Wireless Power Transmission Technologies For Solar Power Environmental Sciences Essay

Abstract- The chief gradianuation of the cipher in our lifespan comes from fogey discharges, which is a non-re tenderable resource to a greater end thanover it produces racy sum of CO2. One of the solutions to inventionetary talent crises is development of geosynchronous rotate solar designer satellites ( SPS ) .It provides a clean and efficient beginning of vitality by roll uping the solar cater from infinite and so transporting it to the hide out. This is a new beginning of clean energy. Space solar world-beater aro apply work out our energy and nursery gas emanations jobs. Space solar source hatful supply hulking postings of energy to separately and every individual on Earth with really small environmental impact. The twitch mean spring per social unit country in infinite is 5-10 propagation larger than that on the background, sequence the author loss for the radio place transmission outline/reception is evaluate less than 50 % .This report provi des a reappraisal on the face uply formulated engineerings like atomize authority transmittance, laser spot transmission and the intercrossed susceptibilityiness infection remainss for transmittal of solar strength to the Earth from SPS. It be positionings talks most the personal effects on human wellness and environment due to SPS. Finally the paper suggests the development of a lucre board modelA for nuke ovenA radio power transmittal ( WPT ) . The intents of utilizing this borecole board theoretical account is to obtain a circumstantial directional bear of WPTA technologyA , which includes the direct sensing of rectenna turn ups, and the microwave oven radiotherapy control accomplishment with game angular preciseness, and to clear up the extension features of the microwaveA powerA in the ionosphere.KEYWORDS Microwave, Solar power battlefielder, wireless power transmittal.I. IntroductionEnergy and environment atomic number 18 superstar of the most of imp ort planetary issues which boast to be resolved to carry our society. 80 % of energy in our life comes by using fossil fuels. If we continue to utilize the dodo fuel resources at the up-to-the- minute phthisis rate, they testament be wholly over wi snub 100-150 r be ages. Furthermore, the immense sum of ingestion of fossil fuel pluss CO2 concentrations in the ambiance, which raises unsafe environmental issues. If we continue to depend on the dodo fuel, we result externalise significant debasement of life quality within this century. The emanation of unripe house gases besides leads to a figure of wellness jobs. Another beginning of energy is from atomic power, but the job of this beginning is the hazardous electric pig factors. The energy ingestion graph is shown in fig 1 6 . The planetary issues in the closed Earth system leave be efficaciously solved by a paradigm displacement to the opened earth- infinite system. The life clip of Sun is estimated as 4-5 billion o ld ages. There is limitless changeless solar energy supply in infinite free from conditions conditions, rather different from that on the Earth, therefore we can see solar power bailiwicker as a pertinacious term beginning of energy.The construct of the SPS is to tap the solar energy utilizing a large-scale photovoltaic cast in infinite and to convey it to the land utilizing ocular maser carry or microwave as shown in fig.2 6 . It has a great potency for a large-scale energy system to replace the dodo fuel workss. The clip mean power per unit country in infinite is 5-10 times larger than that on the land, while the power loss for the radio power transmittal and response is expected to be less than 50 % . Hence SPS has a competitory emolument over the solar power workss on the land.Solar power orbiter has the capacity to supply about all the galvanising demands of our planet. Furthermore it is common beginning of energy, it does non breathe any unsafe green house gases, an d it will non bring forth any risky wastes excessively, it will supply power 24 hours a twenty-four hours 7 yearss a hebdomad in immense measures and it works irrespective of cloud screen, daylight or divagate velocity. But it requires heavy developmental cost.The SPS was foremost brought up by diaphysis Glaser in 1968, fol pitiableed by NASA/DOE surveies in the 1970 s. Since the early probes, different types of the SPS have been proposed, more than 30 in the universe. Most of the SPS theoretical accounts proposed so farthermost uses microwave instead than opthalmic maser for the radio power transmittal, because the power, strength two at the sender and receiving system is by and large higher and fading through the ambiance is lower for microwave as seen with that of optical maser.II. microwave oven POWER TRASMISSION FOR SPSMicrowave frequency for SPS has been selected in a scope of 1-10 gigacycle, compromising surrounded by atmospherical fading and antenna size of it. Fig. 3 5 illustrates the constellation of infinite solar power systems dwelling of SPS and associated land sections. If we choose a frequence in the industrial, scientific and medical ( ISM ) wireless sets, 2.45 or 5.8 GHz argon the workable campaigner. 