Source
selection
logic
.
.
.
.
U_DIFF
FR_DIFF
ASC_SRC1_DAT
AS_CONFLICT
ASC_NS1_DAT
ASC_SRC8_DAT
.
.
.
.
.
.
.
.
.
.
.
.
SRC1_ASC_DAT
NS1_ASC_DAT
SRC8_ASC_DAT
NS17_ASC_DAT
U_DIFF_1
FR_DIFF_1
U_DIFF_17
FR_DIFF_17
.
.
.
.
Voltage and
frequency
difference
logic
Topology info
From Topology determination
BLOCK
ASC_NS2_DAT
ASC_NS3_DAT
Figure 887: Module diagram of Coordinator
Voltage and frequency difference logic
This module sends the voltage and frequency difference values received from the
NSCB to be synchronized to all the sources with appropriate sign according to the
topology.
Of the two busbars connected across any NSCB, the voltage transformer
(VT) from the lower-number busbar should be connected to bus A
voltage channel (U_BUS_A) and the other to bus B voltage channel
(U_BUS_B).
If these VT connections are interchanged physically, then the correction can be
done in function using
NonSrc1 VT Conn
...
NonSrc17 VT Conn
for NSCB 1...NSCB 17.
When the coordinator is active and NSCB 1 is selected for synchronization, the
corresponding voltage and frequency difference inputs U_DIFF_1 and FR_DIFF_1
are available as outputs U_DIFF and FR_DIFF, respectively, with their sign adjusted
according to the setting
NonSrc1 VT Conn
. If set as "No Change", the sign of U_DIFF
and FR_DIFF remains the same. If set as "Reverse", the sign is reversed. Similarly,
when any of the NSCB 2...NSCB 17 is selected for synchronization, the corresponding
inputs U_DIFF_2...U_DIFF_17 and FR_DIFF_2...FR_DIFF_17 are passed as the
outputs U_DIFF and FR_DIFF, respectively.
The output AS_CONFLICT is active in any of the following conditions:
• If more than one NSCB are selected for synchronization at the same time.
• If a NSCB is selected for synchronization while source synchronization is in
progress.
• If more than one source are in synchronization.
When AS_CONFLICT is TRUE, then the Coordinator module stops the ongoing
coordination activities till a new synchronization request is received from any NSCB.
1MRS759142 F
Control functions
REX640
Technical Manual
1615
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