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基于阻抗的LLCL滤波并网逆变器在电网电抗宽范围变化下的鲁棒性设计原理

Principle and Robust Impedance-Based Design of Grid-tied Inverter with LLCL-Filter under Wide Variation of Grid-Reactance

语言:

中文摘要

本文研究了电网阻抗变化对高阶(LCL/LLCL)滤波并网逆变器稳定性的影响。针对分布式系统中存在的容性负载、PFC电容及长电缆等复杂工况,提出了一种基于阻抗分析的鲁棒性设计方法,旨在解决电网电抗宽范围波动下的系统稳定性与控制性能优化问题。

English Abstract

Currently, how the inductive grid impedance variation affects the stability of digitally controlled grid-tied inverters with a high-order (LCL or LLCL) filter has been numerously studied. Note that a distributed power system may contain the capacitive load, the power factor correction (PFC) capacitor, and the long cable. During the design of grid-tied inverters, we should address the effects of th...
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SunView 深度解读

该研究直接服务于阳光电源组串式及集中式光伏逆变器在复杂电网环境下的并网性能优化。随着全球光伏渗透率提升,弱电网(高阻抗)环境日益普遍,LLCL滤波器因其体积小、滤波效果好被广泛应用。本文提出的基于阻抗的鲁棒设计方法,可有效提升阳光电源逆变器在电网电抗波动下的谐振抑制能力和并网稳定性,减少因电网环境变化导致的脱网风险。建议研发团队将其应用于iSolarCloud智能运维平台的电网环境自适应控制策略中,进一步增强产品在弱电网场景下的竞争优势。