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10 MV Station Functions
10.1
Operation Mode
10.1.1
Mode Change
After being energized, the MV Station switch among different modes as shown in the figure
below.
Startup
Standby
Emergency-
stop
All the grid-connected
requirements met
Idc
≈
0A for 10 minutes
Upv>UpvStart and setting
time reached
Fault
occurred
Stop the MV Station via LCD panel
Turn the Start/Stop switch to
“
Stop
”
or push down
the Emergency stop button
Run
Stop the MV Station via LCD panel
MV Station restarts
MV Station restarts
Turn the Start/Stop switch to
“
Stop
”
or
push down the Emergency stop button
Fault
Fault cleared and
setting time reached
Stop
Unrecoverable fault
Stop and repair the MV Station
Initial
standby
The MV Station is energized
Key-stop
Alarm Run
Alarm removed
Fig. 10-1
Operation modes change
Upv is the DC input voltage of the MV Station.
UpvStart is the MV Station DC side startup voltage.
10.1.2
Operation Mode Description
Stop
This is the initial state of the MV Station. The MV Station DC and AC switches are in the
“OFF” position; the upstream and downstream connections are disconnected. The MV
Station is therefore electricity-free.
Initial Standby
When the MV Station upstream and downstream connections are connected and the AC &
DC switches are in the “ON” position, the MV Station turns to the
Initial
Standby
mode.
The MV Station will continuously check if the PV array and the grid meet the
grid-connection requirements. If the MV Station DC input voltage is higher than the MV
Station startup voltage and the startup time is reached, whilst the requirements of the grid
side parameter are satisfied, MV Station will turn from the
Initial
Standby
mode into the
Startup
mode.
