LCL-filter design for grid-connected inverter to suppress grid-induced low-order current harmonics
LCL-filter design for grid-connected inverter to suppress grid-induced low-order current harmonics
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DOI：
10.1109/ecce.2015.7309824
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发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Jinming Xu;Shaojun Xie;Jiarong Kan
中科院分区：
文献类型：
--
作者：
Jinming Xu;Shaojun Xie;Jiarong Kan
对于并网逆变器，广泛采用LCL型滤波器来抑制开关谐波，并利用电容器电流反馈来抑制LCL谐振。已发表的文献中讨论了LCL参数、电容电流反馈和谐振阻尼之间的关系；然而，它们与低阶电流畸变的关系没有得到认真考虑。考虑到使用LCL型滤波器的主要目的是满足电流质量标准，本文深入探讨了LCL型滤波器抑制低次电流谐波的优化设计。结果表明，电网引起的低次电流谐波的抑制与LCL参数密切相关。在根据逆变侧电流开关纹波要求选择逆变侧电感的基础上，设计了电容和网侧电感等其余两个参数，以增强对低次电流谐波的抑制。最后，本研究测试了两组 LCL 参数，其中一组是通过所提出的设计程序获得的。实验结果表明，在电网畸变情况下仍具有良好的电网电流质量。
For grid-connected inverter, an LCL-type filter is widely used to suppress switching harmonics, and the capacitor current feedback is used to suppress the LCL resonance. In the published literatures, the relation among LCL parameters, capacitor current feedback and resonance damping was discussed; however, their relation with the low-order current distortion was not seriously considered. Considering that the main objective of using the LCL-type filter is to fulfill the current quality standard, the optimized design of LCL-type filter for low-order current harmonic suppression is deeply discussed in this paper. It is demonstrated that the suppression of grid-induced low-order current harmonics is closely related to the LCL parameters. On the basis of selecting the inverter-side inductance according to the switching ripple requirement of inverter-side current, the rest two parameters including the capacitance and the grid-side inductance are designed to enhance the low-order current harmonic suppression. Finally, two sets of LCL parameters are tested in this study, one of which is obtained by the proposed design procedure. Experimental results have demonstrated a good grid current quality under a distorted grid.