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基于自适应极值搜索控制的LCL滤波器谐振频率在线估计

Adaptive Extremum Seeking Control Based LCL Filter Resonant Frequency Online Estimation

语言:

中文摘要

LCL滤波器广泛应用于并网逆变器系统中,但其谐振特性会降低系统稳定裕度和控制性能。电网阻抗的变化会导致谐振频率漂移,进一步削弱系统鲁棒性。因此,实时获取LCL滤波器的实际谐振频率对于优化控制策略至关重要。

English Abstract

The LCL filter has been widely used in the grid-tied inverter systems. However, the resonance of the LCL filter can reduce the system stability margin and the control performance. Moreover, the grid impedance variations can lead to the drift of the resonant frequency, which can further worsen the system robustness. Thus, it is important to know the actual resonant frequency of the LCL filter. In t...
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SunView 深度解读

该技术对阳光电源的核心产品线(组串式逆变器、集中式逆变器)具有极高的应用价值。在弱电网环境下,电网阻抗波动是导致逆变器并网不稳定的主要挑战之一。通过引入自适应极值搜索控制(ESC)进行谐振频率在线估计,阳光电源的逆变器产品可以实现更精准的谐振抑制策略,无需依赖复杂的电网阻抗测量硬件,从而提升产品在复杂电网环境下的适应性和鲁棒性。建议研发团队将其集成至iSolarCloud智能运维平台或逆变器底层控制算法中,以优化弱电网下的并网性能,提升产品竞争力。