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CONTENTS.... WPT basics.

Types of WPT.

Difference b/w microwave and laser transmission. SPS - working, flow chart.

Overview of system design.

Conclusion.

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 WIRELESS POWER TRANSMISSION

(WPT)

  Nicola Tesla proposed the theory of wireless power

transmission.

  Transmission of energy from one place to anotherplace without using wires.

 Three main systems used for WPT :

• Microwaves

• Resonance

• Solar cells

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WHY WPT ??? Reliable

Efficient

Fast Low maintenance cost

Reduction of losses during transmission anddistribution of electrical energy.

Need for grids, substations etc are eliminated.

Noble alternative for electrical transmission.

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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

 Microwave methodLaser method

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Microwave vs. Laser TransmissionMICROWAVE LASER

Transmission via radio waves.

More developed.

High efficiency upto 85%.

Cause interference with satellitecommunication industry.

Losses occur due to Atmosphericabsorption and scattering byclouds, fog, rain etc is less.

transmission via laser beam.

Recently developed.

 Allows the efficient transmission ofpower (40-50%).

Confirms to limit an eye and skindamage.

 Atmospheric absorption andscattering by clouds, fog, rain etccauses up to 100 % losses.

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  ... SPS ...

... SOLAR POWER SATELLITE ...

Solar Power Satellites (SPS) have proposed to collect solarenergy in space and then beam it down to earth.

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 HOW SPS WORKS ???

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 FLOW CHART OF SOLAR POWER TRANSMISSION

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OVERVIEW OF SYSTEM DESIGN.....It consists of :

I. Solar Panel.

II. Spacetenna ( antenna on satellite ).

III. Rectenna ( RECTifyin g anTENNA). 

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NEHA SLATHIA, 311/10 from MIET 12

RECTENNA

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, ece v ng a on(Rectenna).This Station is about a mile

& a half long in US.

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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 hereon the earth.

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...... SPS doesn’t use up the valuable surface area on the

earth.

Solar radiation can be more efficiently collected.

Space gets full power 24 hours a day. No effect of storms.

Eco- friendly and maintenance free energy resource.

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DISADVANTAGES...

Issues identified during DOE study :Complexity – long years to complete.

Size- 6.5 miles long by 3.3 miles wide.

 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 requireinternational financing.

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CONCLUSION... SPS is still more expensive than ground based solar

power & other energy sources. Yet even now, a smallSPS system could be economically justified to provideunavailable emergency power for natural disastersituations, 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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