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Manual 37365A GCP-30 Series Packages - Genset Control

Mains parallel operation(mains interchange (import/export) real power control with multiple generators)

NOTE

The "desired mains interchange power level" will equal 0 in the formulas below if the breaker logic is

configured as Open Transition, Closed Transition, Interchange, or External. The desired mains inter-

change power level is utilized for import and export power operations.

General

Formula C: Start of the first generator

All GCBs are open.

The first engine is started when:

desired mains interchange power level – minimum load generator = mains power level when generator starts

Formula D: Starting of additional generators

At least one GCB in the group is closed.

The next engine is started when:

[(generator rating)(number of closed GCBs) – parallel reserve power] / number of closed GCBs = individual ge-

nerator power level at next start

Formula E: Stopping a generator

At least two GCBs in the group are closed.

An engine is stopped when:

(number of generators needed for load – 1)(generator rating) – parallel reserve power – generator hysteresis =

power level next generator stopped

Formula F: Stopping of the last generator

Only one GCB in the group is closed.

The last engine is stopped when:

[desired mains interchange power level + monitored mains power + minimum load generator – generator hyste-

resis = mains power level when generator stops

Example

When the generators are running the customer wishes to remain paralleled with the mains but does not want the

mains to supply any power to the system. This value has been configured as "I0000kW" (refer to "Real Power

ntroller, Set Point Values on page 37"). The same functionality may be achieved by configuring the main in-

terchange power as "E0000kW

". The largest load swing the system will encounter is 40 kW. The customer wants

a 20 kW buffer to prevent restarting of generators due to load swings. A reserve power for the system of 40 kW

and a generator hysteresis of 20 kW is desired for this application. The power plant consists of three generators

capable of paralleling. Each generator is rated for 200 kW of real power. It is not economical to start a generator

unless it will carry 30 kW of load.

Woodward GCP-30 Series User Manual

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