In view of such problem as slow dynamic response when the traditional closed-loop control faces the nonlinear shock load harmonic source

a kind of improved fast harmonic current control strategy is proposed.In this method

the inherent defect of slow response speed of traditional closed-loop control is made up by way of embedding current prediction-based deadbeat controller in the proportional resonant（PR） control with combination of the advantage of deadbeat control and proportional resonance control so to achieve fast and accurate tracking of harmonic current.In this paper

the continuous-time mathematical model of the three-phase three-wire active power filter is introduced firstly and the corresponding discretization mathematical model is derived by the backward difference method so to obtain current prediction control algorithm for the feedforward.On that basis

the design process of fast harmonic current composite control based on the feedforward control of deadbeat control is analyzed.Finally

the proposed control strategy is analyzed based on the Matlab/Simulink

and the effectiveness and superiority of the proposed method are verified.