ABB RELION REX640 Technical Manual page 1418

Section 9
Control functions
1412
MODE_GOV
MODE_AVR
Governor
DROOP_GOV
DROOP_AVR
AVR_ALM_HI
AVR_ALM_LO
BLOCK
ENERG_STATE From
Energizing check
CL_COMMAND
generator CB
ASC1_GEN_DAT
DIFF_U_ASC1
DIFF_F_ASC1
Matching for
GOV_ALM_HI
GOV_ALM_LO
MATCH_OK From
Synchronization check
and control
GUID-54453338-512A-40BD-9F83-077854A58409 V1 EN
Figure 759: Module diagram for Voltage and frequency matching
The voltage and frequency matching is activated automatically during the
"Autosynchronization" mode.
Governor and AVR mode control
If the setting Central PMS present is set to "Yes", then the governor and AVR mode
is decided based on the inputs MODE_GOV and MODE_AVR, respectively. If the setting
Central PMS present is set to "No", then the governor and AVR mode is decided based
on the inputs DROOP_GOV and DROOP_AVR, respectively.
For the matching of frequency and voltage, the governor or AVR mode must be
1("Droop") or 2("Fixed MW'). Otherwise, the MOD_CHG_GOV or MOD_CHG_AVR
output is used for the mode change request.
When the setting Central PMS present is set to "Yes" and the Governor or AVR mode
is not 1("Droop") or 2("Fixed MW'), then the function sets MOD_CHG_GOV or
MOD_CHG_AVR output to ("Droop") or ("Fixed MW'). Otherwise, the function sets
MOD_CHG_GOV or MOD_CHG_AVR output to "No change".
When the setting Central PMS present is set to "No" and the Governor or AVR mode
is not Droop mode, then the function activates the binary output GOV_DROOP or
AVR_DROOP by using the input DROOP_GOV or DROOP_AVR.
The governor and AVR modes can also be changed through the command parameters
Gov mode change and AVR mode change, respectively. If the command parameter
Gov mode change is set to "Droop" or "Fixed MW", the function activates the binary
output GOV_DROOP and sets integer output MOD_CHG_GOV to 1("Droop") or
and AVR
mode
control
Voltage
matching
Matching for
own
network CB
Frequency
matching
1MRS759142 C
GOV_DROOP
AVR_DROOP
MOD_CHG_GOV
MOD_CHG_AVR
RAISE_U
LOWER_U
GEN_ASC_DATA
RAISE_F
LOWER_F
Technical Manual
REX640