Equivalent Modeling Method for Grid-forming Devices for Strength Assessment of Grid-following/Grid-forming Hybrid Systems

HOU Zhixian; LI Yong; WANG Jing; MA Fuyilong; WEI Zheng; XIN Huanhai

doi:10.7500/AEPS20241206002

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Equivalent Modeling Method for Grid-forming Devices for Strength Assessment of Grid-following/Grid-forming Hybrid Systems

Grid-forming Technology | 更新时间：2026-02-28

- Equivalent Modeling Method for Grid-forming Devices for Strength Assessment of Grid-following/Grid-forming Hybrid Systems
- Automation of Electric Power Systems Vol. 49, Issue 22, Pages: 90-100(2025)
- 作者机构：
  
  1.浙江大学电气工程学院，浙江省杭州市 310027
  2.国家电力调度控制中心，北京市 100031
  3.国网电力科学研究院有限公司（南瑞集团有限公司），江苏省南京市 211106
- 作者简介：
- 基金信息：
  
  State Grid Corporation of China(4000-202440367A-3-1-DG)
- DOI：10.7500/AEPS20241206002
  CLC：
- Received：06 December 2024，
  
  Revised：2025-05-14，
  
  Online First：18 September 2025，
  
  Published：25 November 2025
- 稿件说明：
移动端阅览
侯智贤,李勇,王晶等.适应跟网/构网混联系统强度评估的构网型设备等值建模方法[J].电力系统自动化,2025,49(22):90-100.

HOU Zhixian,LI Yong,WANG Jing,et al.Equivalent Modeling Method for Grid-forming Devices for Strength Assessment of Grid-following/Grid-forming Hybrid Systems[J].Automation of Electric Power Systems,2025,49(22):90-100.
侯智贤,李勇,王晶等.适应跟网/构网混联系统强度评估的构网型设备等值建模方法[J].电力系统自动化,2025,49(22):90-100. DOI： 10.7500/AEPS20241206002.

HOU Zhixian,LI Yong,WANG Jing,et al.Equivalent Modeling Method for Grid-forming Devices for Strength Assessment of Grid-following/Grid-forming Hybrid Systems[J].Automation of Electric Power Systems,2025,49(22):90-100. DOI： 10.7500/AEPS20241206002.

摘要

构网型设备凭借其电压/频率主动支撑能力，正推动电力系统形成混联系统典型结构。然而，由于构网型设备多控制环节、高模型阶数及与跟网型设备动态交互复杂，其动态特性的合理表征与降阶建模面临挑战，制约着系统强度量化评估的精度。文中从系统相角强度视角聚焦于小扰动同步稳定问题，提出一种计及跟网/构网型设备动态交互的构网型设备等值建模方法。首先，构建包含两类设备动态交互的相角回路，基于复转矩系数法和正净阻尼判据解析混联系统的同步稳定条件；进一步，将构网型设备降阶为理想电压源串联等值阻抗形式，其等值阻抗参数和正净阻尼系数可联合表征构网型设备的电压源特性及其对系统强度的贡献，并支撑基于短路比指标的系统强度量化评估。所提方法可基于黑箱模型实现，适用于含内环的多种构网型控制策略。最后，通过仿真验证了方法的有效性，并分析了不同控制参数对等值建模结果的影响。

Abstract

Grid-forming (GFM) devices

with their voltage/frequency active support capabilities

are driving the evolution of power systems toward a typical hybrid system structure. However

due to the multiple control links and high model orders of GFM devices

as well as their complex dynamic interaction with grid-following (GFL) devices

the reasonable representation and reduced-order modeling of their dynamic characteristics face challenges

which restrict the accuracy of system strength quantitative evaluation. Focusing on the problem of small-signal synchronous stability from the perspective of system phase-angle strength

an equivalent modeling method for GFM devices that takes into account the dynamic interaction between GFM and GFL devices is proposed. First

a phase-angle loop incorporating dynamic interactions between two types of devices is constructed. The synchronization stability conditions of the hybrid system are analyzed based on the complex torque coefficient method and the positive net damping criterion. Furthermore

GFM devices are reduced to an ideal voltage source with equivalent series impedance

whose equivalent impedance parameters and positive net damping coefficients can jointly characterize the voltage source characteristics of GFM devices and their contributions to system strength

and support the quantitative evaluation of system strength based on short-circuit ratio (SCR) indicators. The proposed method can be implemented on a black-box model and is suitable for various GFM control strategies with inner loops. Finally

the effectiveness of the method is verified through simulation

and the influence of different control parameters on the equivalent modeling results is analyzed.

关键词

Keywords

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