A Simple Differential Mode EMI Suppressor for the $LLCL$-Filter-Based Single-Phase Grid-Tied Transformerless Inverter
A Simple Differential Mode EMI Suppressor for the $LLCL$-Filter-Based Single-Phase Grid-Tied Transformerless Inverter
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DOI：
10.1109/tie.2014.2385666
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发表时间：
2015-07
影响因子：
7.7
通讯作者：
Jun Ji;Weimin Wu;Yuanbin He;Zhe Lin;F. Blaabjerg;H. Chung
中科院分区：
文献类型：
--
作者：
Jun Ji;Weimin Wu;Yuanbin He;Zhe Lin;F. Blaabjerg;H. Chung
随着光伏应用的发展，单相功率转换器的拓扑结构仍然包括无源滤波器，如LCL或LLCL-Filter。与LCL滤波器相比，LLCL滤波器的总电感可以大大降低。然而，由于谐振电感与旁路电容串联，基于LLCL滤波器的并网逆变器的差模(DM)电磁干扰(EMI)噪声衰减。传统的方法是在LLCL滤波器的LC谐振电路支路上并联插入一个电容器，以抑制DM EMI噪声。为了获得较小的电容值，同时使附加无功功率最小，提出了一种用于基于LLCL滤波器的系统的新型简单DM EMI抑制器。详细分析和比较了两种DM电磁干扰抑制器的特点。在一台0.5kW、110V/50赫兹的单相并网逆变器样机上进行了仿真和实验，验证了分析的正确性。
The single-phase power converter topologies evolving of photovoltaic applications are still including passive filters, like the LCLor LLCL-filter. Compared with the LCL-filter, the total inductance of the LLCL-filter can be reduced a lot. However, due to the resonant inductor in series with the bypass capacitor, the differential mode (DM) electromagnetic interference (EMI) noise attenuation of an LLCL-filter-based grid-tied inverter declines. Conventionally, a capacitor was inserted in parallel with the LC resonant circuit branch of the LLCL-filter to suppress the DM EMI noise. In order to achieve a small value of capacitor as well as to minimize the additional reactive power, a novel simple DM EMI suppressor for the LLCL-filter-based system is proposed. The characters of two kinds of DM EMI suppressor are analyzed and compared in detail. Simulations and experiments on a 0.5-kW 110-V/50-Hz single-phase grid-tied inverter prototype are accomplished to confirm the analysis.