ComAp InteliMains NT IM-NT, Справочное руководство

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InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf,
©ComAp – April 2015
69
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
Reserve Actual Reserve Start condition Stop condition
Absolute
kW / kVA
ARstrt = ΣPg
Nom
– ΣPg
Act
ARstp = ΣPg*
Nom
– ΣPg
Act
ARstrt < #LoadResStrt ARstp > #LoadResStop
Relative
%
RRstrt = [(ΣPg
Nom
– ΣPg
Act
) /
ΣPg
Nom
].100%
RRstp = [(ΣPg*
Nom
– ΣPg
Act
) /
ΣPg*
Nom
].100%
RRstrt < #%LdResStrt RRstp > #%LdResStop
Case #2:

parallel to mains operation, ProcessControl: #SysLdCtrl PtM = BASELOAD
Reserve Actual Reserve Start condition Stop condition
Absolute
kW / kVA
ARstrt = ΣPg
Nom
– BaseLd
ARstp = ΣPg*
Nom
– BaseLd
ARstrt < #LoadResStrt ARstp > #LoadResStop
Relative
%
RRstrt = [(ΣPg
Nom
– BaseLd) / ΣPg
Nom
].100%
RRstp = [(ΣPg*
Nom
– BaseLd) / ΣPg*
Nom
].100%
RRstrt < #%LdResStrt RRstp > #%LdResStop
Where
ARstrt Actual Absolute reserve in kW or kVA - for engine start calculation.
ARstp Actual Absolute reserves in kW or kVA - for engine stop calculation.
RRstrt Actual Relative reserve in % - for engine start calculation.
RRstp Actual Relative reserves in % - for engine stop calculation.
ΣPg
Nom
Sum of Nominal power of all gen-sets on the bus.
ΣPg*
Nom
Sum of Nominal power of all gen-sets on the bus apart of the one, which is going to be
stopped.
ΣPg
Act
BaseLd
Sum of Actual power of all gen-sets on the bus = system load.
Baseload is given by the setpoint ProcessControl: #SysBaseLoad