As the inevitable low-frequency input oscillation in the single-phase inverter, it always has the requirement for the active power decoupling. Passive solutions bring a significant increase in overall size. Besides, the existing active solutions have limitations as either adding a decoupling topology or strongly relying on their own original topology. Hence, in this paper, to overcome the drawbacks, a novel active method is proposed based on the LCL filter VSI by combining the characteristics of ac-side topology-type decoupling and control-type decoupling. The oscillation power is absorbed by the original filter capacitors. To explain the proposed approach and to demonstrate its effectiveness, theoretical power analysis, the control strategy, and simulation results are given. The proposed control strategy not only suppresses ripple, but also reduces the input voltage requirements. The results demonstrate the control is capable of suppressing the oscillation and realizing high-quality output.