PSP Bibliography




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Solar Probe Plus (SPP) spacecraft power system



AuthorRoufberg, Lew; Baisden, Carson;
KeywordsBattery management systems; Charging (batteries); Electric power system control; NASA; Orbits; Probes; Secondary batteries; Solar cell arrays; Space flight; Parker Engineering
AbstractThe Solar Probe Plus (SPP) mission, under NASA s Living with a Star program, will fly a spacecraft (S/C) through the sun s outer corona with orbit perihelia that gradually approach as close as 9.5 solar radii from the center of the sun. The mission will gather data on the processes of coronal heating, solar wind acceleration, and the production, evolution and transport of solar energetic particles. The S/C is powered by two actively cooled photovoltaic solar array (S/A) wings. Due to the extreme environments near the sun, the S/C body is protected behind a solar shield. A novel S/A control algorithm autonomously positions the wings to minimize the thermal load while maintaining adequate electrical power by shading the wings in the penumbra behind the solar shield and tilting the wings at a high angle of incidence to the sun. The S/A control imposes conditions and constraints on the electrical power system (EPS) design and operation. When close to the sun, the EPS must continuously perform S/A peak power tracking while avoiding any battery-limiting modes. Meanwhile, the battery must operate at a depressed state of charge and accommodate microcycling due to S/A power fluctuations. The trade studies involved in designing the EPS and the reasons for the concepts of operation are presented. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
Year of Publication2012
Journal10th Annual International Energy Conversion Engineering Conference, IECEC 2012
Volume
Number of PagesAmerican Institute of Aeronautics and Astronautics (AIAA) -
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