Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 94/190 © Woodward
Isolated Operation in Parallel with Other Generators
The load-dependent start/stop function is activated for every control when the following criteria has been met:
• the operation mode AUTOMATIC has been selected
• all parameters, such as start power (
Parameter 84), stop power (Parameter 87), start delay (Parameter 85),
stop delay (
Parameter 86) and the frequency set point values (Parameter 6) are identical for all controls in-
volved
• one or both parameters "Load-dependent stop/start on terminal 3/5" (
Parameter 82 or Parameter 83) has/have
been configured to "ON"
• the parameters "Load sharing" (
Parameter 77) or "var sharing" (Parameter 79) have been configured as "ON"
• All generators are configured to the same rated power (
Parameter 17)
NOTE
The reserve power (Parameter 90) should be selected in such a manner that expected load swings will
not overload the generator.
Parameter 90
Reserve power
isol. op. 0000kW
Load dependent start/stop: reserve power (isolated operation) 0 to 999 kW
Starting of an additional engine is determined via the reserve power. The reserve
power results from the currently available total generator rated real power (genera-
tor rated real power × number of closed GCB's) and the currently available total
generator actual real power. If the currently available total generator actual real
power is subtracted from the currently available total generator rated real power,
this results in the system's reserve power. If negative deviation from this reserve
power occurs, the next engine is started.
Currently available total generator rated real power
- Currently available total generator actual real power
= Reserve power
Parameter 91
Add-on delay
isol. op. 000s
Load dependent start/stop: start delay (isolated operation) 0 to 999 s
Starting may be delayed even if the engine's start power (Parameter 84) has been
reached. In order to avoid starting the engine in the event of short-term load
swings, a start delay may be entered in seconds. The start power (
Parameter 84)
must therefore be present without interruption during this period of time, in order
to ensure that the engine is started. If the load drops below the set start power limit
before the time configured here expires, the counter is reset to 0.
Parameter 92
Stopdelay
isol. op. 000s
Load dependent start/stop: stop delay (isolated operation) 0 to 999 s
Stopping can be delayed even if the engine's stop power (Parameter 87) has been
reached. In order to avoid shutting the engine down in the event of short-term load
swings, a stop delay may be entered in seconds. The stop power (
Parameter 87)
must therefore be present without interruption during this period of time, in order
to ensure that the engine is stopped. If the load rises above the set stop power limit
before the time configured here expires, the counter is reset to 0.
General
Case 7: Start of the engine
If [P
GN.actual.tot
+ P
reserve.isolated
+ > P
rated.tot
] the engine is started. (f)
Case 8: Stop of the engine
If [P
GN.actual.tot
+ P
reserve.isolated
+ P
hyst
+ P
rated
+ < P
rated.tot
] the engine is stopped. (g)
Example

Woodward GCP-20 Series Specifications

General

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