Abstract: This paper proposes a design method for an LCL filter in grid-side PWM rectifier, then it is modeled. The research in single-phase model transfer function of LCL filter is made to obtain the relation between resonance frequency, harmonic current amplitude attenuation factor and factor r—the ratio between grid-side and rectifier-side inductance. The total inductance, capacitance of filter and r can be selected by analyzing the change tendency of the variable relation figures. The analysis results indicate that the lower limit of the total inductance and capacitance of filter are determined by resonance frequency. Finally, a designed example is reported, and the validity of this method is tested by simulation.

Key words: PWM rectifier, LCL filter, parameters design

摘要： 提出一种网侧PWM整流器LCL滤波器的参数设计方法，通过对LCL滤波器单相模型传递函数的研究，得到谐振频率、谐波电流幅值衰减比与r（网侧电感与整流器侧电感的比例因子）之间的关系式。利用关系式分析各变量的变化规律，确定总电感值、滤波电容值和r。分析结果表明，谐振频率可确定总电感和滤波电容的下限值。给出了一个设计实例，进行系统建模仿真验证。仿真对比结果证明了该设计方法的正确性和优越性。

关键词: PWM整流器, LCL滤波器, 参数设计