InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf, ©ComAp – April 2015
7.6.2.2 Load reserve
The power management is based on the load reserve concept. The load reserve is defined as
a difference of the running nominal power of the group within power management and the total load of
the system. There are two ways how to determine the load reserve. The absolute power management
allows the system to keep the load reserve higher or equal to value in kW or kVA given by a relevant
setpoint. The relative power management assures that load reserve is kept higher or equal to relative
portion in % of the nominal power of group (i.e. running gen-sets active in power management) given
by a relevant set-point. Depending of the situation, load reserves are calculated differently in two
cases:
Case #1:
island operation
or parallel to mains operation, ProcessControl: #SysLdCtrl PtM = LDSHARING
ARstrt = ΣPg
Nom
– ΣPg
Act
ARstp = ΣPg*
Nom
– ΣPg
Act
RRstrt = [(ΣPg
Nom
– ΣPg
Act
) / ΣPg
Nom
].100%
RRstp = [(ΣPg*
Nom
– ΣPg
Act
) / ΣPg*
Nom
].100%
Case #2:
parallel to mains operation, ProcessControl: #SysLdCtrl PtM = BASELOAD
ARstrt = ΣPg
Nom
– BaseLd
ARstp = ΣPg*
Nom
– BaseLd
RRstrt = [(ΣPg
Nom
– BaseLd) / ΣPg
Nom
].100%
RRstp = [(ΣPg*
Nom
– BaseLd) / ΣPg*
Nom
].100%
Where
Actual Absolute reserve in kW or kVA - for engine start calculation.
Actual Absolute reserves in kW or kVA - for engine stop calculation.
Actual Relative reserve in % - for engine start calculation.
Actual Relative reserves in % - for engine stop calculation.
Sum of Nominal power of all gen-sets on the bus.
Sum of Nominal power of all gen-sets on the bus apart of the one, which is going to be
stopped.
Sum of Actual power of all gen-sets on the bus = system load.
Baseload is given by the setpoint ProcessControl: #SysBaseLoad
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