The 90MW GTGs are to operate in the DLN mode. The
40MW GTGs have just standard combustion. The 40MW GTG
shown in dotted lines indicates a machine in maintenance.
There is a connection to the local utility, the purpose of which
is to be able to import power during disturbances in order to
help keep the plant power system stable. The power system
can thus operate in the connected mode (utility circuits are
closed) or in the islanded mode (utility circuits are open). In
normal operation the exchange of active and reactive power
with the utility should be kept close to zero. The power system
is controlled by a PMS designed based on the concept of
robust control.