Gathering and Processing Photovoltaic Data at FEE CTU Prague

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 (_at_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
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
Old Connectivity
8
Output from presentation panel in vestibule.
9
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.

10
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.

11
A temporary solution

• The web presentation was created by the following
  scenario
• Getting data from data logger by standard
  suppliers 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.

12
A temporary solution

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

13
Old web pages.
14
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.

15
New connectivity.
16
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.

17
Scheme of Internet Connectivity
18
The CZREA page with data from CTU.
19
Daily Dataof Energy
20
Daily Dataof IRRAD
21
Daily Dataof PAC
22
Daily Dataof Temperature
23
Daily Dataof Voltage
24
Daily Dataof Voltage A Detail
25
Daily Dataof Current
26
Daily Dataof Current A Detail
27
Daily Data DetailedTextOutput
28
Daily Data DetailedTextOutput
29
Monthly DataAccumulatedEnergy
30
Early DataAccumulatedEnergy
31
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.

32
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
33
Martin Molhanec
Czech Technical University in Prague Faculty of
Electrical Engineering Department of Electrical
Technology
email molhanec_at_fel.cvut.cz http//k313.feld.cvut.
cz http//martin.feld.cvut.cz/molhanec
Thank you for your attention! ?