Power Plant Configuration (Several Generating Sets In Parallel) - SDMO R 340 U User And Maintenance Manual

6.3.4.4.

Power plant configuration (Several generating sets in parallel)

Without common part and without Normal/Emergency inverter (A632)
This configuration is designed to provide:
Emergency electricity supply to an installation following a grid loss (The grid loss is not controlled by Kerys). Return to the
grid will be achieved by Normal / Emergency switchover by means of a self-driven inverter (not controlled by Kerys).
FORCED OPERATION with a generating set.
Operation in "Effacement Jour de Pointe" (EJP)* mode or other rates.(Information transmitted by dry contacts).
An active power regulation (speed of the generating sets) by parallel lines connected between all the regulation modules.
Genset 1
M
(*) the "EJP" (Peak Day Load Shedding) system is specific to the French power grid.
Note 1: In this operating mode there is no reactive power regulation (generating set voltage); the generating sets are static.
Note 2: In an installation of the power station type (several generating sets in parallel) two modes of coupling between generating
sets are possible
• Coupling when stopped.
• Coupling in normal operation.
Principle of coupling when stopped
-
all the generating set power units are switched off,
-
starting of all the generating sets,
- when the speed reaches 1450 rpm, activated excitation command on all the generating sets,
- the voltage generated by each generating set increases gradually and the voltage is therefore the same in all
generating sets,
- the generating sets therefore reach 1500 rpm at 400 V 50 Hz.
At the end of global operation, if the power consumed by the installation does not require the operation of all the
generating sets within the power plant, one or more generating sets will be stopped according to the wattmetric control.
Restarting of the generating set (these generating sets) depends on the load and wattmetric control of the load.
However, if a generating set is reconnected to a busbar already subjected to a load, the "recoupling" is carried out in
normal operation and not when the generating set is stopped.
3PH
Parallel line
Regulation
module
3PH + N
Base
module
3PH 3PH
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Genset 2
3PH
Regulation
module
M
Base
module
3PH + N
Genset x