Title :
Energy balance analysis of small satellite in Low Earth Orbit (LEO)
Author :
Jang, Sung-Soo ; Choi, Jaeho
Author_Institution :
Chungbuk Nat. Univ., Cheongju
Abstract :
In general, satellite electrical power system plays an important role in its mission performance. To perform the mission successfully, the satellite should be provided with the sufficient power until end-of-life (EOL). To supply the sufficient power, it is not easy to install of larger power generation and storage source with power control units on satellite. Also, the thermal control is difficult in the space. The various technologies have been developed to reduce the satellite power sizing and to design power efficiently. The peak power tracking (PPT) method has been developed for spacecraft power system to use maximum available power of solar array. In general, to compensate for the solar cellpsilas degradation at EOL in satellite, the solar array will be designed with big enough margin. And, when the spacecraft exits eclipses, the peak output power of a solar array becomes very higher than its peak output power in the normal sunlight operation power. As a result, the spacecraft power system should dissipate high excess power through shunt regulators in the beginning of mission and after eclipse exit. To avoid the high power dissipation in the beginning of life and to utilize maximum available power after eclipse exit, the PPT is used in many recent spacecraft. Particularly, this PPT method is useful for the spacecraft in lower orbit because it goes through a large number of eclipse.
Keywords :
artificial satellites; solar power satellites; space power generation; end-of-life; energy balance analysis; high power dissipation; low earth orbit satellite; peak power tracking method; power control units; power generation; satellite electrical power system; shunt regulators; solar array; spacecraft power system; storage source; thermal control; Degradation; Low earth orbit satellites; Power control; Power generation; Power supplies; Power system analysis computing; Power systems; Regulators; Space technology; Space vehicles; Electrical power system (EPS); End-of-life (EOL); Peak power tracking (PPT); Satellite;
Conference_Titel :
Power and Energy Conference, 2008. PECon 2008. IEEE 2nd International
Conference_Location :
Johor Bahru
Print_ISBN :
978-1-4244-2404-7
Electronic_ISBN :
978-1-4244-2405-4
DOI :
10.1109/PECON.2008.4762613