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Gathering and Processing Photovoltaic Data at FEE CTU Prague
Martin Molhanec, M.Sc., Ph.D.
Department of Electrical TechnologyFaculty of Electrical Engineering
Czech Technical UniversityPrague, 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 poweroutput voltage, current and power of the converters total power delivered to the network temperature of convertors
Addition informationmomentary output power of PV fieldPV field temperature incident radiation intensity
PV panels
RS 422
RS 422
t °
DATA LOGGER
ADDITIONAL DATA
DISPLAY PANELS
USER
RS 232
CONVERTOR
DATA LOGGER
RS 232
ADDER DEVICE
RS 232
Old Connectivity
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.
PV panels
RS 422
RS 485
t °
DATA LOGGER
ADDITIONAL DATA
DISPLAY PANELS
USER
RS 232
CONVERTOR
RS 232
WEB SERVER
INTERNETIP CONNECTION
New connectivity.
CZREA
Czech RE AgencyRE = Renewable Energy
There is a cooperation between our department and CZREA.
They sponsor our new datalogger.
We send our data to him.
FVS 2300ECTU Prague
WEB SERVERCZREA
WEB SERVERCTU Prague
GET HTTP
GET HTTP
Scheme of Internet Connectivity
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
Czech Technical University in PragueFaculty of Electrical Engineering
Department of Electrical Technology
email: [email protected]://k313.feld.cvut.cz
http://martin.feld.cvut.cz/~molhanecThank you for your
attention!