ABB RELION REX640 - Governor and AVR mode control

9.6.5.3 Voltage and frequency matching
The operation of the Voltage and frequency matching module can be described with
a module diagram. All the modules in the diagram are explained in the next sections.
Matching for
own
generator CB
Matching for
network CB
Governor
and AVR
mode
control
MODE_GOV
MODE_AVR
DROOP_GOV
DROOP_AVR
DIFF_U_ASC1
DIFF_F_ASC1
ASC1_GEN_DAT
Voltage
matching
Frequency
matching
GOV_DROOP
AVR_DROOP
MOD_CHG_GOV
MOD_CHG_AVR
AVR_ALM_HI
AVR_ALM_LO
GOV_ALM_HI
GOV_ALM_LO
RAISE_U
LOWER_U
RAISE_F
LOWER_F
CL_COMMAND
BLOCK
ENERG_STATE From
Energizing check
MATCH_OK From
Synchronization check
and control
GEN_ASC_DATA
Figure 863: 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”.
1MRS759142 F
Control functions
REX640
Technical Manual
1569