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一种改进型电容电流反馈的LCL型并网逆变器宽阻尼区域控制方法

Wide Damping Region for LCL-Type Grid-Connected Inverter With an Improved Capacitor-Current-Feedback Method

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中文摘要

本文在离散域对LCL型并网逆变器进行了稳定性分析。研究发现,即使当谐振频率高于采样频率的六分之一时系统保持稳定,但受电网阻抗影响,仍需有效的阻尼方案。文章提出了一种改进的电容电流反馈方法,旨在拓宽系统的稳定阻尼区域,提升并网性能。

English Abstract

This paper has presented a stability analysis of a LCL-type grid-connected inverter in the discrete-time domain. It has been found that even though the system is stable when the resonance frequency f,. is higher than one-sixth of the sampling frequency (f8/6), an effective damping scheme is still required due to the potential influence of the grid impedance. With a conventional proportional capaci...
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SunView 深度解读

该研究直接针对阳光电源核心产品线——组串式及集中式光伏逆变器的并网控制技术。LCL滤波器是逆变器输出端的关键部件,其谐振抑制直接影响并网电能质量及系统稳定性。在当前弱电网环境下,电网阻抗波动大,该改进型电容电流反馈方法能有效提升逆变器在宽阻抗范围下的鲁棒性,减少对硬件阻尼电阻的依赖,从而降低损耗并提升效率。建议研发团队将其应用于新一代组串式逆变器控制算法优化中,以增强产品在复杂电网环境下的适应能力。