Now, with the JAXA as the center, the production and education officials are cooperating in the research and development of "Space Solar Power Systems (SSPS)." The goal is to implement this system and use space technology to contribute to the energy sector. JAXA R&D headquarters did not go to the Center for Technology Research.
“This is an ambitious plan. The road to realization is indeed very long. But if you give up, everything is over. We are now only perseveringly moving towards the dream.â€
Researcher at the Research and Development Division of Japan Aerospace Development Institute (JAXA) did not step on the technical research center and he said firmly that Daejeon was helping.
Now, Hatoi and others are working on the development of a "space solar power system." If implemented, this system is expected to become the infrastructure that will shoulder the burden of future energy supply. Therefore, the “Energy Basic Plan†passed by the Japan Cabinet of Ministers in April 2014 and the “Universal Basic Plan†adopted by the Cabinet’s Space Development Strategy Division in January 2013 both included it and was implemented as a national policy.
Japan is at the top level in the world
Space solar power system, as the name suggests, refers to a power generation system that uses solar power in the space of the universe, converts the generated electricity into microwaves and lasers, transmits them to the ground wirelessly, and receives and converts electricity into electricity on the ground.
Although it sounds like a sci-fi movie, in fact, space-based solar power has a long history dating back to 1968. It was first proposed by the United States aerospace engineer Peter Glaser. The principle of wireless transmission of energy has been verified, and Japan is now the leader in this field.
Cosmic space is different from the ground, regardless of day or night, and is not affected by the weather conditions. Although natural energy can also generate electricity for 24 hours. Moreover, the universe has no air, no scattering and absorption of light. Therefore, the solar energy received by the solar panel is 5 to 10 times more than the ground.
Taking into account future technological developments, and estimating the energy conversion loss that will occur when transferring from space to the ground is about 50%, the solar panel unit area of ​​power generation can also be 2.5 to 5 times the ground. In addition, after the Great East Japan Earthquake on March 11, 2011, space solar power became a natural energy source that can replace nuclear power and thermal power generation as the basic power source, and its interest in Japan has increased dramatically.
Takashi Kazuya said with enthusiasm: "Now, Japan is the only country in the world to develop space solar power generation systems as a national policy, and plans are developed and joint research and development by industry and academy officials. The United States government has not carried out the country because of financial issues, policy guidelines, and other reasons. Continuity of research, therefore, Japan’s technological level in the field of space solar power systems is considered the best in the world.As a space solar power system researcher, I believe that I am engaged in solving energy problems for human beings. A meaningful study of contributions will hopefully lead the world and realize this system as soon as possible.â€
His dream is to realize a space solar power system and use space technology to contribute to the energy field.
Although the ambition is great, the topics to be overcome are piled up. "There are indeed a lot of issues." After some opening remarks, there were three major technical issues that JAXA encountered during the R&D process. The first is "microwave wireless energy transmission technology", the second is "laser wireless energy transmission technology", and the third is "large-scale structure assembly technology."
The basic technology being developed is roughly divided into three
Before introducing the contents and topics of these technologies, we first look at the overall structure of a space solar power system.
The system consists of two parts: a space solar power satellite set up in space and a receiving device set on the ground.
Space solar power satellites are equipped with solar panels, devices that convert direct current from solar panels into microwaves and lasers, and devices that transmit to the ground.
On the receiving equipment on the ground, there are devices and power converters that convert microwaves and lasers into direct current. The DC power of the converter is converted into AC power and transmitted to the existing commercial power grid.
JAXA officially began researching space solar power systems in 1998. Initially, the core characters of the study were Professor Emeritus of Kyoto University, the current president of the university, Matsumoto, and the deceased former Institute of Space Sciences (incorporated into JAXA in 2003), Professor Chang Youxin who returned from the United States in the 1980s. Solar power system concept.
So far, with the United States as the center, although dozens of space solar power generation systems have been proposed throughout the world, JAXA has spent more than 10 years designing and researching practical systems.
JAXA is still not sure whether to use microwaves or lasers to transmit electricity from the cosmos to the ground. The reason is that both are short and long. We are considering the use according to purpose. Therefore, JAXA is developing two kinds of energy transmission technologies in parallel and plans to conduct ground verification experiments by the end of 2014.
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