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SUBMITTED BY:-PRANAV KUMAR1307083EEE-2

Brief study of WIRELESS POWER TRANSMISSON

Introduction to SOLAR POWER SATELLITE

Overview of system design

How SOLAR POWER SATELLITE works

Advantages & Disadvantages

Conclusion

References

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The transmission of energy from one place to anotherwithout using wires. Conventional energy transfer is usingwires. But the wireless transmission is made possible byusing various technologies.

This Phenomena is also known as ‘Witricity’.

The three main systems used for WPT are

Power Transmission using Inductive Coupling

Wireless Power Transmission using Microwave

Wireless Transfer of Solar power

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As per the studies , most electrical energy transfer is through

wires and most of the energy loss is during transmission through

wires. On an average , the loss is more than 30% in world. In

India, the loss exceeds 40%.

Getting rid of bulky wired networks.

Reduced cost of cables.

Need for battery is eliminated.

Maintenance cost is reduced.

More secure, no risks of getting severe shocks

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Human beings or other objects placed between the

transmitter and receiver do not hinder the transmission

of power.

Magnetic field tend to interact very weakly with the

biological tissues of the body, and so are not prone to

cause any damage to any living being.

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Ground based power transmission

(GPT)

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Space based power transmission

(SPT)

SPT is preferred over GPT because:-

1. Energy is available 24 hours a day.

2. No storage required for nighttime power.

3. The energy available in space is 4 -5 times than on earth.

4. No long winter nights, no storms, no cloudy seasons.

The SPS is a gigantic satellite designed as an electric power plant orbiting

the geostationary earth orbit.

It consists of mainly three segments solar energy collector to convert the

solar energy into DC electricity, DC to microwave converter and larger

antenna array to beam down the microwave power to the ground.

WHY SOLAR POWER SATELLITE ???

Increasing global energy demand.

Environmental problems due to fossil fuels.

To overcome energy crisis.

Overcome day and night effect and other factors such as cloud.

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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.

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Spacetenna is a triangular prism with a length of 800 m and sidesof 100m. The faces of prism are embedded with photovoltaic cells.These cells would convert solar energy into electricity, which inturn power onboard , Microwave Generator.

The microwave thus produced travels through atmosphere &collected by RECTENNAS on earth.

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An antenna comprising a mesh of dipoles and diodes for

absorbing microwave energy from a transmitter and converting it

into electric power. Microwaves are received with about 85%

efficiency and 95% beam will fall on the Rectenna.

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5000 MW RECEIVING STATION IN USA

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ADVANTAGES The realization of the SPS concept holds great promises for solving

energy crisis.

No fuel required.

Unlimited energy resource.

Zero Carbon-dioxide emission.

Solar energy can be more efficiently collected in space.

Elimination of plant and wildlife interference.

DISADVANTAGES

Interference with communication satellites.

The entire structure is massive.

High cost and require much time for construction

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More reliable than ground based solar power.

In order for SPS to become a reality several things have to

happen:

1.Government Support

2.Cheaper launch prices

3.Involement of private sectors

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Ralph H. Nansen solar power industries “WIRELESS

POWER TRANSMISSION :The key to solar power

satellites” IEEE AES system magazine , January 1996.

Kaya, N., S. Ida, Y. Fujino, and M. Fujita, “Transmitting

antenna system for airship demonstration of Space Energy

and Transportation” IEEE Vol.1.

Transmission Technology”, IEEE Microwave Magazine,

December 2002.

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