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Spacecraft Power Systems

Spacecraft Power Systems. Spacecraft Power Systems. Power Source Table 11-33 compares common s/c power sources Photovoltaic Cells Cell types Sizing (Peak and Average Power) Radiation Environment Thermal Environment Shadowing Mission life Degradation characteristics.

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Spacecraft Power Systems

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  1. Spacecraft Power Systems

  2. Spacecraft Power Systems • Power Source • Table 11-33 compares common s/c power sources • Photovoltaic Cells • Cell types • Sizing (Peak and Average Power) • Radiation Environment • Thermal Environment • Shadowing • Mission life • Degradation characteristics

  3. Spacecraft Power Systems • Power Source • Radioactive Power Sources • Radioisotope Thermoelectric Generators (RTGs) • Nuclear Reactor • Dynamic Power Sources • Brayton, Stirling, Rankine cycles • Fuel Cells • Energy from oxidation reactions • High efficiency, short duration missions

  4. Spacecraft Power Systems • Energy Storage • Physical Constraints • Size • Mass • Operating position • Static and dynamic environments • Programmatic Constraints • Cost • Mission • Power required, eclipse frequency and length • Reliability • Maintainability

  5. Spacecraft Power Systems • Energy Storage • Electrical Constraints • Voltage • Current Loading • Duty cycles (length and frequency) • Depth of discharge • Activation time

  6. Spacecraft Power Systems • Power Distribution • Cabling • 10-25% of power system mass • Volume and location constraints • Fault Protection • Detection • Isolation • Correction • Switching • Subsystems require different amounts of power at different times • Power from batteries, arrays, RTG’s etc.

  7. Spacecraft Power Systems • Power Regulation and Control • Peak Power Tracking (PPT) • Non-dissipative • DC-DC converter in series with solar arrays • Direct Energy Transfer (DET) • Dissipative • Shunt regulator in parallel with arrays

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