|
 CONTROL OF PHOTOVOLTAIC SYSTEMS: NETWORK
EXAMPLE.
Monitoring
and supervision of the proper functioning of photovoltaic systems in a
more or less detail and taking into account their size is very
important.
For
a small system the trend is to monitor the daily downstream production
of the system while the average of large plants is also pushing to
monitor continuously the production of individual strings to detect any
anomalies, for example you can prepare the system to generate an alarm
in case of attempted theft of the panels.
In
the above Electrex’s network example are included: FEMTO D4
DC for each string to measure the current through
a shunt and the voltage through a VOLTAGE
DIVIDER. Then there are a YOCTO I-O
that stores the pattern of light and temperature and a X3M D6 H
which stores the total downstream production of the meter and allow to
assess the quality of energy (harmonics, micro interruption, and so on).
Daily graph of solar
irradiation
All these tools are then linked together
in a RS485 network up to a YOCTO
NET LOG 16 which in this case has been enhanced
to perform different features.
The first feature is to memorize the
curves of production periodically looking at the average power of each FEMTO D4
DC.
Daily graph of the
produced energy
The
second feature is to interface with the PC, directly or through an
Ethernet hub or through Internet
(if is assigned a static IP address). ENERGY
BRAIN (software) is available for download, store
and display the data collected by the YOCTO
NET LOG 16, the YOCTO
I-O and from the X3M D6 H
on your personal computer.
The
third feature, enabled by UPGRADE
WEB, is to allow the display of Web pages with
preset measures snapshots of all devices connected to YOCTO
NET LOG 16.
The
fourth feature, enabled by UPGRADE
OPEN WEB allows you to upload in the web server
of the YOCTO
NET LOG 16 personalized Web pages (such as a
synopsis of the plant with the logo of the customer to get publicity)
and through an Internet connection can be viewed with any browser by
all those who are authorized.
Web pages of the YOCTO
NET LOG
The
fifth function, the alarm and alert ones assisted by YOCTO
GATE (GSM multifunctional gateway), for example,
allows you to send an email alert in case of theft of a panel, as well
as send an SMS alert to multiple people, it can activate an acoustic
alarm and / or turn on the lights of the monitored area, and so on.
The proposed system is then further
expandable according to the customer needs.
|
