Optimal Configuration Model for Large Capacity Synchronous Condenser Considering Transient Voltage Stability in Multiple UHV DC Receiving End Grids

Lang Zhao, Zhidong Wang, Hao Sheng (), Yizheng Li, Xueying Wang, Yao Wang and Haifeng Yu
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Lang Zhao: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Zhidong Wang: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Hao Sheng: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Yizheng Li: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Xueying Wang: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Yao Wang: Economic and Technological Research Institute of State Grid Shanxi Electric Power Co., Ltd., Taiyuan 030021, China
Haifeng Yu: Economic and Technological Research Institute of State Grid Hunan Electric Power Co., Ltd., Changsha 030021, China

Energies, 2024, vol. 17, issue 21, 1-21

Abstract: In a multi-fed DC environment, the UHV DC recipient grid faces significant challenges related to DC phase shift failure and voltage instability due to the high AC/DC coupling strength and low system inertia level. While the new large-capacity synchronous condensers (SCs) can provide effective transient reactive power support, the associated investment and operation costs are high. Therefore, it is valuable to investigate the optimization of SC configuration at key nodes in the recipient grid in a scientific and rational manner. This study begins by qualitatively and quantitatively analyzing the dynamic characteristics of DC reactive power and induction motors under AC faults. The sub-transient and transient reactive power output model is established to describe the SC output characteristics, elucidating the coupling relationship between the SC’s reactive power output and the DC reactive power demand at different time scales. Subsequently, a critical stabilized voltage index for dynamic loads is defined, and the SC’s reactive power compensation target is quantitatively calculated across different time scales, revealing the impact of transient changes in DC reactive power on the transient voltage stability of the multi-fed DC environment with dynamic load integration. Finally, an optimal configuration model for the large-capacity SC is proposed under the critical stability constraint of dynamic loads to maximize the SC’s reactive power support capability at the lowest economic cost. The proposed model is validated in a multi-fed DC area, demonstrating that the optimal configuration scheme effectively addresses issues related to DC phase shift failures and voltage instability resulting from AC bus voltage drops.

Keywords: AC/DC hybrid grid; multi-feed DC; transient voltage stability; synchronous condenser; optimal configuration; dynamic load (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: 2024
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