Data Collection In Large Pv Systems - Phoenix Contact SCK-C-MODBUS User Manual

105608_en_00
2.2

Data collection in large PV systems

Weather Station
StringBox
StringBox
PV Plant
Energy
Data
Figure 2-8

Data collection in large PV systems

Data collection in large, extensive PV systems presents a challenge with regard to the net-
work technology. On the one hand, the reliable assignment of data and data security must
be implemented well; on the other hand, the hardware design needs to be inexpensive and
straightforward. This is particularly relevant in the special electrical environment of a PV
power station.
Although the PV generator generates a direct current in principle, the inverters in the system
likewise have an impact on the power cables. This means that in a PV system, the inverter's
method of operation generates AC voltage components on the DC side. This may lead to
inductive interference of cables and devices in the proximity of the generator's DC cabling.
Depending on the inverter type and connection, the effect of these AC voltage components
can vary.
In order to avoid any influence on signals and data cables, corresponding standards regard-
ing the installation of data cables in the vicinity of power cables must be observed. Standard
DIN EN 50174 provides comprehensive guidelines on planning and installing communica-
tion cables in the vicinity of power cables.
General notes on PV systems
Data Storage
Internet
Signal conditioning
(PLC Function)
Local Visu
Inverter Station
Main cabinet
Remote Visu
Infrastructure
15
PHOENIX CONTACT