1.国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市 410082
2.中国南方电网电力调度控制中心,广东省广州市 510670
罗宇航(2001—),男,博士研究生,主要研究方向:分布式发电与电力电子技术。E-mail:yhl0869@hnu.edu.cn
肖凡(1988—),男,博士,副研究员,主要研究方向:电力电子在电力系统中的应用。E-mail:woliaokk123@126.com
谢伟杰(1995—),男,通信作者,博士研究生,主要研究方向:电力电子技术及其在电力系统中的应用。E-mail:vijayxie@hnu.edu.cn
收稿:2025-09-06,
修回:2026-01-07,
网络首发:2026-06-12,
移动端阅览
罗宇航,肖凡,谢伟杰等.跟-构二象型并网变流器及其小扰动稳定域分析[J/OL].电力系统自动化, http://dx.doi.org/10.7500/AEPS20250906001.
LUO Yuhang,XIIAO Fan,XIE Weijie,et al.Grid-Following and Grid-Forming Dual-natured Grid-connected Converter and Its Small-signal Stability Domain Analysis[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20250906001.
罗宇航,肖凡,谢伟杰等.跟-构二象型并网变流器及其小扰动稳定域分析[J/OL].电力系统自动化, http://dx.doi.org/10.7500/AEPS20250906001. DOI:
LUO Yuhang,XIIAO Fan,XIE Weijie,et al.Grid-Following and Grid-Forming Dual-natured Grid-connected Converter and Its Small-signal Stability Domain Analysis[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20250906001. DOI:
随着分布式电源大规模渗透和输电距离显著延伸,新型电力系统电网强度呈现从极弱电网(短路比为1)到极强电网(短路比为40)的宽范围波动,导致并网变流器稳定性面临严峻挑战。跟网型变流器在弱电网下负阻效应显著,输出波形易畸变;构网型变流器与强电网功率耦合紧密,易引发功率振荡。基于此,文中提出一种跟-构二象型并网变流器,可使用单台并网变流器模拟跟网型/构网型变流器并联系统的外特性。基于阻抗特性曲线分析了跟-构二象型型并网变流器宽电网强度适应性的内在机理。进一步,基于稳定域提出了自适应配比系数选取方法。最后,通过RT-LAB硬件在环平台验证了所提控制策略的有效性及稳定性。分析表明,跟-构二象型型并网变流器兼具良好的主动支撑特性和宽电网强度适应能力,为电网强度大幅波动下增强并网系统稳定性提供了一种简单灵活、经济高效、电网友好的解决方案。
With the large-scale penetration of distributed generators and the significant extension of transmission distance
the grid strength of the new power system exhibits wide-range fluctuations from the extremely weak grid (the short-circuit ratio is 1) to the extremely strong grid (the short-circuit ratio is 40). This poses severe challenges to the stability of grid-connected converters. The grid-following converter is prone to exhibiting negative impedance effect in the weak grid
resulting in distorted output waveforms. The grid-forming converter has tight power coupling with the strong grid
which is prone to power oscillation. To address these issues
this paper proposes a grid-following and grid-forming dual-natured grid-connected converter
which can simulate the external characteristics of the parallel system of grid-following and grid-forming converters with a single grid-connected converter. The internal mechanism of the wide grid strength adaptability of the grid-following and grid-forming dual-natured grid-connected converter is analyzed based on the impedance characteristic curves. Furthermore
an adaptive selection method for the proportion coefficient is proposed based on the stable domain. Finally
the effectiveness and the stability of the proposed control strategy are verified through the RT-LAB hardware-in-the-loop platform. Analysis demonstrates that the grid-following and grid-forming dual-natured grid-connected converter has excellent active support characteristics and wide grid-strength adaptability
providing a simple
flexible
cost-effective
and grid-friendly solution for improving the stability of the grid-connected system with large fluctuations in grid strength.
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