GCR0 pages

GCR
Digital power plant commander for generating sets
paralleled to the commercial power
GENERAL POINTS
The GCR is the fourth version designed by CRE. It allows the
synchronizing, the coupling, and the power control of one or several generating sets in parallel with one or several commercial
powers. It can be used with the synchronizers and load-sharing
modules from Barber Colman or Woodward and permits permanent or temporary paralleling.
The GCR is easily adjustable and congurable by its integrated
screen and keyboard, or by a PC through its serial port.

OPERATING MODES
The GCR offers two different operating modes of the generating
sets paralleled to the commercial power.
Constant generating set power : In this mode called system
1, the generating sets provide constant power. The commercial
power varies according to the load.

A09T0 /1 /2

FUNCTIONS
Automatic or manual paralleling :
In automatic or manual (via a potentiometer) mode, the GCR
controls the correction signals of all the generating sets by an
analog bus driving each regulation independently. The PID
synchronization performance is the same as synchronization
between generators.

Constant commercial power: In this mode, called System 2,
the commercial power (imported or exported) remains constant.
The generating sets power varies according to the load. The
commercial power is measured by a current input, +/-20mA or
4-20mA.

Loading and unloading ramps :
These ramps are separately adjustable for the systems 1 or 2
from 0sec to 30mn. These digital ramps are perfectly linear and
with a precision of 30ms. The transfer times are constant whatever the power to transfer (10s for 100KW = 10s for 1000KW).
Minimum and maximum power protections :
The low and high adjustable limits protect the generating sets
against underloads, reverse power and overloads.
Paralleling and power transfer with several commercial
power :
A memorization of the generating sets power allows to parallel
a power plant to several commercial power (one by one). Transfers (power plant/commercial power or commercial power/power
plant) is controlled without any power exchange between commercial powers and utilization. Two different +/- 20mA measurement inputs avoid to switch power measurements for transfers
when coupling and uncoupling power plant