Transcript Photovoltaic Data Gathering and Processing at CTU Prague Martin

Photovoltaic Data
Gathering and Processing
at CTU Prague
Martin Molhanec, M.Sc., Ph.D.
Department of Electrical Technology
Faculty of Electrical Engineering
Czech Technical University
Prague, Czech Republic
Introduction
The departmental PV system FVS 2003A was
installed at 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
DATA LOGGER
RS 422
RS 232
CONVERTOR
ADDER DEVICE
DATA LOGGER
RS 232
RS 232
PV panels
USER
DISPLAY
PANELS
RS 422
ADDITIONAL
DATA
t°
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 directories 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.
DATA LOGGER
WEB
SERVER
INTERNET
IP CONNECTION
RS 422
RS 232
CONVERTOR
RS 232
PV panels
USER
RS 485
DISPLAY
PANELS
ADDITIONAL
DATA
t°
FVS 2300E
CTU Prague
GET HTTP
WEB SERVER
CZREA
GET HTTP
WEB SERVER
CTU Prague
Disadvantages of contemporary
solution
Dependency on CZREA web server.
Impossibility to easily change the
address of the target (receiver) web
server.
Impossibility to obtain historical data
from the data logger.
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.
Czech Technical University in Prague
Faculty of Electrical Engineering
Department of Electrical Technology
email: [email protected]
http://k313.feld.cvut.cz
http://martin.feld.cvut.cz/~molhanec
Thank you for your
attention! 