2.45 GHz was selected in the early horizontal surface survey, but 5.8 GHz has been late chosen as a more desirable frequence due to recent accelerated advancement in C-band RF engineering. The microwave power transmittal system has the undermentioned map, i.e.1 ) First the alteration of direct power from photovoltaic cell to micro-cook power.2 ) Followed by the formation and control of microwave beam aimed to fixed location inEarth.3 ) Last roll uping the microwave energy and change overing it into electrical energy on theEarth surface.Therefore the microwave WPT system consists of a sender ( in infinite ) , beam control mechanism and having celestial system ( on the Earth ) . As for the microwave generator, tubings such(prenominal) as magnetron, klystron, and TWT have been proposed for the SPS usage because the power transition talent is well high more than 70 % at low cost.Semiconductor amplifier is another possible campaigner as the power efficiency has been moderately improved to 60-70 % with low cost outlook. Besides the power efficiency, beam indicating engineerings to convey the microwave power beam exactly to the receiving locations be indispensable for the power transmittal. They are comic to the radio power transmittal, non covered by the bing communicating engineerings. A beam angle 100 I?rad with a 10 I?rad indicating truth is required for the 5.8 GHz transmittal from an frolic about of 2 kilometers square in the geosynchronous orbit to a response site of 3.5 kilometers diameter on the land. The conveying gossamer will be assembled by a figure of array aerial panels which consist of sub-array aerials. Wholly more than 1 billion aerials will be installed as in Fig.4 6 .A retro-directive engin eering with a pilot signal from the land will be used to command the microwave beam from distributively aerial panel directing to the land station. Although each panel is sufficiently set for microwave beaming, comparative gesture between the panels can non be avoided for the big aerial assembly. In order to organize a microwave beam exactly focused at the land station, the stage of microwave from each panel needs to be adjusted between the panels, which requires radical new engineerings. In the absence of the pilot signal, sender will automatically diphase its power beam and the peak power closeness lessenings by the ratio of the transmission elements. Still small spot of energy is lost due to side lobes which are caused by diffraction. To avoid this loss we have to do having aerial of really big size to suit the side lobes, which is practically non possible.The microwave power at the having site is rectified to supply dc power utilizing arrays of rectifying aerial ( rectenna ) as shown in Fig.5 6 with Schottky rectifying tube. The power transition efficiency for individual rectenna exceeds 80 % in a power scope more than 50 mW. However, farther research is required to better the power efficiency for 1 mW class input and rectenna array as a whole. We use Schottky rectifying tube since it has lowest electromotive force bead and highest velocity of operation, hence waste least sum of power due to conductivity and shift. Presentation of microwave power transmittal towards SPS on land and on a teeny orbiter or on the planetary Space Station.III. LASER radio receiver POWER TRANSMISSIONSatellite and system architectures ground on optical maser radio power transmittal were foremost considered earnestly during the SPS Exploratory Research and Technology ( SERT ) plan 6 . Laser systems have one major advantage for power transmittal which is the aperture aggregation efficiency. Whereas microwave power transmission and receiving aerials are size in kilometres , laser systems can be sized in metres. A secondary advantage is that optical maser based systems lend themselves more right away to incremental developments than microwave based systems. However, the major hurdle that optical masers based systems face is atmospheric losingss particularly due to the rain fading. To supply continual power, which would be required to measure up SPS as base excite power coevals, the optical maser system would all confine to hold large land energy storage capableness or multiple sites regain sufficiently far apart such that one of the sites would be accessible at all times.With the lower delivered power per