The requirements of the communication systems were defined based on the applications that control the PV plant, and on the industry-standard IEC-61724-1 norm for PV data. After being developed, the communication systems were installed in a PV plant, and the interaction between the data obtained from these two systems is discussed and presented.
The PV plant application that makes the most use of the data provided by the station is the forecaster, since the forecast of the amount of energy that will be generated depends on meteorological parameters such as irradiance and wind speed.
Type and source of data: all real-time data from the PV/BESS plant. Modbus is an asynchronous communication protocol in which data are sent by the server only when requested by the client . Despite its age, the protocol is still widely used mainly due to its open license.
In small residential or commercial PV plants, it is practical to use the site's existing Ethernet network for data transmission, as demonstrated in . However, in larger centralized PV systems, it is advisable to install a dedicated transmission network for data, as shown in .
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