IEEE Paper submitted by,

Research Institute for Sustainable Humanosphere,

Kyoto University, Kyoto, Japan

Presentation by,

Harish Rajula

P14EC009

SOLAR POWER IS - INEXAUSTIBLE(RENEWABLE)

ENERGY RESOURCE.

We can, in fact directly convert solar energy into

electrical energy with the use of solar cells, but sunlight

diffuses at night time from the earth.

If the need arises for 24 hours power supply, we are

helpless.

The solution is wireless power transmission from

space through a system consisting of SPS (Solar Power

Satellite) and RECTENNA (RECtifying anTENNA) by

Microwaves

1 Higher efficient

2 Higher accurate

3 lighter weight

4 low cost

5 Phased array with huge number of antenna

elements. To control the beam direction for

effective commercial MPT

1. The phased array and SPS systems is not

stable

2. The satellite is vibrating with period of 14hours

and an amplitude of 80mt.caluculated from

computer simulations

3. The accurate target detection is not possible

4. They proposed a simulation method to correct the

position of sps.

5. PAC method(position and angle correction)

1) They measure the phase of the pilot signal on

the receiver antennas which are put on each

panel structure (as shown in Fig.3.)

2) They calculate the DOA from the phase data

of the received pilot signal and calculate the

inclination of the panel-structure.

3) They estimate the position of the panel

structure.

4) With the inclination and the estimated

position of the panel-structure and with

relationship of the adjacent panel.corrected the

position of the panel.

1.A 1100km altitude equatorial orbit will be used. This choice

minimizes the transportation cost and the distance of power

transmission from space.

2. If it was in GEO (that is, 35,800 kilometers from Earth) then the

receiving antenna would have to be 40 times larger.

3. So satellite has to orbit above the equator in order to have

frequent transmission opportunities. It transmits up to 10Mwatts of

radio-frequency power. Ten satellites placed evenly around the orbit

would require only nine minutes of storage capacity to provide

continuous power.

1. Unaffected by day-night cycle, weather or seasons. Optimized

advances may enable 24 hour power supply per day.

2. This is an eco-friendly, renewable and maintenance free

energy resource unlike the conventional fuels.

3. As the equipment is positioned in space, it is occupies no land

area and remains unaffected by harsh weather conditions.

Rectennas can share land with farms.

4. The spacetenna could direct energy to any rectenna on earth

within the range of its steering angle, which could satisfy the

energy requirements of all the equatorial countries.

5. Waste heat is re-radiated back into space, instead of warming

the earth…

1. Complexity—20 years to complete

2. Size—6.5 miles long by 3.3 miles wide

-Transmitting antenna ½ mile in diameter(1 km)

3. Cost—prototype would have cost $74 billion

4. Microwave transmission

-Interference with other electronic devices

-Health and environmental effects