Medium　voltage　three-level　wind　power　converter　is　a　good　choice　for　the　next　generation　10-MW　wind　turbine.　However,　since　switching　frequency　of　medium　voltage　semiconductor　device　is　strictly　limited,　harmonic　current　is　hard　to　depress,　especially　for　LCL　type　wind　power　converter.　This　paper　presents　an　effective　way　to　eliminate　resonance　current　under　low　switching　frequency.　Active　damping　strategy,　instead　of　passive　damping,　is　adopted　here.　Detailed　system　model　is　built,　which　shows　the　converter　harmonic　terminal　voltage,　generated　by　the　PWM　section,　introduces　considerable　the　resonance　harmonic　current.　To　guarantee　system　stability,　a　negative　proportion　gain　is　used　in　the　active　damping　feedback　loop.　According　to　the　system　model,　a　low　pass　filter　is　also　adopted　in　the　converter　current　feed-back　loop,　where　harmonic　current　depression　performance　is　greatly　improved.　Experimental　results　validate　the　theoretical　analysis.　©　2020　IEEE.