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EN
SUNSYS PCS2 IM UL Power Conversion System and Storage with Islanding Mode from 33 to 200 kVA - Ref.: IOMSUNPCXX07-EN 01
8.2 CONVERTER STATE MACHINE
The SUNSYS PCS² IM implements the following state-machine concept:
INIT
SWITCHED-OFF
ALARM
SYSTEM READY
BLACK START
OFF-GRID MODE
ON-GRID MODE
ON / OFF
CHARGE / DISCHARGE
COMMAND
At system power-on by the auxiliary power supply, the SUNSYS PCS² IM automatically enters the
SWITCHED-OFF
status: the Control Panel shows the message SWITCHED-OFF on the Status line on the display and the luminous
status bar is switched-off.
An
ON
command connects the DC source to the SUNSYS PCS² IM and it enters the
SYSTEM READY
status, after
checking the battery conditions are satisfactory. On the control panel, the battery icon is green (or yellow if a Battery
Warning is present
(1)
) and the number of powered-on power modules appears.
The system can then operate in two modes, following two different paths:
• OFF-GRID MODE, operating in islanding conditions, as a grid-former;
• ON-GRID MODE, grid-tied and operating as a grid-follower.
From the SYSTEM READY status, a
BLACK START
procedure can be performed, in order to energise an isolated
micro-grid by the battery system. After the black start procedure has completed, the SUNSYS PCS² IM enters
OFF-GRID MODE
status, generating the proper voltage and frequency references for the micro-grid.
From the SYSTEM READY status, with a
Charge/Discharge
command, the SUNSYS PCS² IM synchronizes and
connects to the AC grid and enters
ON-GRID MODE
status. The SUNSYS PCS² IM follows P/Q references coming
from an external control device.
The direction of the power flow on the display shows the instantaneous charging/discharging operation. The
message INVERTER ON is displayed on the Status line on the display and the luminous status bar is switched-on
with a green or flashing yellow light (if at least one warning is present
(1)
).
Transitions from OFF-GRID MODE to ON-GRID MODE and vice versa are supported by the SUNSYS PCS² IM:
additional external devices and components shall be provided (e.g. synchronisation device, circuit breaker, measure-
ment system). Contact SOCOMEC for further information.
In the event of an alarm, the system enters
ALARM
status and switches-off to ensure conditions are safe. The lumi-
nous status bar is switched-on with a red light and an alarm message appears on the display panel.
1. A Warning does not cause the ESS to stop.