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How does the control center communicate with the PV system?

The control center communicates with the PV system by a Modbus protocol and with the BESS by IEC 61850. The IEC 61850 data structures provided by the BESS were created beforehand by a configuration file. Fig. 5 presents a schematic of this structure. Fig. 5. use case “meeting the supply forecast”. 5.1. Constraints on implementation

Can a Bess be used with a battery energy storage system?

Measurements of battery energy storage system in conjunction with the PV system. Even though a few additions have to be made, the standard IEC 61850 is suited for use with a BESS. Since they restrict neither operation nor communication with the battery, these modifications can be implemented in compliance with the standard.

How is a PV system simulated?

The PV system is simulated on another PC system by a Modbus slave. A Modbus slave represents a server that supplies data through retrievable registers. The control center uses a Modbus TCP connection to query the system's current active power in regular intervals and compares this with the forecast's values, which are saved locally in the system.

How does a battery system work?

This is done by three systems: The Energy Management System (EMS) monitors grid demand and how the required energy can be transferred from the BESS. This is done through control logic. The EMS sends an input signal to either charge or discharge the battery based on the control logic requirement and the SOC of the battery system.

How does a battery energy storage system work?

Battery Energy Storage Systems (BESS) store energy during times of high production/low demand and then discharge it during times of low production/high demand. Like any energy source at a solar PV plant, BESS must be monitored and controlled. This is done by three systems:

When can large quantities of electricity be stored and retrieved?

Large quantities of generated electricity can be stored and retrieved anytime too little power is produced . Such a scenario can only be implemented when data is exchanged properly among a BESS, PV system and control system .