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Stability of large DC power systems using switching converters, with application to the International Space Station

Conference ·
OSTI ID:474441
 [1];  [2]; ; ;  [3];  [4]
  1. Rockwell International, Canoga Park, CA (United States). Rocketdyne Div.
  2. Boeing Co., Seattle, WA (United States)
  3. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)
  4. National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
+ Show Author Affiliations

As space direct current (dc) power systems continue to grow in size, switching power converters are playing an ever larger role in power conditioning and control. When designing a large dc system using power converters are playing an ever larger role in power conditioning and control.When designing a large dc system using power converters of this type, special attention must be placed on the electrical stability of the system and of the individual loads on the system. In the design of the electric power system (EPS) of the International Space Station (ISS), the National Aeronautics and Space Administration (NASA) and its contractor team led by Boeing Defense and Space Group has placed a great deal of emphasis on designing for system and load stability. To achieve this goal, the team has expended considerable effort deriving a clear concept on defining system stability in both a general sense and specifically with respect to the space station. The ISS power system presents numerous challenges with respect to system stability, such as high power, complex sources and undefined loads. As a result, the program has derived an impedance specification approach for system stability. This approach is based on the significant relationship between source and load impedances and the effect of this relationship on system stability. This approach is limited in its applicability by the theoretical and practical limits on component designs as presented by each system segment. As a result, the overall approach to system stability implemented by the ISS program consists of specific hardware requirements coupled with extensive system analysis and hardware testing.

OSTI ID:
474441
Report Number(s):
CONF-960805--
Country of Publication:
United States
Language:
English

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Related Subjects

14 SOLAR ENERGY
24 POWER TRANSMISSION AND DISTRIBUTION
DC SYSTEMS
DC TO DC CONVERTERS
PHOTOVOLTAIC POWER SUPPLIES
STABILITY
SYSTEMS ANALYSIS