An Analog-Device-Based Five-Domain Control Method and Distributed System Configuration for High-Power Spacecraft Power Systems

Abstract

Deep space exploration is gaining increasing interest as the space station and lunar base projects are putting on the agenda. Due to the limited power level of the power controlling unit (PCU), high-power space power systems have to be constructed with several PCUs, forming a PCU interconnection system. However, the existing control methods and architectures are either unsuitable for systems with more than two PCUs or must be implemented with the digital controller, which is rarely used in space power systems due to the single-event upset (SEU). In this article, a communication-free distributed configuration for PCU interconnection system and a novel analog-device-based five-domain control method are proposed. Detailed control strategies and five working modes of the PCU subsystem are analyzed. Seamless switch during mode transition is realized by designing control parameters carefully, which ensures the stability of the PCU bus voltage. A three-PCU interconnection system is constructed, and both steady-state and dynamic responses of the system are tested, validating the effectiveness of the proposed control method.