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Gathering and Processing Photovoltaic Data at FEE CTU Prague

Gathering and Processing Photovoltaic Data at FEE CTU Prague. Martin Molhanec, M.Sc., Ph.D. Department of Electrical Technology Faculty of Electrical Engineering Czech Technical University Prague, Czech Republic. Introduction.

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Gathering and Processing Photovoltaic Data at FEE CTU Prague

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  1. Gathering and Processing Photovoltaic Data at FEE CTU Prague Martin Molhanec, M.Sc., Ph.D. Department of Electrical Technology Faculty of Electrical EngineeringCzech Technical University Prague, Czech Republic

  2. Introduction • The departmental PV system FVS 2003A was installed in 2002 year on the roof of our faculty. • The system is build up from 3 independent subsystems (@1kW). • Each subsystem consists of 10 PV panels. • The PV system is connected to the standard 230V, 50 Hz power supply network. • All produced energy is consumed at faculty building.

  3. Introduction • Following data are collected from every PV subsystem • PV field output voltage, current and power • output voltage, current and power of the converters • total power delivered to the network • temperature of convertors • Addition information • momentary output power of PV field • PV field temperature • incident radiation intensity

  4. Old Connectivity

  5. Output from presentation panel in vestibule.

  6. This solution has many disadvantages • PVDA can be processed only manual way by special programme from PV system supplier and this process can not be automated. • The collected data can be only manually processed for subsequent utilization. • The web presentation of PV data is created manually. This solution necessitates a good knowledge of HTML and web pages development. A direct access to the web server folders is also required.

  7. A temporary solution • Created at 2005 year as a result of diploma thesis. • A better integration with the faculty network cabling system. • An easier possibility of moving data output of the PV system from one office to another office on the same corridor. • Standardized output of cabling by commonly used twist pair network jacks. • Direct connectivity to the web server room. • The second cabling system was prepared for future IP based method of data acquisition.

  8. A temporary solution • The web presentation was created by the following scenario • Getting data from data logger by standard supplier’s tool. • Sending preserved data from a client workstation by a special tool up to the web server directory. • Automated on server processing of received data into the database located on the web server. • And finally, a presentation of stored PV data on web server pages.

  9. A temporary solution • The main disadvantages • Poor software implementation and tools instability. • Not fully automated process. • Problematic expansibility and modification.

  10. Old web pages.

  11. Present time solution • Towards the end of the 2005 year was installed a new data logger with standard (RS485/RS422) and a new IP (Internet) based connectivity. • The works on the new automated graphical presentation and processing of PV data in the context of our new Internet based connectivity are in progress.

  12. New connectivity.

  13. CZREA • Czech RE Agency • RE = Renewable Energy • There is a cooperation between our department and CZREA. • They sponsor our new datalogger. • We send our data to him.

  14. Scheme of Internet Connectivity

  15. The CZREA page with data from CTU.

  16. Daily Dataof Energy

  17. Daily Dataof IRRAD

  18. Daily Dataof PAC

  19. Daily Dataof Temperature

  20. Daily Dataof Voltage

  21. Daily Dataof Voltage A Detail

  22. Daily Dataof Current

  23. Daily Dataof Current A Detail

  24. Daily Data DetailedTextOutput

  25. Daily Data DetailedTextOutput

  26. Monthly DataAccumulatedEnergy

  27. Early DataAccumulatedEnergy

  28. Disadvantages of contemporary solution • Dependency on CZREA web server. • But cooperation is very good. • Impossibility to easily change the address of the target (receiver) web server. • But this is not needed frequently. • Impossibility to obtain historical data from the data logger. • We must look for alternative solution.

  29. FUTURE AND IDEAS • Firstly we want to complete our Internet based PV data acquisition project and create a comfortable presentation of collected PV data on our departmental web server pages. • A farther objective is an integration of processing of our PV data with meteorological data collected by the Department of Telecommunications Engineering. • Our strategic goal is to create a complex information system about the photovoltaic education, e-learning and research. http://andrea.feld.cvut.cz/fvs

  30. Martin Molhanec Czech Technical University in Prague Faculty of Electrical Engineering Department of Electrical Technology email: molhanec@fel.cvut.cz http://k313.feld.cvut.cz http://martin.feld.cvut.cz/~molhanec Thank you for your attention!

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