29-06-2013, 02:28 PM
Seminar on Wireless PowerTransmission (WPT)
Wireless Power.pptx (Size: 1.1 MB / Downloads: 59)
Introduction of WPT
As per studies, most electrical energy transfer is through wire
Most of the energy loss is occur during transmission
On an average, more than 30%
WPT system can be viewed as a system that transfers electrical power from one location to another location without support of actual cables or wire with very high efficiency
History
The term “ wireless power transmission” is first created by Nikola tesla in 1899
Nikola tesla is called as” father of wireless”
He able to light lamp over 25 mile away from source without using wire
In 1964 William brown established microwave to electricity conversion
In 1968 NASA introduced solar power satellite
In 1983 rocket experiment is demonstrated in Japan
In 1987 ,fuel free airplane is flew at canada
Microwave Power Transmission (MPT)
In MPT microwave is used for transmission
In MPT efficiency is good (55-75%)
Antenna size is large(500GW)
Transmitting antenna size is 1km long
Rectenna size is 1km long
Does not affect on human and animal
Generally 2.45GHz to 5.4GHz frequency is preferred into transmission
LASER power transmission
Narrow beam cross section area for energy transmission over large range
No interference problem is occur with communication line
Efficiency is low(20 to 50%)
Laser radiation can blind the people and animal at low power
At high power kill the people due to localized spot
Atmospheric losses
Solar power satellite(SPS)
SPS is a technology that utilize the sun’s energy twenty-four hours a day, that works not only when we have daylight, but also at night, during rain and even on cloudy days.
A more efficient way to gather solar energy is to launch satellites into orbit around the Earth, where the satellites can capture solar energy, change it into another wavelength and send it to Earth where power stations convert it into usable electricity
GROUND SEGMENT RECEPTION(rectinna)
The SPS system will require a large receiving area with a Rectenna array and the power network connected to the existing power grids on the ground. Although each rectenna element supplies only a few watts, the total received power is in the Gigawatts (GW).A Rectenna may be used to convert the microwave energy back into electricity. Rectenna conversion efficiencies exceeding 95% have been realized
Conclusion
Transmission without wires- a reality
Efficient
Low maintenance cost. But, high initial cost
Better than conventional wired transfer
Energy crisis can be decreased
Low loss
In near future, world will be completely wireless