solar power satellite - copy

8/2/2019 Solar Power Satellite - Copy

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Solar Power Satellite and

Microwave Power Transmission

ByNaveen S

08E31A0436

Guide

Dr. B. Visvesvara Rao

Professor


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Outline

Solar Power Satellite

Purpose of SPS

Construction of SPS


Advantages

Conclusion


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Solar Power Satellite


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Liquid fossil fuels maypeak before alternativescome on line causinginability for supply tomatch demand, shortages

& economic shock,instability, and greatpower competition

Energy growth tracks vs population & demand

Purpose of SPS


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Sourceource Cleanlean Safeafe Reliableeliable Base-loadase-loadFossil Fuelossil Fuel NoNo YesYes Decades remainingDecades remaining YesYes

Nuclearuclear NoNo YesYes Fuel LimitedFuel Limited YesYesWind Powerind Power YesYes YesYes IntermittentIntermittent NoNo

Ground Solarround Solar YesYes YesYes IntermittentIntermittent NoNoHydroydro YesYes YesYes Drought; Complex SchedulingDrought; Complex Scheduling

Bio-fuelsio-fuels YesYes YesYes Limited Qty Competes w/FoodLimited Qty Competes w/FoodSpace Solarpace Solar Yeses Yeses Yeses Yeses

Following wood, coal, and oil, the 4th energy must beNon-depletable - to prevent resource conflictsEnvironmentally clean to permit a sustainable future[Continuously] Available to provide base-load securityfor everyone

In a usable form to permit efficient consumption &minimal infrastructureLow cost - to permit constructive opportunity for allpopulations

Continued


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Construction of SPS

The surface of SPS havebeen covered with 400million solar cells & it has a

transmitter

The transmitter consists ofDC to RF power converters &transmitting antennaThe transmitting antennaon the satellite would havebeen about 1 km indiameter and consists ofarray of parabolic reflector

antennas


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Power gets to Earth through micro waves

The conversion of direct powerfrom the photovoltaic cells, tomicrowave power on the satellites

on geosynchronous orbit abovethe Earth

The formation and control ofmicrowave beam aimed precisely

at fixed locations on the Earthssurface

The collection of the microwaveenergy and its conversion into

electrical energy at the earthssurface


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continued

The conversion of dc to microwave isdone by dc to RF coverters. Generallyused dc to RF converters aremagnetrons,klystrons, solid stateamplifiersThe microwave power output of themagnetron is channeled into an array ofparabolic reflector antennas fortransmissionThe angle of divergence of beam

depends on the size of transmittingantennaThe power would be beamed to theEarth in the form of microwaves at afrequency of 2.45 GHz


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continued

Rectenna is the microwaveto dc converting device and ismainlycomposed of a receiving

antenna and a rectifyingcircuit

Microwaves are receivedwith about 85% efficiency

Around 5km across(3.1miles) 95% of the beam willfall on the rectenna 5,000MW Receiving Station (Rectenna).

This station is about a mile and a halflong.


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continued

A simple radio control feedback system operating in FM band

provides an appropriate control signal to the magnetron for adjustingits output level with fluctuation in the consumers demand at thereceiving side


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Advantages

If the largest conceivable space power station wasbuilt and operated 24 hours a day all year round, it

could produce the equivalent output of ten 1 millionkilowatt-class nuclear power stationsLong PaybackNo Fossil Fuel FeedRenewable

No pollutionHeat spread into the space and global warming isreduced


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Conclusions

More reliable than ground based solar power

Green electronics is possible throw SPS

The main barrier to the development of SPS is social,not technological

In order for SPS to become a reality it several thingshave to happen Government support Cheaper launch prices Involvement of the private sector

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