Assessment of Grid-Tied Renewable Energy Systems’ Voltage Support Capability Under Various Reactive Power Compensation Devices

Jie Cao, Mingshun Liu, Qinfeng Ma, Junqiu Fan, Dongkuo Song (), Xia Zhou, Jianfeng Dai and Hao Wu
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Jie Cao: Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Mingshun Liu: Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Qinfeng Ma: Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Junqiu Fan: Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Dongkuo Song: Guodian Nari Nanjing Control System Co., Ltd., Nanjing 210008, China
Xia Zhou: School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Jianfeng Dai: School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Hao Wu: School of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Energies, 2025, vol. 18, issue 14, 1-21

Abstract: The weak grid strength in regions with large-scale renewable energy integration has emerged as a universal challenge, limiting the further expansion of renewable energy development. Currently, the short-circuit ratio (SCR) is widely used to quantify the relative strength between AC systems and renewable energy. To address this issue, this study first analyzes and compares how different reactive power compensation methods enhance the SCR. It then proposes calculation frameworks for both the SCR and critical short-circuit ratio (CSCR) in renewable energy grid-connected systems integrated with reactive power compensation. Furthermore, based on these formulations, a quantitative evaluation methodology for voltage support strength is developed to systematically assess the improvement effects of various compensation approaches on grid strength. Finally, case studies verify that reactive power compensation provided by synchronous condensers effectively strengthens grid strength and facilitates the safe expansion of the renewable energy integration scale.

Keywords: weak grid strength; renewable energy integration; voltage support strength; synchronous condensers (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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