Manual 37278B GCP-30 Series - Genset Control
Page 58/174 © Woodward
Case 4:
Generator real power of each individual generator, at which the third engine is started:
P
GN.actual
> P
rated.tot
- (P
reserve.parallel
/ No. GCB)
- P
rated
.
P
GN.actual.
> 400 kW – (40 kW / 2) - 200 kW = 180 kW.
If the generator real power of both generators exceeds 360 kW (each generator supplies more than
180 kW), negative deviation from the pre-specified reserve power has occurred. As a result of this, the
next engine is started.
Case 5:
Generator real power of each individual generators, at which one engine is stopped:
P
GN.actual.tot
< P
rated.tot
- P
reserve.parallel
- P
rated
- P
hyst
.
P
GN.actual.tot
< 600 kW - 40 kW - 200 kW - 20 kW = 340 kW.
(P
GN.actual
< P
GN.actual.tot
)
/ No. GCB = 340 kW / 3 = 113.3 kW.
If the generator real power of the three generators falls below 340 kW (each individual generator below
113.3 kW), one engine is stopped. After one engine has been stopped, the reserve power is still available.
Case 5:
Generator real power of each individual generator, at which one of the two engines is stopped:
P
GN.actual.tot
< P
rated.tot
- P
reserve.parallel
- P
rated
- P
hyst
.
P
GN.actual.tot
< 400 kW - 40 kW - 200 kW - 20 kW = 140 kW.
(P
GN.actual
< P
GN.actual.tot
)
/ No. GCB = 140 kW / 2 = 70 kW.
If the generator real power of the two generators falls below 140 kW (each individual generator below
70 kW), one engine is stopped. After the engine has been stopped, the reserve power is still available.
Case 6
: Generator real power, at which the last engine is stopped:
P
GN.actual
< - P
NT.setpoint
+ P
NT.actual
+ P
start.gen
- P
hyst
.
P
GN.actual.
< - 0 kW + 0 kW + 30 kW - 20 kW = 10 kW.
If the generator falls below its minimum real power minus hysteresis, the engine is stopped. The power
imported from the mains therefore remains at the value that is to be controlled until just prior to stopping.
Following stopping, the power supplied by the mains increases to 10 kW.
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