The paper describes power supply and distribution systems to be used on unmanned/man-tended COLUMBUS elements, capable of supplying 10 kW to 30 kW to a variety of users in low earth orbits (LEOs). For the Electrical Power System (EPS) challenging requirements such as the provision of high power levels under hard LEO conditions, maintainability, commonality etc. are to be taken into account. These requirements are to be seen in conjunction with the COLUMBUS IOC (initial operational capability) scenario stipulating that EPS hardware shall be used on the polar platform, the pressurized module attached to the US space station and the man-tended free flier. According to the availability of European technologies, the baseline in the power generation area is a photovoltaic system which provides three regulated main buses (150 V DC) to the users. In order to maintain power supply during eclipse phases, nickel hydrogen batteries will be used for energy storage purposes with nickel cadmium as a back-up solution. The power distribution system needs special attention. Due to the elevated voltage levels mechanical switch gear can no longer be used. It is to be replaced by solid state power controllers (SSPC). Because these devices show a totally different behaviour with regard to conventional realy contacts, new approaches in the area of switching and protection are necessary. In view of the crucial role of this new technology for the realization of medium voltage DC systems, it is of great importance for COLUMBUS and, hence, will receive adequate consideration in the paper.
Advanced power supply and distribution Systems for COLUMBUS
Moderne Systeme der Energieversorgung und der Energieverteilung fuer COLUMBUS
Space Power ; 7 , 3/4 ; 267-292
1987
26 Seiten, 12 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Zeitschrift)
Englisch
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