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SPACE BASED SOLAR POWER College Of Engineering Chengannur 1 Vinay Chandran S 7 – A Roll No. 49

Why Solar Power ?:

Why Solar Power ? Energy and environment - important global issue to be resolved 80% of energy – from fossil fuels Fossil fuel resources 100 – 150 years Increase in Co2 concentration Serious environmental crisis College Of Engineering Chengannur 2

Solar Energy:

Solar Energy The Sun- Earth’s primary source –renewable energy. Radiates 2.3 billion times more than received on earth. Energy from sun in 1 hour – provide all of earth’s population – energy needs for 1 year. More and more cells on earth – cannot create solar energy- this magnitude. Global problem – effectively solved – paradigm shift to the open earth system. College Of Engineering Chengannur 3

PowerPoint Presentation:

What is Space Solar Power? Solar Energy - captured - large photovoltaic arrays - transmitted - microwave - Earth receiver - converted into electric power. Sunlight captured in space is many times more effective - compared to a solar array on the Earth Solar Intensity 1,366 W/m 2 No Night College Of Engineering Chengannur 4 Night loss Weather loss

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PowerPoint Presentation:

How it works Solar panels on satellite capture light, sends power to earth using microwave wireless power transmission technology Signal sent from receiving antenna on earth (green) allows satellite to pinpoint it’s microwave beam. College Of Engineering Chengannur 6

PowerPoint Presentation:

Components of an SPS in Orbit : The Solar Collector array - consists of photovoltaic film . Power from the collectors - via conducting cables – microwave generating device . Microwave – transmitted – antenna. The Transmitting Antenna is a disk about 1 km across. It sends power to the ground 37,000 miles below. The Rectenna (Receiving antenna) is an array of fixed wire dipole antennas covering an oval area on the ground. Efficiently captures microwave energy - converted into usable grid electricity . College Of Engineering Chengannur 7


Transmission Microwave generator – magnetron, TWT, klystron – have been proposed – power conversion efficiency high – more than 70%. Microwave power – rectified to DC power – using rectenna (rectifying antennas). Rectenna - An antenna comprising a mesh of dipoles and diodes for absorbing microwave energy from a transmitter and converting it into electric power. College Of Engineering Chengannur 8

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Integral Symmetrical Concentrator College Of Engineering Chengannur 10


Limitations.. Launch costs very high – compared to lower orbits. Transmitted energy – absorbed/reflected – ionosphere. Also due to high path loss – 37,000 Km distance. Location - size of construction for the rectenna is massive . College Of Engineering Chengannur 11

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Space Based Solar Grid(SBSG):

Space Based Solar Grid(SBSG) Solar Power network. Consist of hybrid wire wireless formations – 4 units. 1) Solar Power Harvesting Unit(SOPHU) –Medium altitude 2)A Low Earth Orbit (LEO) Satellite. 3)Transmission Line Structure(TLS). 4)Power Collecting Base Station(PCBS). College Of Engineering Chengannur 13


SBSG The units 1 –> 3 – form long rigid space – based MEO-LEO formation. Solar harvesting cells – high altitudes – utilize – unfiltered energy of the sun. TLS – superconductive. Cyber signal processing – to support – operations 1)Handoff 2)Situation awareness 3)Multi satellite synchronization College Of Engineering Chengannur 14

Leo transmitters:

Leo transmitters Earth PCB’s – receives energy through at least – 1 LEO – directly/indirectly. Space – space signal transmission – efficient. Leo satellite B – not in the visibility zone – PCB – can transmit SOPHU B’s harvested energy to PCBs A through Leo satellite. College Of Engineering Chengannur 15

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Advantage.. Reduce launch expense – smaller harvesting units – at lower altitudes – still generates equivalent power. Decrease - challenge, cost of construction – size of antenna reflectors small. Increase power distribution - to more number of earth PCB’s. Transfer energy – to remote areas without using ground based power grids. College Of Engineering Chengannur 17


References IEEE – Aerospace Conference – 2011 - Space based power grids introduction: Feasibility Study Seyed A. (Reza) Zekavat, Ossama Abdelkhalik Michigan Technological University, Houghton. IEEE - Microwave Workshop Series on Innovative Wireless Power Transmission – 2011 - Wireless Power Transmission Technologies for Solar Power Satellite: 1)Susumu Sasaki, 2)Koji Tanaka, Advanced Mission Research Group. ad Astra: The Magazine Of The National Space Society. WIKIPEDIA.ORG College Of Engineering Chengannur 18


THANK YOU College Of Engineering Chengannur 19

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