site design standards of the current surveies compared to the DOE/NASA mention system, beam safety has minimum influence on the design of a microwave based solar power orbiter system, nevertheless, it has been a major factor for optical maser based systems. To cover with optical maser oculus and skin impression bounds, a system of geostatio nary heap of optical maser orbiters are distributed uniformly through a sufficient upstanding angle of infinite, with the beams from the orbiters spread uniformly over the 600m diameter photovoltaic array having site. With such a system, it is possible to keep safety criterions and still present IR visible radiation ( 1.03I?m, 1.06I?m ) with a septuple addition in power denseness over natural sunshine. Practical acknowledgment of such a system is through a HALO orbit in which the orbiters appear to travel in a round orbit about a fixed point in infinite. Individual orbiters would hold multiple solid- resign optical masers powered by photovoltaic arrays.Lasers are dispersed among photovoltaic cells to minimise power direction. Light is beamed straight to the Earth or collected by mirrors or through fiber optics to a cardinal guidance mirror and so beamed to the Earth. A fresh barrage to get the better ofing weather break of optical maser based power beaming is to utilize the beam ed power to hive away energy at the having site for ulterior transit. A low-earth-orbit ( LEO ) orbiter would utilize a concentrator Federal solar. Integrated Symmetric Concentrator with concentrator mirrors, photovoltaic arrays and microwave sender record player record ( 500m in diameter ) pumped laser to present 10MW of optical maser energy focused into a armored combat vehicle of brine incorporating Ti dioxide as a accelerator to divide the H2O into its division H and O. Hydrogen can be used as fuel or it can be reacted with CO2 to do methane 1 .IV. pelf LASER-MICROWAVE WIRELESS POWER TRANSMISSIONLaser and micro-cook wireless power transmittal each have alone advantages, i.e. , optical masers require littler apertures and microwaves are about immune to rain and other atmospheric conditions. Proposals are made to commingle the two options such that each would run in its most beneficial environment. The key to the design proposal is a platform operating in the stratosphere at about 20km tallness. Lasers can be used to beam power from orbiters at geostationary orbit through infinite ( no atmospheric fading ) to a photovoltaic array on the platform. The power would so be retransmitted with microwaves from the platform to a land rectenna. This would minimise both the size of the orbiter sender and land receiving system for an all-weather transmittal system. Drawbacks to such a system include efficiency losingss due to the conversion/retransmission measure and the likeliness of transcending microwave beam power denseness safety criterions. Fig. 6 1 depicts the schematic of SPS.V. ENVIRONMENTAL AND HEALTH CONCERNSAn appraisal of the SERT Program by the US content Research Council 5 has recommended more accent and blowup of its environmental, wellness, and safety attempts, in order to reexamine the environmental, wellness, and safety jeopardies of the design. It is besides necessary to analyze the biological deductions of SPS-WPT. To guarantee environ mental wellness and safety, the SERT Program has extra the center-of-beam power densenesss to the scope of 100-200W/m2( 10-20 mW/cm2 ) for both microwave and seeable light transmittal. For WPT, the microwave power denseness is projected to be 1.0 W/m2 ( 0.1 mW/cm2 ) at the edge of the rectenna.The ANSI/IEEE criterion 6 for maximal allowable human exposure to micro-cook radiation at 2.45 GHz is 81.6 W/m2 ( 8.16 mW/cm2 ) averaged over six min and 16.3 W/m2 ( 1.63 mW/cm2 ) averaged over 30 min, severally, for controlled and uncontrolled environments. The controlled and uncontrolled state of affairss are distinguished by whether the exposure grapples topographic point with or without noesis of the capable person and is usually interpreted to intend persons who are occupationally exposed to the microwave radiation, as contrasted with the general populace. Clearly, beyond the margin of the rectenna, the possible exposure, for either the CERT or Reference System, would be good be low that presently allowable to the general populace. The SPS-WPT system, proposed by Japan s METI, will be intentional to hold a land degree microwave power denseness lower than those emitted by cellular nomadic telephones. Cellular telephones operate with power densenesss at or below the ANSI/IEEE exposure criterions 7 . Thus, public exposure to the SPS-WPT Fieldss would besides be below bing safety guidelines.At the centre of the microwave beam, power densenesss would be greater than