LCL型并网滤波器参数设计方法

摘要

LCL型滤波器对高次谐波电流抑制能力强、体积小、成本低,适合中大功率并网逆变器应用,但滤波器参数多、关系紧密,使得参数选取十分复杂和困难。提出一种兼顾物理意义和部分储能最小优化的LCL滤波器参数设计方法,并将有源阻尼技术对滤波器参数的配置要求作为在满足滤波要求前提下选择滤波器参数的依据。本文详细分析了并网逆变器的谐波特性、设计准则和计算流程,并通过一个具体设计实例,给出在不同有源阻尼策略下LCL滤波器参数配置的建议。%Characterized with high harmonic current attenuating, low bulk and low cost, the LCL filter is suitable for middle and high power grid-connected inverters. Whereas, the optimization of filter parameters is complicated and difficult due to the multiplicity and coupling of elements. A design method was proposed considering the physical meaning and partial storage energy optimized, and the relationship between the filter parameters and active damping of the resonance was introduced in the parameters selection procedure. The harmonic characteristic, design specifications and calculating procedure were analyzed and listed. Finally, based on an example, the selection results of LCL filter parameters were advised under different active damping strategies.