Sizing of a grid-forming power converter to improve the small-signal stability of an LCC-HVDC system connected to a weak grid
作者: Anup Joshi, Javier Renedo, Xavier Guillaud
分类: eess.SY
发布日期: 2026-06-12
💡 一句话要点
提出GFM控制的电源转换器以改善LCC-HVDC系统的稳定性
🎯 匹配领域: 支柱四：生成式动作 (Generative Motion)
关键词: 高压直流输电 电源转换器 小信号稳定性 弱电网 GFM控制 电力系统
📋 核心要点
- 随着CIG的增加，LCC-HVDC系统在弱电网条件下的稳定性面临严重挑战，现有研究对此关注不足。
- 本文提出了一种简化的LCC-HVDC模型，并结合GFM-VSC进行小信号稳定性分析，以探讨其对系统稳定性的影响。
- 研究结果表明，适度的GFM电源转换器容量能够有效提升LCC-HVDC系统在弱电网条件下的稳定性。
📝 摘要（中文）
线换流器高压直流（LCC-HVDC）技术在长距离大功率传输中表现出色，但随着转换器接口发电（CIG）的增加，导致交流电网变弱，使LCC-HVDC系统的稳定性受到挑战。本文提出了一种简化的LCC-HVDC模型，并开发了包含GFM控制电压源转换器（VSC）的小信号状态空间模型，以研究不同组件之间的相互作用。研究表明，GFM-VSC在弱电网条件下对LCC-HVDC的稳定性具有显著的稳定作用，且适度的GFM电源转换器容量即可确保系统稳定性。虽然本研究主要集中在小信号稳定性上，但在选择GFM-VSC的最终尺寸时，其他稳定现象也应考虑。
🔬 方法详解
问题定义：本文旨在解决LCC-HVDC系统在弱电网条件下的稳定性问题，现有方法未深入探讨GFM-VSC对其稳定性的影响。
核心思路：通过建立小信号状态空间模型，分析GFM-VSC与LCC-HVDC系统的相互作用，验证GFM-VSC的稳定作用。
技术框架：研究首先提出简化的LCC-HVDC模型，然后构建包含GFM-VSC和无限电网的小信号状态空间模型，进行稳定性分析。
关键创新：本研究首次深入探讨了GFM-VSC在弱电网条件下对LCC-HVDC系统稳定性的影响，提出了相对较小容量的GFM电源转换器即可确保系统稳定。
关键设计：在模型中，GFM-VSC的容量与LCC-HVDC的额定功率相结合，进行小信号稳定性分析，确保设计的有效性和实用性。
🖼️ 关键图片
📊 实验亮点
实验结果表明，GFM-VSC在弱电网条件下对LCC-HVDC系统的稳定性具有显著的提升作用。即使GFM电源转换器的容量仅占总额定功率的一小部分，也能有效确保系统的稳定性，显示出其在实际应用中的潜力。
🎯 应用场景
该研究的成果可广泛应用于电力系统的设计与优化，尤其是在弱电网环境下的高压直流输电系统中。通过合理配置GFM-VSC的容量，可以有效提升系统的稳定性，确保电力传输的安全与可靠性，具有重要的实际价值和应用前景。
📄 摘要（原文）
Line-commutated converter high-voltage direct current (LCC-HVDC) has proven to be a reliable technology for bulk power transmission over long distances. However, the growing penetration of converter interfaced generation (CIG) is resulting in weaker AC grids, rendering the operation of LCC-HVDC systems vulnerable and posing a serious challenge to their stability. Grid-forming (GFM) controlled voltage source converter (VSC) have been shown to provide stabilizing impact in weak grid conditions. However, the impact of GFM controlled VSCs (GFM-VSC) on stability of LCC-HVDC in weak grid conditions has not been studied in depth in the literature. In this paper, a simplified model of LCC-HVDC is proposed and validated. Then a small-signal state-space model of a system consisting of aforementioned LCC-HVDC, a GFM-VSC and an infinite grid is developed to study the interactions between different components. The small-signal stability analysis shows the stabilizing effect of the GFM-VSC on the stability of the LCC-HVDC link in weak grid condition. Furthermore, the study on the sizing of the GFM power converter reveals that even a modest share of the capacity of the GFM power converter relative to the total nominal apparent power (sum of nominal power of LCC-HVDC and the nominal apparent power of GFM-VSC) is sufficient to ensure the stability of the system, in the test system analyzed in this study. This work just focuses in small-signal stability, but it is important to highlight that other stability phenomena should also be taken into account when selecting the final size of the GFM-VSC.