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 2(“Fixed MW’), respectively. If the command parameter
AVR mode change
is set
to "Droop" or "Fixed MVAr", the function activates the binary output AVR_DROOP and
sets integer output MOD_CHG_AVR to 9(“Droop”) or 11(“Fixed MVAr”), respectively.
Matching for own generator CB
If the command ‘Synchronize CB’ is set to “TRUE” or input CL_COMMAND is TRUE, the
generator CB is selected for synchronizing. For the voltage and frequency matching
to start, the generator CB should be in open position and
Synchrocheck mode
should be set to "Asynchronous".
The measured voltage difference U_DIFF_MEAS is used for generating AVR raise
or lower pulses to match the voltages across the CB. The measured frequency
difference FR_DIFF_MEAS is used for generating governor raise or lower pulses to
match the frequencies across the CB. The voltage and frequency matching starts
only when the ENERG_STATE is “Both Live”.
Voltage difference (ΔU) = U_DIFF_MEAS
Frequency difference (ΔF) = FR_DIFF_MEAS
Matching for network CB
The generator is ready for network CB matching only when the generator CB is
closed, the protection relay is in remote mode and the generator is requested for
matching from non-source function.
After receiving the acknowledgement from ASGCSYN, the autosynchronizer
coordinator function ASCGAPC gives permission to participate in the voltage and
frequency matching across the CB to be synchronized in the network. ASCGAPC
also shares the information about how many generators participate in the voltage
matching (NgV) and frequency matching (NgF). Depending on the number of
participating generators, the voltage and frequency difference is divided among
the generators.
The voltage and frequency difference calculated for generating raise or lower pulses
for AVR and governor are
Voltage difference (ΔU) = DIFF_U_ASC1 / NgV
Frequency difference (ΔF) = DIFF_F_ASC1 / NgF
The sign bit for voltage difference and frequency difference is decided based on
the data received from ASCGAPC. The calculated voltage difference and frequency
difference are available in the Monitored data view U_DIFF_NTW and FR_DIFF_NTW,
respectively.
Control functions
1MRS759142 F
1570 REX640
Technical Manual
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