In pursuit of “endless energy”, US X-37B space plane begins to test, and a new competition begins

Foreign media published an article on November 25: will space power station become the next hot spot of competition? The race to use satellites to generate electricity and transmit energy has begun. < / P > < p > the European Space Agency (ESA) is assessing the feasibility of space-based solar power generation, and the UK has funded research on this technology, including solutions for launching power to long distances. The European Space Agency (ESA), which is seeking proposals for space power generation, said it would fund research on the technology, with beneficiaries receiving up to 175000 euros. Just this month, the UK carried out a study on space-based solar solutions, including the construction of giant satellites capable of converting the energy generated by photovoltaic panels into high-frequency radio waves and transmitting them back to earth. < / P > < p > and the United States has taken a big step in this field. The X-37B space plane, which was launched in May this year, is equipped with a photovoltaic RF antenna module designed by the US Navy laboratory. An official press release from the U.S. Department of Defense said the PV RF antenna module could “capture solar energy in space and transmit it back to earth in the form of RF microwave.”. On the surface, the design intention of the module is to obtain “inexhaustible” solar energy in space to power satellites, aircraft and ground equipment. < p > < p > we have all seen solar photovoltaic power plants built on the ground, but why should human beings build solar power plants in space? The main reasons are: the sunlight in space will not be affected by the atmosphere, which is at least 30% stronger than that on earth; there is only 12 hours of light on the earth, but there is light continuously 24 hours in space; the sunlight can be vertically directed to the battery array. In a word, space-based solar power generation system can greatly reduce the power loss caused by the day and night cycle, climate season, atmospheric filtering and the change of solar flux incidence angle. The available solar energy is more than 10 times of the earth’s surface, and the power generation efficiency is increased by 6-30 times or more. If the cost and engineering problems of space-based solar power can be solved, it may become a new way to solve the earth’s energy and environmental problems as a clean and safe energy. < / P > < p > in fact, the concept of space-based solar power stations was proposed more than 50 years ago. In 1968, American scientist Dr. Peter Glazer put forward the concept of “solar powered satellite” in the magazine. In the following decades, space agencies in the United States, Europe and Japan have carried out research. At present, the concept of space-based solar power generation system has been basically determined, which consists of three parts: solar power generation facilities, space transmission facilities, ground receiving and conversion facilities. The most mature of these three parts is solar power generation facilities. Solar photovoltaic array technology is the focus of current research. In theory, the solar energy in earth orbit can reach 1365w / m2. According to the efficiency of 20%, it needs about 3700 M2 solar array to generate 1 MW of energy, which is about 60 meters times 60 meters. It is not difficult to build such a satellite with current technology. However, there are still many technical problems in space transmission facilities and ground receiving conversion facilities. If the microwave transmission scheme is adopted, the satellite in geostationary orbit needs antenna diameter up to 1km, and the diameter of ground receiving antenna should also reach 10km. If satellites are deployed in low orbit, the antenna diameter can be greatly reduced, but the photovoltaic panel needs to change direction frequently, and more power station satellites are needed to meet the demand. According to the current aerospace technology, the cost of deploying space-based photovoltaic power stations is definitely much higher than that of ground-based photovoltaic power stations, and the cost-effectiveness ratio of power generation is far from competitive with that of ground-based photovoltaic power stations. However, the U.S. military is optimistic about the future of this technology because they need to deploy overseas. They must consider the situation that overseas bases can not get local power supply in wartime. At this time, space-based solar power generation is very attractive. In particular, the laser weapons and electromagnetic guns that the U.S. military is vigorously testing need sufficient power support. Once the problem of energy supply is solved, their deployment will not be too much restricted. The bases powered by space-based power stations and armed by laser guns and electromagnetic guns will appear in any desired areas. This is a very ideal scenario for the US military, but for its opponents It’s not that wonderful. < / P > < p > it is not only the United States and Europe that are interested in space-based solar power generation. Space agencies in Japan, Russia, Canada and India have similar research programs. Among them, Japan is the most active. As early as 1987, the Japanese Institute of space science established a research group on solar powered satellites. In 2005, Japan listed space-based solar power into the national long-term space development plan. Japan has adopted two ways to verify the feasibility of space-based solar power. The first is to install solar test-bed on the international space station by using the pressurization chamber of the Japanese experimental module, the exposure section of the experimental logistics module and other exposure facilities; the second is to launch a small technology verification satellite. In 2009, Japan launched a new microwave power transmission research project to verify the microwave power transmission and beam control technology for transmitting kilowatt power over a distance of 100 meters on the ground. < / P > < p > China is also closely tracking in this field. The space solar energy research center was set up in Northwest Polytechnic University. In 2017, the team of Northwest Polytechnic University won the second runner up of the international space solar energy student competition. In 2016, the “Qian Xuesen space technology laboratory” team of the Fifth Academy of China Aerospace Science and Technology Group has carried out specific research work on solar power plants, and is currently in the research and test stage. Although space solar power generation still looks like science fiction, it is possible to realize it in the near future with the efforts of major space agencies in the world. Continue ReadingXiaomi new machine real machine exposure center dig hole screen design or high color thousand yuan machine