space based solar power in general

1. SUBMITTED BY:
ANJANA.A.S

2.  What is SBSP?
 When the idea arised ?(History)
 How is it possible?(Design)
 What is its future use?
 What are the advantages of SBSP?
 What are the disadvantages of SBSP?

3.  solar energy is the energy generated due to the
thermonuclear fusion reactions occurring in the sun.
 space based solar power(SBSP) is the concept of
collecting solar power in space, using an “SPS” ,that is, a
“solar power satellite” or a “satellite power system ” for use
on earth.
 SBSP would differ from current solar collection methods
in that the means used to collect energy would reside on an
orbiting satellite instead of Earth’s surface.

4.  Originally known as satellite solar power system (SSPS) was fist
discovered in november 1968.
 1973 peter Glaser-granted US patent - transmitting power over long
distance -microwaves .
 1978 - 1981, the US congress authorized the Department of Energy(DoE)
and NASA to jointly investigate the concept.
 1997 NASA- “ fresh look “ study to examine the modern state of SBSP
feasibility.
 On Nov 2,2012, China proposed space collaboration with India in SBSP.

5. MICROWAVE POWER TRANSMISSION
EARTH
OUTER SPACE

6.  COLLECTION
SOLAR ENERGY REFLECTORS SOLAR CELL.
 TRANSMISSION
WIRELESS MICROWAVE/LASER
 RECEPTION
EARTH RECTENNA MICROWAVE ANTENNA

7.  Two basic concepts related to energy collection are
utilizing photovoltaics (solar panels)or solar thermal.
 One concept of solar thermal essentially captures
solar energy by using mirrors to concentrate light
and heat up a liquid.
 This in turn spins a turbine to generate electricity.
 This concept allows for a potential weight advantage
over solar panels as it could reduce overall mass per
watt.

8. 1.MICROWAVE POWER TRANSMISSION
2. LASER POWER BEAMING

9.  Power transmission via radio waves can be made more
directional, allowing longer distance power beaming, with
shorter wavelength of electromagnetic radiation, typically in
the microwave range.
 A rectenna may be used to convert the microwave energy back
into electricity.
 NASA study of solar power satellites required a 1-km
diameter transmitting antenna, and a 10-km diameter
receiving rectenna , for a microwave beam at 2.45 GHz.
 Experiments in the tens of kilowatts have been performed.
 Conversion efficiency under experimental conditions was
measured to be around 85% efficient.

10.  Allow transfer of power.
 Range of 10% to 20% efficiency.
 Eye and skin damage.
 Power can be transmitted by converting electricity
into a laser beam that is then pointed at a
photovoltaic cell.

11.  The earth based rectenna would likely consist of
many short dipole antennas connected via diodes.
 Microwave broadcasts from the satellite would be
received in the dipoles with about 85% efficiency.
 Rectennas would likely be several kilometers
across.

12.  Special type of antenna used to convert microwave energy into
direct current electricity
 Simple rectenna element consists of dipole antenna with RF
diode connected across dipole elements
 Diode rectifies AC current induced in antenna by microwaves,
to produce DC power, which powers load connected across
diode.
Dc –dc
converte
r
Control
Storage
LPF Load--------EM
source
Diode
Antenna

14.  Low cost environment friendly launch vehicles.
 Power transmission with minimal environmental
impact.
 SSP does not emit green house gases.
 More intense sunlight.
 Lack of obstructions.
 Satellite could be illuminated over 99% of time.
 Non-hazardous radiation.
 No power variation.

15. The most significant technical challenges are the
development of
 Low-cost, re-usable space access
 Dealing with launch costs .
 Demonstration of space to earth power beaming.
 Efficient and light space- qualified solar arrays.
 Space assembly,maintanance and servicing.
 Large in-space structure.

16. FACTORS SPACE BASED SOLAR
POWER SYSTEM
EARTH BASED SOLAR
POWER SYSTEM
1 EFFICIENCY 8-10 TIMES MORE LESS
2 EFFECT OF
EXTERNAL
CONDITION
NO EFFECT HIGH
3 EFFECT OF
EARTH’S
MOVEMENT
NO EFFECT UNABLE TO CAPTURE
ENERGY DURING
NIGHT
4 ENERGY LOSS NO LOSS DISTORTED ENERGY
WAVES

17.  Shaping the future with photovoltaics.
 Aerospace applications.

18.  Japan – world leader-SBSP projects.
 predicted-process 1gw power – similar-
nuclear power stations.

19.  In Japan scientist from Japan aerospace
exploration agency (JAXA) have planned a
series of pilot projects.
 Private companies with the goal of business
plan for SBSP.
 plan to have a test satellite in orbit in
approximately 10 years.
 Another SBSP company, solaren is planning
to generate 200 megawatt of electricity over
15 years beginning in 2016.

20.  www.wikipedia.com
 https://ieeexplore.ieee.org
 https://space.nss.org

21. THANK
YOU