The harmonic analysis and suppression methods for photovoltaic grid system based on improved LCL filter

2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia) Pub Date : 2016-05-22 DOI:10.1109/IPEMC.2016.7512527

Wenjin Wu, Jianhui Su, Yong Shi, Haining Wang, Du Yan

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Abstract

For the resonance phenomenon in LCL filter interconnection interface of photovoltaic grid system, the mechanism of the interconnection node voltage resonance and the reason for resonance frequency changing are analyzed. In this paper, a control method based on virtual harmonic impedance is proposed. The virtual harmonic impedance is composed of virtual resistance and virtual inductance. It shows the characteristic of resistance and inductance in low frequency band and has good effect of harmonic suppression. It shows the resistance characteristics in high frequency band and suppresses the harmonic amplification. A improved LCL filter is designed based on virtual harmonic impedance control method. The improved method is LC resonance branch paralleled on damping branch and provides low resistance pathway for the harmonic current near carrier frequency. The filtering effect is strengthened and the method reduces power loss of the damping resistor. Finally the simulation experiments show the effectiveness of the proposed method.

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基于改进LCL滤波器的光伏电网系统谐波分析与抑制方法

针对光伏电网系统LCL滤波器互联界面的谐振现象，分析了互联节点电压谐振的机理和谐振频率变化的原因。本文提出了一种基于虚拟谐波阻抗的控制方法。虚谐波阻抗由虚电阻和虚电感组成。它在低频段表现出电阻和电感的特性，具有良好的谐波抑制效果。它显示了高频电阻特性，抑制了谐波放大。基于虚拟谐波阻抗控制方法，设计了一种改进的LCL滤波器。改进后的方法是在阻尼支路上并联LC谐振支路，为载频附近的谐波电流提供低阻通道。该方法增强了滤波效果，降低了阻尼电阻的功率损耗。最后通过仿真实验验证了该方法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)

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