构网型变流器宽短路比范围适应性分析与提升  

Adaptability Analysis and Enhancement of Grid-forming Converter for Wide-range Short-circuit Ratio

作　　者：刘龙 胡彬 王垚鑫 廖玉茗 黄旭东 年珩[1] LIU Long;HU Bin;WANG Yaoxin;LIAO Yuming;HUANG Xudong;NIAN Heng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2025年第2期64-72,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52325702)。

摘　　要：随着新能源渗透率的增大,电网的复杂度也随之增加,基于构网控制的并网变流器面临电网短路比宽范围变化的并网环境。为了研究构网型变流器并网时潜在的稳定性问题,并提升其在宽短路比范围电网下的适应性,文中建立了考虑功率控制、坐标变换以及电压-电流控制的阻抗模型,通过分析降阶阻抗模型揭示了构网型变流器与强网交互时的失稳机理。进而,提出了混合虚拟阻抗法,在全频段内提升了构网型变流器的并网稳定性以及在复杂电网环境下的适应性。最后,通过实验验证了阻抗特性分析的正确性与所提控制策略的有效性。With the increase of penetration of renewable energy sources,the complexity of the power grid also escalates.Gridforming(GFM)converters face the grid-connection environment with a wide range of short-circuit ratio of the power grid.In order to study the potential stability issues of the GFM converter and enhance its adaptability in the power grid with a wide range of shortcircuit ratio,this paper establishes an impedance model considering power control,coordinate transformation,and voltage-current control.By analyzing the order-reduced impedance model,the instability mechanism of the GFM converter interacting with a strong power grid is revealed.Then,a hybrid virtual impedance method is proposed to improve the grid-connection stability of GFM converters over a wide frequency range and enhance the adaptability in complex grid environments.Finally,the correctness of the impedance characteristic analysis and the effectiveness of the proposed control strategy are verified through the experiment.

关 键 词：并网稳定性 构网型变流器 次同步振荡 小信号建模 阻抗重塑 宽短路比范围 

分 类 号：TM46[电气工程—电器]