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新型電力系統中構網型逆變器并聯的動態相互作用研究

來源：電工電氣發布時間：2025-07-25 08:25 瀏覽次數：113

新型電力系統中構網型逆變器并聯的動態相互作用研究

韓翔宇，寇志豪

(國網四川省電力公司成都供電公司，四川成都 610000)

摘要：針對新型電力系統中并聯構網型逆變器間的動態交互作用及其可能引發的振蕩失穩問題，提出了一種基于 s 域導納模型的特征值分析方法，將系統中的各電路元件及逆變器控制單元等效為阻抗模型，并構建了五節點電路網絡，再通過特征值分析揭示了并聯逆變器交互作用下可能存在的諧振失穩模態。研究重點分析了輸電線路長度、虛擬阻抗控制環節以及電壓前饋單元對系統穩定性的影響機制，研究結果表明：虛擬阻抗控制對系統諧振特性的影響可忽略；電壓前饋單元具有顯著的諧振抑制作用。通過時域仿真驗證了理論分析的結果，為構網型逆變器并網系統的穩定性設計與優化提供了理論依據。

關鍵詞： 新型電力系統；構網型逆變器；導納模型；虛擬阻抗；特征值分析

中圖分類號：TM464 ；TM711 文獻標識碼：A 文章編號：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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新型電力系統中構網型逆變器并聯的動態相互作用研究