Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 92/190 © Woodward
Mains Parallel Operation(Mains Interchange (Import/Export) Real Power Control with Several
Generators)
General
Case 3: Start of the first engine
All GCBs are open.
If [P
NT.setpoint
- P
NT.actual
> P
start
] the first engine is started. (c)
Case 4: Starting of additional engines
At least one GCB in the group is closed.
If [P
GN.actual.tot
+ P
reserve.parallel
> P
rated.tot
] the next engine is started. (d)
Case 5: Stopping
At least two GCB's in the group are closed.
If [P
GN.act.tot
+ P
reserve.parallel
+ P
hyst
+ P
rated
< P
rated.tot
] a engine is stopped. (e)
Case 6: Stopping of the last engine
Only one GCB in the group is closed.
If [P
NT.setpoint
- P
NT.actual
+ P
GN.actual.tot
< P
start
- P
hyst
] the last engine is stopped. (f)
Example
The real power supplied by the mains, which is to be adjusted, is 0 kW. This value is entered as the set point
value (see chapter "Controllers") as "I0000kW" (corresponds to "E0000kW"). The reserve power in the system
should be 40 kW. The power hysteresis should be 20 kW. Three generators are to be operated within the group.
The rated power of a generator is 200 kW. The minimum power of a generator should be 30 kW.
P
Rated
= 200 kW Rated power of a generator.
P
Rated.tot
Total of the rated power values of the gensets with closed GCB's.
P
Start.tot
= 30 kW Minimum power of a generator.
P
NT.actual
Current mains power.
P
NT.setpoint
= B0000 kW Set point mains power
P
Reserve.Parallel
= 40 kW Reserve power in mains parallel operation
P
Hyst
= 20 kW Power hysteresis
No. GCB Number of closed GCB's
Case 3:
Power supplied by the mains, with which the first engine is started:
P
NT.actual
< P
NT.setpoint
- P
start.gen
.
P
NT.actual
< 0 kW - 30 kW = -30 kW ⇒ I0030 kW.
The power supplied by the mains must be at least 30 kW in order for the first engine to start. This is then
operated with a minimum power of 30 kW.
Case 4:
Generator real power, at which the second engine is started:
P
GN.actual
> P
rated.tot
- (P
Reserve.Parallel
/ No. GCB).
P
GN.actual
> 200 kW – (40 kW / 1) = 160 kW.
If the generator real power exceeds 160 kW, negative deviation from the pre-specified reserve power has
occurred. As a result of this, the next engine is started.
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

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English