System Start; Operation Modes - ABB SureWave SFC User Manual

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11.1.1.3 Stopping
Stop unload - When configured to share with droop or running fixed P and Q then the system
will first unload the SFC and hand load off to other generators, prior to stopping the inverters
Stop ramp 0 - If stopping in from and Isochronous mode, the system will ramp the output volt-
age down to 0 prior to stopping the inverters.
Stop Inverters - Disconnects and stops the inverters
Stop rectifiers - Disconnects and stops the rectifiers
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System start

To start the SureWave SFC the incoming supply needs to be present and the rectifiers AC termi-
nals to be energized. Hence, the user has to check the system state e.g., confirming input volt-
age is at required levels through the GDM.
Once the input voltage is within nominal conditions and no faults are present, the system can be
started via three sources:

GDM – Via "Dashboard" page, the SFC can be started with the press of one button.

Digital I/O – the SFC can be started after the "Start" digital signals is received.

Modbus TCP – The SFC can be started after the "Start" command is received.
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Operation modes

The SureWave SFC may have its output frequency and voltage controlled independently in a
number of different ways, depending on the application.

Stand-alone applications without any other generation equipment connected to the
load. This typically require the output frequency and voltage to be fixed.

Applications with a generator connected in parallel with the SureWave. This typically re-
quire the SFC to control its real power output by adjusting its output frequency. This
enables seamless handover of load between generator and the SureWave SFC.

Applications with more than one SureWave SFC in parallel to cover larger loads. Gener-
ally, the load sharing is successfully achieved by applying droop to the SureWave SFC
output voltage.
11.3.1 Stand-alone (VSI) operation mode
11.3.1.1 VSI-V/F
This mode is typically used when the SFC either stands alone or is the largest unit on a grid. In
this mode, the voltage and frequency are regulated very tightly in reaction to load changes.
SUREWAVE SFC USER MANUAL