166 Operating instructions
Manual Energy Storage Inverter ESI-S
9.3.3.2 Going to the islanding mode
When the unit connected to the network grid, the ESS is charging or discharging the
battery based on the request. If the user requests to switch to the islanding mode, it can
be done on the ESI-Manager:
−
Press
on the ESI-Manager repeatedly until the ‘Welcome’ screen is
displayed
−
Press the inverter ‘Settings’ menu .In this menu press on ‘BESS operation’
−
In this menu, the window shows the status of the system: ‘Unit connected to grid’.
Press on
to switch to the Islanding mode.
−
Once the system is in islanding the system status is : ‘Islanding: Unit is in islanding
state’
In case of voltage outage, the inverter will detect it and stop for safety reason. The user
or the main controller as to command the inverter to switch into islanding mode.
9.3.3.3 Working in islanding mode
When the inverter is in islanding mode, it is working as a voltage generator. The voltage
controls the magnitude of each phase separately. The current is generated as requested
by the loads/generation plants.
Active protections in islanding:
−
Linked to inverter:
•
Max. AC current: if the inverter reach a higher current than the nominal
value, the system stops.
•
Max THDV: if it is higher than 20% (at the inverter connection), the system
stops.
−
Linked to battery:
•
Max DC current: if the current flowing in the battery is higher than the
current allowed by the Battery Management System, the system stops.
•
Max/min State Of Charge (SOC): if the battery reach the limit max SOC and
the min SOC set during the commissioning, the system stops
•
Max/min voltages (battery and cell): if the battery reach the limits set
during the commissioning the system stops.
•
Max/min temperatures (battery and cell): if the battery reach the limits set
during the commissioning the system stops.
9.3.3.4 Resynchronization of the island
If the user or the main controller system is requesting to leave the islanding mode, the
inverter will resynchronize the island on the network voltage thanks to the voltage
measurement (see 1 on
). The resynchronization may take up to 20 sec.
