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: 2026-06-11
💡 一句话要点
提出GFM控制的电源转换器以提升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: LCC-HVDC 小信号稳定性 电源转换器 GFM控制 弱电网 电力系统稳定性 可再生能源
📋 核心要点
- 随着转换器接口发电的增加，LCC-HVDC系统在弱电网条件下的稳定性面临挑战，现有研究对此关注不足。
- 本文提出了一种小信号状态空间模型，结合GFM-VSC与LCC-HVDC系统，探讨其在弱电网条件下的相互作用。
- 研究结果显示，适度的GFM电源转换器容量即可显著提升LCC-HVDC系统的稳定性，具有实际应用价值。
📝 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，从而影响LCC-HVDC系统的稳定性。本文提出了一种简化的LCC-HVDC模型，并开发了小信号状态空间模型，以研究GFM控制的电压源转换器（GFM-VSC）对LCC-HVDC稳定性的影响。研究表明，即使GFM电源转换器的容量相对于总额定功率的份额较小，也足以确保系统的稳定性。尽管本文主要关注小信号稳定性，但在选择GFM-VSC的最终尺寸时，其他稳定性现象也应考虑。
🔬 方法详解
问题定义：本文旨在解决在弱电网条件下，LCC-HVDC系统的稳定性问题。现有方法未深入探讨GFM-VSC对LCC-HVDC稳定性的影响，导致系统脆弱性增加。
核心思路：通过建立小信号状态空间模型，分析GFM-VSC对LCC-HVDC系统的稳定性影响，提出合理的GFM电源转换器容量配置方案，以增强系统稳定性。
技术框架：研究首先建立简化的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，最后进行小信号稳定性分析。
关键创新：本研究首次系统性地分析了GFM-VSC在弱电网条件下对LCC-HVDC系统稳定性的影响，提出了合理的GFM电源转换器容量配置方案，填补了相关文献的空白。
关键设计：在模型中，GFM-VSC的容量与LCC-HVDC的额定功率之比被设定为关键参数，研究表明即使是较小的容量比例也能显著提升系统稳定性。
🖼️ 关键图片
📊 实验亮点
实验结果表明，GFM-VSC对LCC-HVDC系统的稳定性具有显著的提升效果，适度的GFM电源转换器容量（相对于总额定功率的比例）足以确保系统稳定，具体提升幅度未明确给出，需进一步研究。
🎯 应用场景
该研究可广泛应用于电力系统的稳定性分析与设计，尤其是在可再生能源比例日益增加的背景下，提升LCC-HVDC系统在弱电网条件下的可靠性与安全性，具有重要的实际价值和未来影响。
📄 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.