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Placing Storage Energies for Enhancing Small-Signal Stability of Converter-Based-Renewable Systems
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  • Hui Yuan ,
  • Yi Hao,
  • Huanhai Xin ,
  • Yuhan Zhou ,
  • Xiaofei Wang,
  • Chunmeng Chen,
  • Guoqiang Lu,
  • Linan Qu
Hui Yuan

Corresponding Author:[email protected]

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Yi Hao

Corresponding Author:[email protected]

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Huanhai Xin
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Yuhan Zhou
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Xiaofei Wang
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Chunmeng Chen
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Guoqiang Lu
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Abstract

The high penetration of converter-based renewables (CBRs) is challenging the stability and security of modern power systems, e.g., power balance, due to the fast fluctuation of renewables. Storage energies (SEs) are good choices for addressing the power balance issues, due to their flexibility of bi-directional power regulation. However, the bi-directional power regulation of SEs increases the complexity and difficulty for analyzing the CBRinduced small-signal stability issues in a multi-CBR system, which is one kind of key stability issues in modern power systems, especially in weak grids. It has not been theoretically revealed how the placement of SEs influences the CBR-induced small-signal stability issues, when the SEs absorb active power from grids. This paper aims to fill this gap. Based on modal decomposition theory, this paper explicitly demonstrates that the placement of SEs (when absorbing active power from grids) is equivalent to increasing the grid strength and thus enhancing the CBR-induced small-signal stability. Moreover, this paper investigates the optimal placement of SEs for effectively improving the small-signal stability by using a grid-strength-evaluation indicator, named as generalized shortcircuit ratio (gSCR). Finally, the analysis in this paper is validated based on a modified 39-bus test system.
10 Mar 2024Submitted to TechRxiv
01 Apr 2024Published in TechRxiv