1.浙江大学电气工程学院,浙江省杭州市 310027
2.云南电网规划建设研究中心,云南省昆明市 650033
谭枫(2002—),男,博士研究生,主要研究方向:新能源电力系统稳定性分析与控制。E-mail:tanfeng@zju.edu.cn
吴琛(1974—),女,硕士,教授级高级工程师,主要研究方向:电力系统及自动化。E-mail:elfwu@21cn.com
冷若寒(2001—),男,博士研究生,主要研究方向:新能源电力系统稳定性分析与控制。E-mail:lengruohan@zju.edu.cn
辛焕海(1981—),男,通信作者,教授,主要研究方向:高比例电力电子装备电力系统稳定性分析和控制。E-mail:xinhh@zju.edu.cn
收稿:2025-12-15,
修回:2026-07-02,
网络首发:2026-08-21,
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谭枫,吴琛,冷若寒等.构网型变流器多机系统关键变流器辨识与低频振荡抑制策略[J/OL].电力系统自动化, http://dx.doi.org/10.7500/AEPS20251215002.
TAN Feng,WU Chen,LENG Ruohan,et al.Key Converter Identification and Low-frequency Oscillation Mitigation Strategy for Grid-forming Converter Multi-machine Systems[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20251215002.
谭枫,吴琛,冷若寒等.构网型变流器多机系统关键变流器辨识与低频振荡抑制策略[J/OL].电力系统自动化, http://dx.doi.org/10.7500/AEPS20251215002. DOI:
TAN Feng,WU Chen,LENG Ruohan,et al.Key Converter Identification and Low-frequency Oscillation Mitigation Strategy for Grid-forming Converter Multi-machine Systems[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20251215002. DOI:
随着构网型变流器并网规模的扩大,多台构网型变流器间的交互作用易诱发低频振荡问题。若所有构网型变流器均引入附加控制回路或优化参数来抑制低频振荡问题,控制参数的设计复杂度将显著增加。为此,文中提出一种基于参与因子的关键构网型变流器辨识与低频振荡抑制策略,仅需对少数关键变流器施加控制即可改善系统稳定性。具体地,文中从Rayleigh商出发,证明构网型变流器多机系统的参与因子具有集中分布特性,即参与因子仅在少数几个构网型变流器节点上取得较大值
而在其他节点上几乎为零。据此,将参与因子高的少数变流器定义为关键变流器并对其实施针对性抑制。研究表明,仅需对少数关键变流器选择性引入附加控制回路或优化控制参数,即可显著提升系统的小干扰稳定裕度。最后,采用仿真算例验证了所提策略的有效性。
With the expansion of grid-forming converter (GFM) grid-connected scale
the interactions among multiple grid-forming converters tend to induce low-frequency oscillations. If additional control loops are introduced or parameters are optimized for all grid-forming converters to suppress low-frequency oscillations
the complexity of control parameter design will increase significantly. To address this issue
this paper proposes a participation-factor-based identification method for critical grid-forming converters and a corresponding low-frequency oscillation suppression strategy. Only a small number of critical converters need to be equipped with control actions to improve system stability. Specifically
starting from the Rayleigh quotient
this paper proves that the participation factors of the grid-forming converter multi-machine system exhibit a concentrated distribution characteristic. That is
large participation factor values appear only at a few grid-forming converter nodes
while the values at other nodes are nearly zero. Accordingly
the few converters with high participation factors are defined as critical converters
and targeted oscillation suppression is implemented on them. Studies show that selectively introducing additional control loops or optimizing control parameters for only a small set of critical converters can markedly improve the small-signal stability margin of the system. Finally
simulation cases are adopted to verify the effectiveness of the proposed strategy.
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