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PHOTOVOLTAIC APPLICATIONS

PHOTOVOLTAIC APPLICATIONS. Jiyeon HYUN. What is photovoltaic ?. Photovoltaics are best known as a method for generating electric power by using solar cells to convert energy from the sun into a flow of electrons. Disadvantages. Advantages.

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PHOTOVOLTAIC APPLICATIONS

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  1. PHOTOVOLTAIC APPLICATIONS Jiyeon HYUN

  2. What is photovoltaic ? • Photovoltaics are best known as a method for generating electric power by using solar cells to convert energy from the sun into a flow of electrons.

  3. Disadvantages Advantages • the highest power density among renewable energies • It can be used for long time. (40years) • Reduce pollution • Wide places is needed. • Initial cost is high

  4. Principal

  5. principal • N type of silicon / P type of silicon - silicon has for valence electrons, all of which are normally part of bonds in a silicon crystal. - an atom such as phosphorus, having five valence electrons. (n type) - An impurity atom with three valence electrons (such as boron) would sit in the position of the original silicon atom (p type)

  6. principal

  7. principal

  8. principal • Light incident on the cell creates electron-hole pairs, which are separated by the potential barrier, creating a voltage that drives a current through an external circuit.

  9. PV system types • GRID-TIE (BATTERY FREE) • GRID-TIE WITH BATTERY BACKUP • STAND-ALONE • PV DIRECT

  10. GRID-TIE (BATTERY FREE) This system does not provide backup power during a power outage (even if the sun is shining) but for sites with reliable grid power, this is usually the logical system choice.

  11. GRID-TIE WITH BATTERY BACKUP It can also push excess electricity produced to the electric utility grid but has the added feature of batteries in order to power some selected backup loads when the grid is down.

  12. STAND-ALONE The Off-Grid or Stand-Alone PV System incorporates large amounts of battery storage to provide power for a certain number of days (and nights) in a row when sun is not available.

  13. PV DIRECT PV Direct systems are usually very simple systems where the photovoltaic panel is connected directly to a motor or pump which matches the voltage and amperage output of the panel.

  14. conference • http://en.wikipedia.org/wiki/Photovoltaics • http://www.nrel.gov/docs/legosti/old/1448.pdf • http://blog.naver.com/kunastory?Redirect=Log&logNo=120616879 • http://www.aladdinsolar.com/pvsystems.html

  15. Thank you

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