Aiming　at　the　problems　that　traditional　algorithm　has　slow　convergence　rate　and　that　the　adaptive　method　with　LPF　has　the　drawback　of　slow　dynamic　response,　an　improved　adaptive　method　for　harmonic　detecting　based　on　integrated　mean　value　is　researched　in　this　paper.　Instead　of　the　traditional　LPF　method,　the　moving　average　method　is　used　to　obtain　the　DC　components　by　calculating　the　mean　value　of　fundamental　currents.　And　a　Dual-Buck　inverter　circuit　with　a　hysteresis　current　control　method　is　presented　in　this　paper.　The　simulation　results　show　that　a　rapid　transient　response　can　be　obtained　under　the　improved　method,　and　the　compensation　effects　of　APFs　can　meet　the　requirements　of　National　Standard　GB/T　14549-93　and　IEC　-61000-3-2A..　The　method　is　suitable　for　the　harmonics　compensation　when　the　supply　voltages　are　of　distortion.　©2010　IEEE.