COLUMBUS POWER ARCHITECTURE AND POWER BUS STABILITY

摘要

The evolution of the Space Station power system resulted in a pre-regulated 160 Vdc primary power system and a fine-regulated 120 Vdc secondary power distribution. The secondary voltage is derived through transformer isolating and redundant pairs of DC-to-DC converter units (DDCU) suppling the various space station elements and so also the European APM. The decision for a 120 V power distribution has initiated the development of solid state power controlers (SSPC) in Europe and has also required intensive evaluation of protection realization and fault current investigation to maintain sufficient failure tolerance in the protection of the harness. The aspect of power bus stability was introduced through establishment of additional power quality requirements by NASA. ASTRIUM has developed a model of the APM power network on the basis of equipment level data and validation by tests on the integrated system. The model is used to demonstrate power bus stability.