Abstract: The the characteristics of instance output power of photovoltaic inverters is analyzed under unbalanced grid faults and the power control algorithm of photovoltaic generation is put forward based on the derivation of total harmonic distortion of instruction current. The optimal parameters model of photovoltaic generation is then established with minimum integrated fluctuation amplitude of the active and reactive power as a goal when the restriction of output current harmonic distortion of photovoltaic inverters is taken into account. Finally, the overall model of photovoltaic generation system based on deadbeat current tracking is realized and the feasibility of proposed control strategy is verified with PSCAD/EMTDC simulation software.