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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 Martin Molhanec, M.Sc., Ph.D. Department of Electrical Technology Faculty of Electrical EngineeringCzech Technical University Prague, Czech Republic
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.
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
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.
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.
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.
A temporary solution • The main disadvantages • Poor software implementation and tools instability. • Not fully automated process. • Problematic expansibility and modification.
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.
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.
Daily Dataof Voltage A Detail
Daily Dataof Current A Detail
Daily Data DetailedTextOutput
Daily Data DetailedTextOutput
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.
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
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!