Grid-following and Grid-forming Dual-natured Grid-connected Converter and Its Small-signal Stability Region Analysis

LUO Yuhang; XIAO Fan; XIE Weijie; TU Chunming; ZHENG Yuting; LI Jin

doi:10.7500/AEPS20250906001

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Grid-following and Grid-forming Dual-natured Grid-connected Converter and Its Small-signal Stability Region Analysis

Grid-forming Technology | 更新时间：2026-11-04

- Grid-following and Grid-forming Dual-natured Grid-connected Converter and Its Small-signal Stability Region Analysis
- Automation of Electric Power Systems Vol. 50, Issue 21, Pages: 80-94(2026)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  Smart Grid National Science and Technology Major Project(2025ZD0804400)
- DOI：10.7500/AEPS20250906001
  CLC：
- Received：06 September 2025，
  
  Revised：2026-01-07，
  
  Online First：12 June 2026，
  
  Published：10 November 2026
- 稿件说明：
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].电力系统自动化,2026,50(21):80-94.

LUO Yuhang,XIAO Fan,XIE Weijie,et al.Grid-following and Grid-forming Dual-natured Grid-connected Converter and Its Small-signal Stability Region Analysis[J].Automation of Electric Power Systems,2026,50(21):80-94.
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].电力系统自动化,2026,50(21):80-94. DOI： 10.7500/AEPS20250906001.

LUO Yuhang,XIAO Fan,XIE Weijie,et al.Grid-following and Grid-forming Dual-natured Grid-connected Converter and Its Small-signal Stability Region Analysis[J].Automation of Electric Power Systems,2026,50(21):80-94. DOI： 10.7500/AEPS20250906001.

摘要

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-构二象型并网变流器宽范围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-构二象型并网变流器兼具良好的主动支撑特性和宽范围电网强度适应能力，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。

Abstract

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 the negative impedance effect in the weak grid

resulting in distorted output waveforms. The grid-forming converter has tight power coupling with the strong power 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-range power 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 stability region. 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-range power 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 power grid strength.

关键词

Keywords

references

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