@inproceedings{oai:jaxa.repo.nii.ac.jp:00007911,
 author = {川崎, 治 and 辻田, 大輔 and 市川, 千秋 and Kawasaki, Osamu and Tsujita, Daisuke and Ichikawa, Chiaki},
 book = {第32回宇宙エネルギーシンポジウム, 32nd ISAS Space Energy Symposium},
 month = {Mar},
 note = {第32回エネルギーシンポジウム (2013年3月1日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, The Space Energy Symposium (March 1, 2013. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, H-II Transfer Vehicle (HTV) is an unmanned cargo transfer vehicle to the International Space Station (ISS) developed and built by JAXA. HTV delivers supplies to the ISS and planned to be launched seven in total. To approach the manned base ISS safely, HTV have to keep power distribution to its system even if at the worst situation. A common design approach for Electrical Power System (EPS) in past unmanned spacecraft was the Design for Minimum Risk such that the highly reliable single electrical bus provides power to the system. However, the single bus can mitigate the risk of the loss of bus but the possibility of the loss of bus can not be denied. HTV EPS promoted Failure Tolerant Design and achieved the ISS common requirement of Two Failure Tolerant for Safe. HTV EPS applied redundancy to the bus system and placed circuits around bus system not to propagate failures especially short circuits. HTV EPS consists of 120 V system and 50 V system. 50 V system maintains HTV function such as Guidance, Navigation and Control (GNC) system, Data Handling (DH) system, and Communication (COM) system. 120 V system received power from the ISS during the attached phase and provides power to the pressurized section of the HTV where the ISS crew can enter. 120 V system also convert power to 50 V system and keep HTV function during the attached phase. This paper gives an outline of HTV 50 V system, its characteristics, power control design and its operation and on-orbit data compared with simulation on ground. HTV is an transportation vehicle so that its recurring cost is one of the most important parameter in procurement. As an HTV improvement activity, authors evaluated HTV EPS design comparing on-orbit operation result with simulation on ground from the aspect of power balance between provision and consumption and had a success of optimization of amount of solar array in subsequent HTVs., 形態: カラー図版あり, 形態: PDF, Physical characteristics: Original contains color illustrations, Physical characteristics: PDF, 資料番号: AA0061912005, レポート番号: SES-2012-005},
 pages = {1--4},
 publisher = {宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)},
 title = {HTV電力系の軌道上運用による設計評価と高度化検討},
 year = {2013}
}