Woodward GCP-30 Series User Manual

Manual 37365A GCP-30 Series Packages - Genset Control
Page 62/179 © Woodward
Variables
Generator rating
= the power rating for an individual generator (all generators used in this application must be of
the same power rating). "Rated power generator" (Parameter 21) should be configured as "200 kW".
Generat
or rating = 200 kW
Number of closed GCBs
= all generator that are used to calculate available generation power must have their cir-
cuit breaker closed.
Number of closed GCBs = varies
Desired mains interchange power level
= the power to be imported or exported to the mains
Imported power is always calculated as a negative number since the generator does not produce it. Exported
power always calculated as a positive number since the generator produces it. The desired import level should be
entered as "I0000 kW" for Automatic 1 or 2 (Parameter 35 or Parameter 36).
Desi
red mains interchange power level = 0 kW
Minimum load generator
= the minimum load that the first start request will be issued
"Minimum load generator" (Parameter 97) should be configured as "0030kW".
M
inimum load generator
= 30 kW
Generator hysteresis
= the power level that a stop command will be issued
This value is calculated by subtracting the minimum generator load for a shut down command to be issued from
the minimum load that a start command is issued. In this example the calculation would be [30 kW – 10 kW =
20 kW]. "Hysteresis add on / off op." (Parameter 100) should be configured as "20 kW".
Generator
hysteresis = 20 kW
Parallel reserve power
= the real load that a generator or generators are able to absorb while the next generator is
started. The reserve power is usually configured as the largest load swing that a power plant may encounter dur-
ing the time it takes to bring an additional generator online. "Reserve power mains op." (Parameter 101) should
be confi
gured as "40 kW".
Reserve power
= 40 kW
Monitored mains power
= the monitored power level and direction at the mains breaker
Case 3:
An engine start command is issued when the monitored mains power reaches a specified level. Formula C is used
as follows:
Desired mains interchange power level – Minimum load generator = Mains power level when generator starts
0 kW - 30 kW = -30 kW
The power supplied by the mains must be at equal to or greater than 30 kW in order for the GCP-30 to issue a
start command. After the engine starts and the GCB closes, the generator will assume load until the mains inter-
change is importing 0 kW.
Case 4:
An engine start command is issued to the second generator when the monitored mains power reaches a specified
level. Formula D is used as follows:
[(generator rating)(number of closed GCBs) – parallel reserve power] / number of closed GCBs = generator
power level at next start
[(200 kW)(1) – 40 kW] / 1 = 160 kW
The single generator that is providing power has a total load rating of 200 kW (200 kW x 1). This generator has
an available load of 160 kW (200 kW – 40 kW). When the individual generator load exceeds 160 kW, the next
generator will be started and brought online to share the load.

Woodward GCP-30 Series Specifications

General

Brand	Woodward
Model	GCP-30 Series
Category	Controller
Language	English