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基于分离结构UDE的LCL型并网逆变器加权平均电流控制策略

Separate-Structure UDE-Based Current Resonant Control Strategy on LCL-Type Grid-Tied Inverters With Weighted Average Current Method for Improved Injected Current Quality and Robustness

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中文摘要

LCL滤波器因其优异的高频抑制能力被广泛应用于逆变器与电网之间,但其谐振特性易导致系统不稳定。本文提出了一种基于加权平均电流(WAC)和分离结构扰动观测器(UDE)的控制策略,通过优化电感电流与注入电流的权重系数,有效抑制了LCL谐振,提升了并网电流质量及系统在弱电网下的鲁棒性。

English Abstract

Due to its effective high-frequency suppression ability, the LCL filter has been widely used between inverters and the grid. However, its resonance causes system instability. The weighted-average current (WAC) strategy has been extensively studied to suppress resonance. By selecting a proper weight factor of the inductor and injected current, the order of the LCL can be reduced to first without re...
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SunView 深度解读

该研究直接针对阳光电源核心产品——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侧的关键组件,随着电网环境日益复杂(弱电网场景增多),谐振抑制与并网稳定性成为提升产品竞争力的关键。该文提出的加权平均电流与UDE控制策略,能够显著提升逆变器在复杂电网下的电流质量,减少对硬件阻尼的依赖,从而降低成本并提升效率。建议研发团队在下一代组串式逆变器(如SG系列)的控制算法中引入该鲁棒控制方案,以增强产品在弱电网环境下的并网适应性。