A Fault-Tolerant Strategy for Three-Level Flying-Capacitor DC/DC Converter in Spacecraft Power System

Haijin Li (), Yu Gu, Xiaofeng Zhang, Zhigang Liu, Longlong Zhang and Yi Zeng
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Haijin Li: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
Yu Gu: School of Mechanical Engineering and Automation, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
Xiaofeng Zhang: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
Zhigang Liu: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
Longlong Zhang: Department of Electrical Engineering, China University of Petroleum (East China), Qingdao 266580, China
Yi Zeng: Beijing Institute of Spacecraft System Engineering, Beijing 100094, China

Energies, 2023, vol. 16, issue 1, 1-15

Abstract: With the development of space exploration, high-power and high-voltage power systems are essential for future spacecraft applications. Because of the effects of space radiation such as single event burnout (SEB), the rated voltage of power devices in converters for a spacecraft power system is limited to a level much lower than that for traditional ground applications. Thus, multi-level DC/DC converters are good choices for high-voltage applications in spacecraft. In this paper, a fault-tolerant strategy is proposed for a three-level flying capacitor DC/DC converter to increase the reliability with minimal cost. There is no extra hardware needed for the proposed strategy; the fault tolerance of the converter is only achieved by changing the software control strategy. A stage analysis of the proposed strategy is provided in detail for different fault locations and ratios between the input and output voltage. Finally, a simulation model and prototype are built to verify the effectiveness of the proposed strategy.

Keywords: fault-tolerant strategy; high voltage; three level; flying capacitor; DC/DC converter; spacecraft power system (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: 2023
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