Introduction of Multi-bus Tethered-SPS · 2017. 12. 1. · Fig.2 Integration of Tethered-SPS units...
Transcript of Introduction of Multi-bus Tethered-SPS · 2017. 12. 1. · Fig.2 Integration of Tethered-SPS units...
Fig.2 Integration of Tethered-SPS units by connecting panels.
Power Generation
(Upper Plane)
Power Generation/Transmission
(Lower Plane)
95 m
100 m
Microwave
Beam
5-10 km
Bus System
Tether Wire
Fig.1 A unit of Tethered-SPS.
Introduction of Multi-bus Tethered-SPS∗
S.Sasaki
The Institute of Space and Astronautical Science (ISAS)
Japan Aerospace Exploration Agency (JAXA)
3-1-1 Yoshinodai, Kanagawa 229-8510, JAPAN
The Tethered-SPS, consisting of a power generation/transmission panel suspended by tether wires, has
been studied for 5 years under coordination with university researchers (Kyoto University, Hokkaido
University, Kanazawa University, Shizuoka University, Tokyo Metropolitan University) and USEF
(Institute for Unmanned Space Experiment Free Flyer). Since this system does not track the sun, the total
power efficiency is 36 % lower than that for the sun-pointing type SPS even when the solar cells are
attached to both sides of the panel. However, the simple, technically feasible, and practical configuration
resolves almost all the technical problems in the past SPS models. Figure 1 shows a unit of Tethered-SPS,
in which a power generation/transmission panel of 100 m x 95 m is suspended by four 5~10 km tether
wires extended from a bus system. The weight is about 45 MT. The unit has a power transmission
capability of 2 MW. The units are connected to form a larger SPS as shown in Fig.2, depending on user
requirements. 1 GW-class SPS can be constructed by 25 x 25 unit assembly.
This simple and flexible configuration has many advantages, as summarized below;
(1) Since the attitude is stabilized automatically by the gravity gradient force, no active attitude control is
required.
(2) There is no moving structure, which makes the system highly robust and stable. Especially one-point
failure mode peculiar to the rotary mechanism is excluded.
(3) The system is composed of equivalent units, which enables the phased construction and leads to easy
integration and maintenance.
(4) The unit consists of equivalent power generation/transmission modules, which enables low cost mass
production.
(5) There is no wired signal/power interface between the modules, which leads to easy deployment of the
unit.
(6) Active thermal control is not required because of uniform distribution of the transmitting power.
(7) A scale model of the unit of the Tethered-SPS can be used for the demonstration experiment on the
ground and in orbit in the near future, which assures an evolutional scenario for the SPS development
from the initial demonstration to the commercial SPS.
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∗ Presented at the Eleventh SPS Symposium, 17-18 September 2008
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Construction Scenario for Tethered Solar Power Satellite. S. Sasaki, K.Tanaka, K.Higuchi, N.Okuizumi,
S.Kawasaki, M.Shinohara, and K.Ishimura, 57th International Astronautical Congress-2006, Valencia,
Spain (2006)�
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