the allowable degree of exposure for controlled state of affairss. Except for care forces, human exposure would usually non be allowed at this location. In the instance of occupationally required presence, protective steps, such as spectacless, baseball mitts, and garments, might be used to cut down the exposure to a allowable degree. However, above the rectenna, where the power denseness is about 250 W/m2 ( 25 mW/cm2 ) , research in support of the Reference System has found that some birds exhibi t grounds of sensing of microwave radiation. This suggests that migratory birds, winging above the rectenna, might endure break in their flying waies. Furthermore, at higher close temperatures, larger birds seem to see more heat emphasis than smaller 1s, during 30 min of exposure 5 .This extra heat, from micro-cook energy deposited inside their organic structure, will emphasize their thermic regulative capacity.VI. scribble BOARD MODEL AND FUTURE SCOPE OF COMMERCIAL SPSThe staff of life board theoretical account is formed by a thin panel construction with a thickness of 6 centimeter, and the panel consists of aA transmittal aerial bed, microwave elaboration bed and thermic radiation bed, severally. Performances of the bread board were measured and evaluated. Additionally, the microwave beam maneuvering essays by the package retro-directive mode were demonstrated. A Performances of the bread board were measured and evaluated. Thermal transeunt features of the bread board theore tical account were simulated.A engineering roadmap from research stage to moneymaking(prenominal) stage is shown in Fig.7 5 . Based on the consequences from the pocket-size first appearance experiments in infinite, together with the consequences from the land experiments, we will do a determination on the engineering option, microwave or laser, for the radio power transmittal. With the selected transmittal medium, we will do a 100 kW-class SPS presentation experiment in orbit before 2020. All basic engineerings required for the commercial SPS will be verified at this phase. This attack is in consistency with the basic program on infinite development by the political science s infinite development scheme headquarter in Japan. After cessation of these presentations Japan will choose a constellation for the initial mark of the commercial SPS. The expected power cost depending to a great extent on the development of infinite transit and public credence will be the major trade off factors for choice. For the selected constellation, 2 MW and 200 MW category works will be constructed and tested before 2030. This scenario guaranties the start of grammatical construction of the 1 GW category commercial SPS in 2030 s.VII. DecisionOne of the most critical engineerings for the SPS is microwave power transmittal from the geosynchronous orbit to the land. Evolutionary microwave engineerings are required for high power transition efficiency more than 80 % from/to DC and an highly high-precise beam control with 10 I?rad truth. These engineerings will be partly verified in the land presentation experiment within several old ages and will be to the unspoilt verified in the infinite experiments within 10 old ages. Although the needed engineerings are rather ambitious, go oning research activities along with the proposed roadmap will take to opening the new SPS epoch in 2030 s.VIII. Reference 1 C.A. Schafer, D. Gray 16 May 2012, contagion media appropriate laser-microw ave solar power orbiter system 61st IAC, Prague. 2 J.C. Lin, 1997 Biological facets of nomadic communicating Fieldss, Wireless Networks, vol. 3, pp. 439-453 3 National Research Council, 2001, Puting the foundation for infinite solar power An appraisal of NASA s infinite solar power investing scheme, Washington DC 4 P.E.Glaser, 1968, Power from the Sun Its Future , Science, vol.162, pp.867-886. 5 Susumu Sasaki, Koji Tanaka, 2011, Wireless Power Transmission Technologies for Solar Power Satellite , International communicating conference IEEE. 6 S.Sasaki, K.Tanaka and Advanced Mission Research Group, Sep.-Oct. 2010, SSPS Technologies Demonstration in Space , IAC-10.C3.4.1, 61st International Astronautical Congress, Prague. 7 S.Sheik Mohammed, K. Ramasamy, T. Shanmuganantham, 2010, Wireless Power Transmission A by-line Generation Power Transmission System IEEE International Journal of ready reckoner Applications 8 Timothy J.Wickenheiser The Interagency Advanced Power Group , Available at & lt hypertext transfer protocol //iapg.grc.nasa.gov/iapg/ & gt Accessed on 30 Dec 2012 9 The make up of Electrical and Electronics Engineers, Inc. 8 Dec 1998, Standard for Safety Levels with Respect to humanity Exposure to Radio Frequency Electromagnetic Fields 3 kilocycle to 300 GHz , IEEE std C95.1 1999 edition