电工电气杂志社

新型电力系统中构网型逆变器并联的动态相互作用研究

来源：电工电气发布时间：2025-07-25 08:25 浏览次数：8

新型电力系统中构网型逆变器并联的动态相互作用研究

韩翔宇，寇志豪

(国网四川省电力公司成都供电公司，四川成都 610000)

摘要：针对新型电力系统中并联构网型逆变器间的动态交互作用及其可能引发的振荡失稳问题，提出了一种基于 s 域导纳模型的特征值分析方法，将系统中的各电路元件及逆变器控制单元等效为阻抗模型，并构建了五节点电路网络，再通过特征值分析揭示了并联逆变器交互作用下可能存在的谐振失稳模态。研究重点分析了输电线路长度、虚拟阻抗控制环节以及电压前馈单元对系统稳定性的影响机制，研究结果表明：虚拟阻抗控制对系统谐振特性的影响可忽略；电压前馈单元具有显著的谐振抑制作用。通过时域仿真验证了理论分析的结果，为构网型逆变器并网系统的稳定性设计与优化提供了理论依据。

关键词： 新型电力系统；构网型逆变器；导纳模型；虚拟阻抗；特征值分析

中图分类号：TM464 ；TM711 文献标识码：A 文章编号：1007-3175(2025)07-0015-07

Dynamic Interaction Study of the Grid-Forming Inverters Parallel

Connection in New Power Systems

HAN Xiang-yu, KOU Zhi-hao

（State Grid Sichuan Electric Power Company Chengdu Power Supply Company, Chengdu 610000, China）

Abstract: Aiming at the dynamic interaction between parallel grid-forming inverters in the new power system and the potential oscillation instability problems, this paper proposes an eigenvalue analysis method based on the s-domain admittance model. It first equivalents all circuit components in the system and inverter control units to impedance models, then constructs a five- node circuit network, and finally reveals the possible resonant instability modes under the interaction of parallel inverters through eigenvalue analysis. The research focuses on analyzing the influence mechanism of transmission line length, virtual impedance control, and voltage feed forward units on system stability.Results show that virtual impedance control has a negligible effect on system resonance characteristics, while voltage feed forward units can effectively suppress resonance. Time-domain simulations verify the theoretical analysis, offering a theoretical basis for the stability design and optimization of grid-connected systems with grid-forming inverters.

Key words: new power system; grid-forming inverter; admittance model; virtual impedance; eigenvalue analysis

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新型电力系统中构网型逆变器并联的动态相互作用研究