The document discusses wireless power transmission through solar power satellites (SPS). It describes how an SPS system would work, including using large solar panels in space to generate electricity, transmitting it via microwaves to a rectenna on Earth to convert it to direct current. An SPS could transmit power efficiently and reliably over long distances without wires. However, SPS technology remains more expensive than other energy sources currently and would require significant international cooperation and investment to develop fully.

1. Presented By:
shanmukh. j
11P7A0485.
WIRELESS POWER TRANSMISSION
THROUGH SPS (SOLAR POWER
SATELLITE)

2. WIRELESS POWER TRANSMISSION
(WPT)
Nicola Tesla proposed the theory of wireless power
transmission.
Transmission of energy from one place to another
place without using wires.
 Three main systems used for WPT :
• Microwaves
• Resonance
• Solar cells
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3. WHY WPT ???
 Reliable
 Efficient
 Fast
 Low maintenance cost
 Can be used for short range or long range
 Reduction of losses during transmission and distribution
of electrical energy.
 Need for grids, substations etc. are eliminated.
 Noble alternative for electrical transmission.
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4. TYPES OF WPT ...
There are mainly three major types of wireless energy transfer
 Short range – INDUCTIVE COUPLING
 Medium range – RESONANT COUPLING
 Long range power transfer – ELECTROMAGNETIC
RADIATION
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5. HOW SPS WORKS ???
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6. FLOW CHART OF SOLAR POWER
TRANSMISSION
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7. OVERVIEW OF SYSTEM DESIGN.....
It consists of :
I. Solar Panel.
II. Spacetenna ( antenna on satellite ).
III. Rectenna ( RECTifyin g anTENNA).
IV. Orbit selection Systematic view.
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8. SOLAR PANEL
 Set of solar photovoltaic modules electrically
connected and mounted on a supporting structure.
 Photovoltaic module is a packaged , connected
assembly of solar cells.
 Solar panels use photons(light energy) from sun to
generate electricity through photovoltaic effect.
 Solar panels were first used in space in 1958.
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9. SPACETENNA: (Antenna on Satellite)
 Spacetenna is a triangular prism with a length of 800 m and sides
of 100 m.
 The transmitting antenna on the horizontal under surface faces
the earth, and the other two sides of the prism carry solar arrays.
 The faces of prism are embedded with photovoltaic cells .These
cells would convert solar energy into electricity, which in turn
power onboard , Microwave Generator.
 The microwave thus produced travels through atmosphere &
collected by RECTENNAS on earth.
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10. CONFIUGRATION OF SPACETENNA..
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11. RECTENNA: (RECTIfying anTENNA)
 mesh of an array of dipole antennas
connected to diodes converting the
radio frequency signal into DC
voltage, which is then converted into
regular AC electricity which is wired
to homes, factories etc.
It can be considered as a base station
of Geosynchronous satellite.
Microwaves of 2.45 GHz frequency is
used to transmit power from satellite
to rectenna.
. A simple rectenna can be
constructed from a Schottky diode
placed between antenna dipoles as
shown in Fig.
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12. ORBIT SELECTION SCHEMATIC VIEW
In LEO, a 11,00 Km
altitude equatorial orbit will
be used. This choice
minimizes the transmission
cost and the distance of
power transmission from
space.
If it was in GEO ( that is
35,800 Km from the earth )
then the transmitting antenna
would have to be 40 times
larger than LEO one- or else
the receiving station would
have to be 40 times larger.
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14. 5,000 MW Receiving Station (Rectenna).This
Station is about a mile & a half long in US.
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15. WHY TO USE SPS ?
 More intense sunlight.
 Unlimited energy resource.
 Energy delivered anywhere in the world.
 Zero fuel cost.
 Zero co2 emission – environment safe.
 Waste heat is radiated back into space.
 No air or water pollution is created during the generation.
 Concept is simpler than the other most power systems here
on the earth.
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16. DISADVANTAGES...
 Transmitting antenna about 1.5 mile in diameter (1 km)
 Cost – prototype would have cost $74 billion.
 Interference with communication satellites
 Would require a network of 100’s of satellite.
 Heavy Launch cost
 The large scale of space solar power require international
financing.
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17. CONCLUSION...
 SPS is still more expensive than ground based solar
power & other energy sources. Yet even now, a small
SPS system could be economically justified to provide
unavailable emergency power for natural disaster
situations, urban blackouts & satellite power failures.
 For WPT via SPS to become reality, we require:
Government support.
Cheaper launch prices.
Involvement of private sector.
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