史梓益,张晓楠,田晓康,郑乐,张天策,李庚银
SHI Ziyi,ZHANG Xiaonan,TIAN Xiaokang,ZHENG Le,ZHANG Tiance,LI Gengyin

• 1:新能源电力系统全国重点实验室(华北电力大学)

摘要(Abstract)：

新能源在电力系统中的渗透率不断提升，传统跟网型变流器在并入高比例新能源电力系统时存在小信号失稳风险，而构网型变流器可在一定程度上提升系统的稳定裕度。针对构网型变流器在高比例新能源电力系统中的选址定容问题，构建了基于gSCR（广义短路比）与IMR（阻抗裕度比）的双指标评估体系，提出一种结合拓扑导纳与频域阻抗特性灵敏度的构网型变流器优化配置方法。通过构建gSCR与IMR的容量配比模型，在系统的薄弱节点配置构网型变流器，并在IEEE 14节点系统中进行仿真验证。结果表明，在薄弱节点布置合适容量的构网型变流器可显著提升系统的模态阻尼与系统整体稳定裕度。研究为高比例新能源电力系统的稳定性优化提供了理论与技术支撑。
With the increasing penetration of renewable energy in power systems, the integration of conventional grid-following(GFL) converters into power systems with a high share of renewables poses a risk of small-signal instability. In contrast, grid-forming(GFM) converters can enhance the system stability margin to a certain extent. Addressing the optimal siting and sizing of GFM converters in high-renewable penetration power systems, this paper establishes a dual-index assessment system based on generalized short-circuit ratio(gSCR) and impedance margin ratio(IMR). An optimal method for configuring GFM converters is proposed, incorporating the sensitivity of topological admittance and frequency-domain impedance characteristics. By developing a capacity allocation model for gSCR and IMR, GFM converters are deployed at the weak nodes of the system. Simulations conducted on the IEEE 14-bus system validate the approach. The results demonstrate that deploying GFM converters with appropriate capacity at weak nodes significantly improves the modal damping and the overall system stability margin. This research provides theoretical and technical support for stability optimization in power systems with a high penetration of renewable energy.

关键词(KeyWords)： 跟网型变流器;构网型变流器;广义短路比;阻抗裕度比;新能源电力系统
GFL converter;GFM converter;gSCR;IMR;renewable power system

Abstract:

Keywords:

基金项目(Foundation): 智能电网重大专项（2030）(2024ZD0802900)

作者(Author): 史梓益,张晓楠,田晓康,郑乐,张天策,李庚银
SHI Ziyi,ZHANG Xiaonan,TIAN Xiaokang,ZHENG Le,ZHANG Tiance,LI Gengyin

DOI: 10.19585/j.zjdl.202510006

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