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Presented by
Shubham Jain
Wireless Power Transmission
0809010094 Department of Computer Science Engineering IEC College of Engineering and Technology, Gr.Noida
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Overview
What is wireless power transmission(WPT)? Why is WPT? 1940’s to Present Microwave transmission Rectenna Applications Space-based solar power SPS 2000
Advantages Conclusion References
Wireless Power Transmission
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What is WPT? The
transmission of energy from one place to another without using wires Conventional energy transfer is using wires As per studies, most electrical energy transfer is through wires. Most of the energy loss is during transmission On an average, more than 30% In India, it exceeds 40%Wireless Power Transmission
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Why WPT? Reliable Efficient Fast Low
maintenance cost Can be used for short-range or long-range. Wireless Power Transmission
1940’s to Present World
War II developed ability to convert energy to microwaves using a magnetron, no method for converting microwaves back to electricity 1964 William C. Brown demonstrated a rectenna which could convert microwave power to electricity
Microwave transmission
Microwave transmission refers to the technology of transmitting information by the use of radio waves whose wavelengths are conveniently measured in small numbers of centimeters; these are called microwaves. This part of the radio spectrum ranges across frequencies of roughly 1.0 gigahertz (GHz) to 30 GHz. These correspond to wavelengths from 30 centimeters down to 1.0 cm.
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Microwave Power Transfer(MPT) Cont.
Transfers
high power from one place to another. Two places being in line of sight usually Steps:
Electrical energy to microwave energy Capturing microwaves using rectenna Microwave energy to electrical energy Wireless Power Transmission
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MP T (cont.…) AC
can not be directly converted to microwave energy AC is converted to DC first DC is converted to microwaves using magnetron Transmitted waves are received at rectenna which rectifies, gives DC as the output DC is converted back to AC Wireless Power Transmission
Rectenna
“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. Around 5km across (3.1 miles) 95% of the beam will fall on the rectenna.
5,000 MW Receiving Station (Rectenna). This station is about a mile and a half long in US.
Applications
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Space-based solar power 1968’s
idea for Solar Power Satellites proposed by Peter Glaser Would use microwaves to transmit power to Earth from Solar Powered Satellites To
efficiently make use of renewable energy i.e., solar energy Solar Powered Satellites are placed in geostationary orbits Wireless Power Transmission
From the Satellite Solar
power from the satellite is sent to Earth using a microwave transmitter Received at a “rectenna” located on Earth
Possible Designs
Advantages over Earth based solar power More
intense sunlight In geosynchronous orbit, 36,000 km (22,369 miles) an SPS would be illuminated over 99% of the time No need for costly storage devices for when the sun is not in view
Only a few days at spring and fall equinox would the satellite be in shadow
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Other projects Alaska’21 Grand
Bassin
Hawaii Wireless Power Transmission
Current Developments
SPS 2000
Details Project
in Development in Japan Goal is to build a low cost demonstration model by 2025 8 Countries along the equator have agreed to be the site of a rectenna
Continued
10 MW satellite delivering microwave power Will
not be in geosynchronous orbit, instead low orbit 1100 km (683 miles) Much cheaper to put a satellite in low orbit 200 seconds of power on each pass over rectenna
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Advantages of Wireless energy transfer Efficient Easy Need
for grids, substations etc are eliminated Low maintenance cost More effective when the transmitting and receiving points are along a lineof-sight Can reach the places which are remote Wireless Power Transmission
Conclusions More
reliable than Traditional power In order for WPT to become a reality it several things have to happen:
Government support Cheaper launch prices Involvement of the private sector
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References
S. Sheik Mohammed, K. Ramasamy, T. Shanmuganantham,” Wireless power transmission – a next generation power transmission system”, International Journal of Computer Applications (0975 – 8887) (Volume 1 – No. 13) Peter Vaessen,” Wireless Power Transmission”, Leonardo Energy, September 2009 Wikipedia Wireless Power Transmission
