienna rectifier, a three-phase, three-level AC/DC converter, is widely employed in high-power applications such as uninterruptible power supplies (UPS), electric vehicle chargers, and communication systems due to its advantages of low total harmonic distortion (THD), reduced voltage stress, and compact input inductor design. However, at low output power, the current controller transitions from continuous conduction mode (CCM) to discontinuous conduction mode (DCM), resulting in significant changes to the plant characteristics and compromising control stability. To address the challenges associated with light-load DCM operation, this paper proposes a novel compensation technique based on the input current reference. The proposed method employs the input current reference, which is proportional to the output power, to inject an offset voltage, thereby maintaining low THD and ensuring stable control of both the output voltage and input current under light-load conditions. Moreover, a proportional–resonant (PR) controller is adopted, eliminating the need for complex DQ transformation, which simplifies controller implementation and reduces computational burden. The ability to independently control each phase also enhances robustness under three-phase unbalanced conditions. The effectiveness of the proposed control strategy is validated through simulation and experimental results on a 30&#xa0;kW Vienna rectifier system, demonstrating substantial improvements in input current quality and system stability across the entire load range.</p>