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CSEE Journal of Power and Energy Systems 2022, 8(3): 710-720 https://doi.org/10.17775/CSEEJPES.2021.03020
Open Access | Issue | Published: 16 November 2021

A Critical System Strength Evaluation of a Power System with High Penetration of Renewable Energy Generations

Show Author's Information Lin Yu,  Huadong Sun( ),  Shiyun Xu,  Bing Zhao,  Jian Zhang
State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute, Beijing, 100192, China
Keywords:
Critical short circuit ratio, critical value, grid impedance ratio, maximum power transfer theorem, static equivalent circuit analysis
Cite this article:
Yu L, Sun H, Xu S, et al. A Critical System Strength Evaluation of a Power System with High Penetration of Renewable Energy Generations. CSEE Journal of Power and Energy Systems, 2022, 8(3): 710-720. https://doi.org/10.17775/CSEEJPES.2021.03020
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Abstract Full text About this article

The power system is experiencing a higher penetration of renewable energy generations (REGs). The short circuit ratio (SCR) and the grid impedance ratio (GIR) are two indices to quantify the system strength of the power system with REGs. In this paper, the critical short circuit ratio (CSCR) is defined as the corresponding SCR when the system voltage is in the critical stable state. Through static voltage stability analysis, the mathematical expression of the CSCR considering the impact of GIR is derived. The maximum value of CSCR is adopted as the critical value to distinguish the weak power system. Based on the static equivalent circuit analysis, it is proved that the CSCR is still effective to evaluate critical system strength considering the interactive impact among REGs. Finally, we find that the GIR can be neglected and the SCR can be used individually to evaluate the system strength when SCR>2 or GIR>5. The correctness and rationality of the CSCR and its critical value are validated on ADPSS.


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About this article

A Critical System Strength Evaluation of a Power System with High Penetration of Renewable Energy Generations

Show Author's information Lin Yu, Huadong Sun( ), Shiyun Xu, Bing Zhao, Jian Zhang
State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute, Beijing, 100192, China

Abstract

The power system is experiencing a higher penetration of renewable energy generations (REGs). The short circuit ratio (SCR) and the grid impedance ratio (GIR) are two indices to quantify the system strength of the power system with REGs. In this paper, the critical short circuit ratio (CSCR) is defined as the corresponding SCR when the system voltage is in the critical stable state. Through static voltage stability analysis, the mathematical expression of the CSCR considering the impact of GIR is derived. The maximum value of CSCR is adopted as the critical value to distinguish the weak power system. Based on the static equivalent circuit analysis, it is proved that the CSCR is still effective to evaluate critical system strength considering the interactive impact among REGs. Finally, we find that the GIR can be neglected and the SCR can be used individually to evaluate the system strength when SCR>2 or GIR>5. The correctness and rationality of the CSCR and its critical value are validated on ADPSS.

Keywords: Critical short circuit ratio, critical value, grid impedance ratio, maximum power transfer theorem, static equivalent circuit analysis

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Publication history

Received: 18 April 2021
Revised: 01 June 2021
Accepted: 27 September 2021
Published: 16 November 2021
Issue date: May 2022

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© 2021 CSEE

Acknowledgements

Acknowledgements

This work is supported by the Science and Technology Project of State Grid Corporation of China (No. XT71-20-014).

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