Grid-Forming Converters for Stability Issues in Future Power Grids
Grid-Forming Converters for Stability Issues in Future Power Grids
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DOI：
10.3390/en15144937
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发表时间：
2022-07
期刊：
影响因子：
3.2
通讯作者：
S. Khan;Mengqi Wang;Wencong Su;Guanliang Liu;Shivam Chaturvedi
中科院分区：
文献类型：
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作者：
S. Khan;Mengqi Wang;Wencong Su;Guanliang Liu;Shivam Chaturvedi
历史上，电力系统依赖于同步发电机（SG）来提供惯性并保持电网稳定性。然而，由于电力电子接口的可再生能源的集成增加，电网的稳定性在过去十年中由于缺乏惯性而受到挑战。目前，该系统主要使用电网跟踪（GFL）转换器，建立在惯性源调节系统稳定性的假设。这种假设不适用于未来的低惯性电网。模拟传统同步电机功能的成网（GFM）变流器已被确定为支持低惯性电网的潜在解决方案。GFM变换器的小信号不稳定性的性能分析可以在文献中找到，但大信号不稳定性仍然是一个开放的研究问题。此外，已经提出了GFM转换器的各种拓扑和配置。本文从大信号稳定性的角度对现有的GFM控制方案进行了综合和比较，为今后GFM变换器的大信号稳定性分析和未来低惯性电网的稳定化研究奠定了基础。
Historically, the power system has relied on synchronous generators (SGs) to provide inertia and maintain grid stability. However, because of the increased integration of power-electronics-interfaced renewable energy sources, the grid’s stability has been challenged in the last decade due to a lack of inertia. Currently, the system predominantly uses grid-following (GFL) converters, built on the assumption that inertial sources regulate the system stability. Such an assumption does not hold for the low-inertia grids of the future. Grid-forming (GFM) converters, which mimic the traditional synchronous machinery’s functionalities, have been identified as a potential solution to support the low-inertia grids. The performance analysis of GFM converters for small-signal instability can be found in the literature, but large-signal instability is still an open research question. Moreover, various topologies and configurations of GFM converters have been proposed. Still, no comparative study combining all GFC configurations from the perspective of large-signal stability issues can be found. This paper combines and compares all the existing GFM control schemes from the perspective of large-signal stability issues to pave the way for future research and development of GFM converters for large-signal stability analysis and stabilization of the future low-inertia grids.