Three-phase voltage-mode PWM converter is the main interface device between distributed renewable energy generation unit and traditional distribution network. In the main circuit design of PWM converter, using LCL filter to replace the traditional L filter has been widely accepted. In view of three-phase voltage-mode PWM converter with LCL filter, on the basis of input and output model and system transfer function, a novel LCL filter optimal design method is proposed. Comparing with the traditional L filter, the novel method has advantages on smaller total inductance, better dynamic performance and lower system cost. In order to prevent the inherent resonance of LCL filter, it increases a notch filter in current loop to achieve active damping of LCL filter in synchronous rotating coordinate system. The experimental results verify the correctness and effectiveness of the proposed method. This work is supported by 2016 Science and Technology Key Research Project of Henan Science and Technology Agency (No. 162102210298), 2015 Science and Technology Key Research Project of Henan Science and Technology Agency (No. 152102210342), 2016 Key Science and Technology Research Project of Henan Higher Institution (No. 16A470024), 2015 Key Science and Technology Research Project of Henan Higher Institution (No. 15A470022), and 2016 Science and Technology Development Planning Project of Xuchang City.