An LLCL Power Filter for Single-Phase Grid-Tied Inverter
An LLCL Power Filter for Single-Phase Grid-Tied Inverter
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DOI：
10.1109/tpel.2011.2161337
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发表时间：
2012-02-01
影响因子：
6.7
通讯作者：
Blaabjerg, Frede
中科院分区：
文献类型：
--
作者：
Wu, Weimin;He, Yuanbin;Blaabjerg, Frede
本文提出了一种用于并网电压源逆变器的高阶功率滤波器的新拓扑，命名为LLCL滤波器，该拓扑在传统LCL滤波器电容器的支路回路中插入一个小电感，在开关频率下组成串联谐振电路。特别是，它可以比 LCL 滤波器更好地衰减开关频率电流纹波分量，从而减少总电感和体积。此外，通过减小网侧电感的电感，提高了特征谐振频率，有利于逆变系统的控制。还介绍了所提出的 LLCL 滤波器的参数设计标准。通过在 1.8 kW 单相并网逆变器原型上进行实验，对传统 LCL 滤波器和所提出的 LLCL 滤波器进行了比较分析和讨论。
This paper presents a new topology of higher order power filter for grid-tied voltage-source inverters, named the LLCL filter, which inserts a small inductor in the branch loop of the capacitor in the traditional LCL filter to compose a series resonant circuit at the switching frequency. Particularly, it can attenuate the switching-frequency current ripple components much better than an LCL filter, leading to a decrease in the total inductance and volume. Furthermore, by decreasing the inductance of a grid-side inductor, it raises the characteristic resonance frequency, which is beneficial to the inverter system control. The parameter design criteria of the proposed LLCL filter is also introduced. The comparative analysis and discussions regarding the traditional LCL filter and the proposed LLCL filter have been presented and evaluated through experiment on a 1.8-kW-single-phase grid-tied inverter prototype.