A LCL parameters design method of photovoltaic (PV) grid-connected system with active power filter (APF) function is proposed, and factors such as active fundamental wave injection, slew rate of compensation current, switching harmonic and the bandwidth are considered for the system. The power quality and equipment utilization are improved, and better switching harmonic and grid current ripple suppression effect are obtained. Finally the validlty and feasitility of the design method is verified by the simulation.% 结合LCL滤波器与具有有源滤波功能的光伏并网系统，从有功基波注入、谐波电流变化率、开关次谐波及电流闭环控制器带宽等方面进行分析设计，提出了一种适用于具有有源滤波功能的光伏并网系统的LCL滤波器参数设计方法。该系统不仅改善了电网的电能质量、提高了设备的利用率，同时取得了更好的高频谐波及并网电流纹波抑制效果。最后通过实时仿真验证了设计方法的有效性与可行性。
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