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首页> 外文会议>IEEE Energy Conversion Congress and Exposition >LCL-filter design for grid-connected inverter to suppress grid-induced low-order current harmonics
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LCL-filter design for grid-connected inverter to suppress grid-induced low-order current harmonics

机译：并网逆变器的LCL滤波器设计可抑制电网感应的低阶电流谐波

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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.
机译：对于并网逆变器，LCL型滤波器被广泛用于抑制开关谐波，而电容器电流反馈被用于抑制LCL谐振。在已发表的文献中，讨论了LCL参数，电容器电流反馈和谐振阻尼之间的关系。然而，它们与低阶电流失真的关系并未得到认真考虑。考虑到使用LCL型滤波器的主要目的是满足电流质量标准，本文深入讨论了用于低阶电流谐波抑制的LCL型滤波器的优化设计。结果表明，电网感应的低阶电流谐波的抑制与LCL参数密切相关。在根据逆变器侧电流的开关纹波要求选择逆变器侧电感的基础上，设计了包括电容和电网侧电感在内的其余两个参数，以增强低阶电流谐波抑制能力。最后，在本研究中测试了两组LCL参数，其中一组通过建议的设计程序获得。实验结果表明，在扭曲的电网下，电网电流质量良好。

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