Woodward GCP-30 Series User Manual

Manual 37365A GCP-30 Series Packages - Genset Control
© Woodward Page 53/179
Load and/or var Sharing
The GCP-30 performs proportional load and/or var sharing. This means each generator will share the load at the
same percentage level of the generator rated power when paralleled against the mains, in an isolated operation
with multiple generators paralleled, or when re-synchronizing the common bus to the mains. Proportional
load/var sharing will not be performed when the GCP-30 has the GCB closed and is in the constant power/base
load mode. The GCP-30 is capable of controlling up to 14 generators. The GCP-30 is also capable of controlling
any generator rated up to 10 MW. The total rated system power for all generators may not exceed 32 MW.
Mains parallel operation with mains interchange real power control (import/export): The GCP-30 control-
lers maintain the real load level on the individually controlled generators at a level so that the real power set point
at the mains interchange remains at the configured set point. The real power set point for the mains interchange
must be configured identically for each GCP.
The GCP-30 controller communicates with other controls in the system via a CAN bus. This enables the control-
lers to adjust the real power generated by the generator while remaining within the rated power of the generator.
A smaller generator will contribute less real power as compared to a large generator, but they will both be uti-
lized to the same capacity factor. An example of this would be a 100 kW generator with a configured 1000 kW
generator and a mains interchange of 825 kW. The 100 kW generator would contribute 75 kW and the 1000 kW
generator would contribute 750 kW or both generators would be at 75% of their rated capacity.
Reactive load sharing is not performed when operating in parallel with the mains. The reactive power control
will be defined by the configured power factor set point of the individual controllers. If "Pow.fact.contr. setpoint"
(
Parameter 68) is configured as i0.95, the GCP will proportionally share the real load with all generators in paral-
l
el with the mains while controlling the reactive power at a 0.95 lagging power factor regardless of the what
power factor the mains is operating at.
The parameter "kW/kvar sharing: reference variable kW" (Parameter 91) can be used now to define the priority
of the real power sharing reference vari
able (real power at interchange). A higher configured percentage influ-
ences the control more towards maintaining the real power set point for the interchange. A lower configured per-
centage influences the control more towards maintaining real power sharing between units.
The parameter "kW/kvar sharing: reference variable kvar" (Parameter 93) has no influence here.
Iso
lated operation in parallel: The GCP-30 controllers maintain the voltage and frequency of the individually
controlled generators at a constant level. This makes it imperative that the voltage and frequency set points are
configured identically for each GCP.
The GCP-30 controller communicates with other controls in the system via a CAN bus. This enables the control-
lers to adjust the real power generated by the generator while remaining within the rated power of the generator.
A smaller generator will contribute less real power as compared to a large generator, but they will both be uti-
lized to the same capacity factor. An example of this would be a 100 kW generator and a 1000 kW generator
with an 825 kW load. The 100 kW generator would contribute 75 kW and the 1000 kW generator would contri-
bute 750 kW or both generators would be at 75% of their rated capacity.
The reactive power will be shared proportionally among all generators involved.
The parameter "kW/kvar sharing: reference variable kW" (Parameter 91) can be used to define the priority of the
reference vari
able for real power sharing. A higher configured percentage influences the control more towards
frequency control. A lower configured percentage influences the control more towards real power sharing.
The parameter "kW/kvar sharing: reference variable kvar" (Parameter 93) can be used now to define the priority
of the reference variable for reactive power sharing. A higher confi
gured percentage influences the control more
towards voltage control. A lower configured percentage influences the control more towards reactive power shar-
ing.

Woodward GCP-30 Series Specifications

General

Brand	Woodward
Model	GCP-30 Series
Category	Controller
Language	English