Transient Voltage Stability Analysis of the Dual-Source DC Power System

Yi Lei, Yang Li, Feng Zhao, Yelun Peng, Zhen Mei and Zhikang Shuai ()
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Yi Lei: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yang Li: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Feng Zhao: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yelun Peng: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhen Mei: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhikang Shuai: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

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

Abstract: This paper analyzes the transient voltage stability of the dual-source DC power system. The system’s equivalent model is first established. Subsequently, the effect mechanisms of line parameters and voltage-source rectifiers’ current control inner loops on the system’s transient voltage instability are investigated. It indicates that these factors reduce the power supply capacity of the source, increasing the risk of transient instability in the system. Then, considering the influence of fault depths, the influence of different large disturbances on the transient voltage stability is investigated. Furthermore, the critical cutting voltage and critical cutting time for DC power systems are determined and then validated on the MATLAB R2023b/Simulink platform. Finally, based on the mixed potential function theory, the impact of system parameter variations on stability boundaries is analyzed quantitatively. Simulation verification is conducted on the MATLAB R2023b/Simulink platform, and experimental verification is conducted on the RT-LAB Hardware-in-the-Loop platform. The results of the quantitative analysis and experiments corroborate the conclusions drawn from the mechanistic analysis, underscoring the critical role of line parameters and converter control parameters in the system’s transient voltage stability.

Keywords: system modeling; transient voltage stability; critical cutting voltage; mixed potential function; operational characteristics; instability mechanism (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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