新能源发电因其间歇性、随机性等特点,在大规模并网时会导致电网强度产生较大波动,进而对并网控制系统的稳定性产生不利影响。为解决这一问题,该文建立LCL型三相并网逆变器的系统阻抗模型,深入分析电网强度动态变化对逆变器输出等效阻抗的影响,并揭示了这一变化如何导致谐振频率的迁移现象。结合以上理论分析,提出一种计及短路比的混合阻尼自适应谐振抑制方法。该方法依据发电系统的短路比实时数值,动态调整加权控制系数,自适应地响应系统谐振频率迁移,有效抑制谐振,确保不同电网强度下的并网电流稳定。这一方法不仅能在电网强度宽范围变化时有效工作,且具有较强的适应性和鲁棒性。通过仿真和硬件在环实验验证,该文所提的谐振抑制方法在高渗透新能源并网系统中展现出更优越的效果。
Abstract
Due to the intermittent and stochastic characteristics of renewable energy power generation, large-scale grid connection can cause significant fluctuations in grid strength, which adversely affects the stability of grid-connected control systems. To address this issue, this paper establishes a system impedance model for an LCL-type three-phase grid-connected inverter, conducts an in-depth analysis of the impact of dynamic grid strength variations on the inverter’s output equivalent impedance, and reveals the result of resonance frequency migration. Based on the above theoretical analysis, this paper proposes an adaptive resonance suppression method with hybrid damping considering the short circuit ratio （SCR）. This method dynamically adjusts the weighted control coefficients according to the real-time SCR value of the power generation system, adaptively responds to system resonance frequency migration, effectively suppresses resonance, and ensures stable grid-connected currents under different grid strengths. This approach can not only operate effectively when the power grid intensity varies over a wide range, but also has strong adaptability and robustness. Simulation and hardware-in-the-loop （HIL） experiments verify that the proposed resonance suppression method exhibits superior performance in high-penetration renewable energy grid-connected systems.
关键词
谐振抑制 /
混合阻尼 /
高渗透率 /
自适应控制 /
谐振迁移
Key words
resonance suppression /
mixed damping /
high permeability /
adaptive control /
resonance transfer
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基金
国家自然科学基金（52077191; 62003297）; 燕山大学基础创新科研重点项目（2023LGZD009）
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